diff --git a/CMakeLists.txt b/CMakeLists.txt
index b6b5192..b59673d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -206,6 +206,9 @@ set(VMIX_SRCS
     Primitives.cpp
     Mesh.cpp
     SessionVisitor.cpp
+    View.cpp
+    Source.cpp
+    Mixer.cpp
     Settings.cpp
     Screenshot.cpp
     Resource.cpp
diff --git a/FrameBuffer.cpp b/FrameBuffer.cpp
index 7cae562..6ca98c7 100644
--- a/FrameBuffer.cpp
+++ b/FrameBuffer.cpp
@@ -1,22 +1,26 @@
 #include "FrameBuffer.h"
 #include "ImageShader.h"
+#include "Resource.h"
 #include "Log.h"
 
 
 #include <glad/glad.h>
 
-FrameBuffer::FrameBuffer(uint width, uint height, bool useDepthBuffer)
+FrameBuffer::FrameBuffer(uint width, uint height, bool useDepthBuffer): textureid_(0), framebufferid_(0), usedepth_(useDepthBuffer)
 {
     attrib_.viewport.x = width;
     attrib_.viewport.y = height;
     attrib_.clear_color = glm::vec3(0.f);
+}
 
+void FrameBuffer::init()
+{
     // create a renderbuffer object to store depth info
     GLuint rboId;
-    if (useDepthBuffer){
+    if (usedepth_){
         glGenRenderbuffers(1, &rboId);
         glBindRenderbuffer(GL_RENDERBUFFER, rboId);
-        glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT,  width, height);
+        glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, attrib_.viewport.x, attrib_.viewport.y);
         glBindRenderbuffer(GL_RENDERBUFFER, 0);
     }
 
@@ -27,7 +31,7 @@ FrameBuffer::FrameBuffer(uint width, uint height, bool useDepthBuffer)
     // generate texture
     glGenTextures(1, &textureid_);
     glBindTexture(GL_TEXTURE_2D, textureid_);
-    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, attrib_.viewport.x, attrib_.viewport.y, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
     glBindTexture(GL_TEXTURE_2D, 0);
@@ -37,19 +41,26 @@ FrameBuffer::FrameBuffer(uint width, uint height, bool useDepthBuffer)
                            GL_TEXTURE_2D, textureid_, 0);
 
     // attach the renderbuffer to depth attachment point
-    if (useDepthBuffer){
+    if (usedepth_){
         glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
                               GL_RENDERBUFFER, rboId);
     }
     checkFramebufferStatus();
-
-    FrameBuffer::release();
 }
 
-
 FrameBuffer::~FrameBuffer()
 {
-    glDeleteFramebuffers(1, &framebufferid_);
+    if (framebufferid_)
+        glDeleteFramebuffers(1, &framebufferid_);
+}
+
+
+uint FrameBuffer::texture() const
+{
+    if (framebufferid_ == 0)
+        return Resource::getTextureBlack();
+
+    return textureid_;
 }
 
 float FrameBuffer::aspectRatio() const
@@ -59,6 +70,9 @@ float FrameBuffer::aspectRatio() const
 
 void FrameBuffer::bind()
 {
+    if (!framebufferid_)
+        init();
+
     glBindFramebuffer(GL_FRAMEBUFFER, framebufferid_);
 }
 
@@ -86,6 +100,9 @@ void FrameBuffer::release()
 
 bool FrameBuffer::blit(FrameBuffer *other)
 {
+    if (!framebufferid_)
+        return false;
+
     if (attrib_.viewport.x != other->width() || attrib_.viewport.y != other->height())
         return false;
 
diff --git a/FrameBuffer.h b/FrameBuffer.h
index 393dcab..858db32 100644
--- a/FrameBuffer.h
+++ b/FrameBuffer.h
@@ -23,14 +23,17 @@ public:
 
     inline uint width() const { return attrib_.viewport.x; }
     inline uint height() const { return attrib_.viewport.y; }
-    inline uint texture() const { return textureid_; }
+    uint texture() const;
     float aspectRatio() const;
 
 private:
+    void init();
     void checkFramebufferStatus();
+
     RenderingAttrib attrib_;
     uint textureid_;
     uint framebufferid_;
+    bool usedepth_;
 };
 
 
diff --git a/ImGuiToolkit.h b/ImGuiToolkit.h
index 40c8d83..caf70fd 100644
--- a/ImGuiToolkit.h
+++ b/ImGuiToolkit.h
@@ -9,6 +9,8 @@
 
 namespace ImGuiToolkit
 {
+
+
     // Icons from resource icon.dds
     void Icon(int i, int j); 
     bool ButtonIcon(int i, int j);
diff --git a/ImGuiVisitor.cpp b/ImGuiVisitor.cpp
index 01ab9ed..0f2cb35 100644
--- a/ImGuiVisitor.cpp
+++ b/ImGuiVisitor.cpp
@@ -77,7 +77,7 @@ void ImGuiVisitor::visit(Primitive &n)
     ImGui::PushID(n.id());
     ImGui::Text("Primitive");
 
-    n.getShader()->accept(*this);
+    n.shader()->accept(*this);
 
     ImGui::PopID();
 }
@@ -89,7 +89,7 @@ void ImGuiVisitor::visit(ImageSurface &n)
 
 void ImGuiVisitor::visit(MediaSurface &n)
 {
-    ImGui::Text("%s", n.getResource().c_str());
+    ImGui::Text("%s", n.getUri().c_str());
 
     if (n.getMediaPlayer())
         n.getMediaPlayer()->accept(*this);
@@ -152,7 +152,7 @@ void ImGuiVisitor::visit(Scene &n)
     ImGui::SetNextItemOpen(true, ImGuiCond_Once);
     if (ImGui::CollapsingHeader("Scene Property Tree"))
     {
-        n.getRoot()->accept(*this);
+        n.root()->accept(*this);
     }
 }
 
diff --git a/MediaPlayer.cpp b/MediaPlayer.cpp
index 1506488..52b256e 100644
--- a/MediaPlayer.cpp
+++ b/MediaPlayer.cpp
@@ -67,11 +67,6 @@ void MediaPlayer::accept(Visitor& v) {
     v.visit(*this);
 }
 
-void MediaPlayer::bind()
-{
-    glBindTexture(GL_TEXTURE_2D, texture());
-}
-
 guint MediaPlayer::texture() const
 {
     if (textureindex_ == 0)
diff --git a/MediaPlayer.h b/MediaPlayer.h
index 6054db5..5e17087 100644
--- a/MediaPlayer.h
+++ b/MediaPlayer.h
@@ -191,10 +191,9 @@ public:
      * */
     double updateFrameRate() const;
     /**
-     * Bind / Get the OpenGL texture 
+     * Get the OpenGL texture
      * Must be called in OpenGL context
      * */
-    void bind();
     guint texture() const;
     /**
      * Get Image properties
diff --git a/Mesh.cpp b/Mesh.cpp
index d3bbf86..8f31f1b 100644
--- a/Mesh.cpp
+++ b/Mesh.cpp
@@ -321,36 +321,31 @@ bool parsePLY(string ascii,
 }
 
 
-Mesh::Mesh(const std::string& path, const std::string& texture) : Primitive(), resource_(path), texturefilename_(texture), textureindex_(0)
+Mesh::Mesh(const std::string& ply_path, const std::string& tex_path) : Primitive(), mesh_resource_(ply_path), texture_resource_(tex_path), textureindex_(0)
 {
-    if ( !parsePLY( Resource::getText(resource_), points_, colors_, texCoords_, indices_, drawMode_) )
+    if ( !parsePLY( Resource::getText(mesh_resource_), points_, colors_, texCoords_, indices_, drawMode_) )
     {
         points_.clear();
         colors_.clear();
         texCoords_.clear();
         indices_.clear();
-        Log::Warning("Mesh could not be created from %s", path.c_str());
+        Log::Warning("Mesh could not be created from %s", ply_path.c_str());
     }
+
+    // selective creation of the shader (deleted in Primitive)
+    if (texture_resource_.empty())
+        shader_ = new Shader;
+    else
+        shader_ = new ImageShader;
 }
 
-Mesh::~Mesh()
-{
-    delete shader_;
-}
 
 void Mesh::init()
 {
     Primitive::init();
 
-    if (!texturefilename_.empty())
-    {
-        // create shader for textured image
-        textureindex_ = Resource::getTextureImage(texturefilename_);
-        shader_ = new ImageShader();
-    }
-    else {
-        shader_ = new Shader();
-    }
+    if (!texture_resource_.empty())
+        textureindex_ = Resource::getTextureImage(texture_resource_);
 
 }
 
@@ -372,3 +367,43 @@ void Mesh::accept(Visitor& v)
     Primitive::accept(v);
     v.visit(*this);
 }
+
+Frame::Frame() : Node()
+{
+    icon_   = new Mesh("mesh/icon_video.ply");
+    border_ = new Mesh("mesh/border.ply");
+    shadow_ = new Mesh("mesh/shadow.ply", "mesh/shadow.png");
+    color   = glm::vec4( 0.8f, 0.8f, 0.f, 1.f);
+}
+
+void Frame::draw(glm::mat4 modelview, glm::mat4 projection)
+{
+    if ( !initialized() ) {
+        icon_->init();
+        border_->init();
+        shadow_->init();
+        init();
+    }
+
+    // shadow
+    shadow_->draw( modelview * transform_, projection);
+
+    // right side
+    float ar = scale_.x / scale_.y;
+    glm::vec3 s(scale_.y, scale_.y, 1.0);
+    glm::vec3 t(translation_.x - 1.0 +ar, translation_.y, translation_.z);
+    glm::mat4 ctm = modelview * transform(t, rotation_, s);
+
+    border_->shader()->color = color;
+    border_->draw( ctm, projection );
+    icon_->shader()->color = color;
+    icon_->draw( ctm, projection );
+
+    // left side
+    t.x = -t.x;
+    s.x = -s.x;
+    ctm = modelview * transform(t, rotation_, s);
+    border_->draw( ctm, projection );
+
+}
+
diff --git a/Mesh.h b/Mesh.h
index 73b2b63..8261a42 100644
--- a/Mesh.h
+++ b/Mesh.h
@@ -16,21 +16,34 @@
 class Mesh : public Primitive {
 
 public:
-    Mesh(const std::string& path, const std::string& texture = "");
-    ~Mesh();
+    Mesh(const std::string& ply_path, const std::string& tex_path = "");
 
     void init () override;
     void draw (glm::mat4 modelview, glm::mat4 projection) override;
     void accept (Visitor& v) override;
 
-    inline std::string getResource() const { return resource_; }
-    inline std::string getTexture() const { return texturefilename_; }
+    inline std::string meshPath() const { return mesh_resource_; }
+    inline std::string texturePath() const { return texture_resource_; }
 
 protected:
-    std::string resource_;
-    std::string texturefilename_;
+    std::string mesh_resource_;
+    std::string texture_resource_;
     uint textureindex_;
 
 };
 
+class Frame : public Node
+{
+    Mesh *border_;
+    Mesh *icon_;
+    Mesh *shadow_;
+
+public:
+    Frame();
+
+    void draw (glm::mat4 modelview, glm::mat4 projection) override;
+
+    glm::vec4 color;
+};
+
 #endif // MESH_H
diff --git a/Mixer.cpp b/Mixer.cpp
new file mode 100644
index 0000000..10e380d
--- /dev/null
+++ b/Mixer.cpp
@@ -0,0 +1,102 @@
+#include <algorithm>
+
+#include "defines.h"
+#include "View.h"
+#include "Primitives.h"
+#include "Mesh.h"
+#include "FrameBuffer.h"
+#include "Mixer.h"
+
+Mixer::Mixer()
+{
+    current_view_ = &mixing_;
+    current_source_ = Source::end();
+    update_time_ = GST_CLOCK_TIME_NONE;
+}
+
+
+void Mixer::update()
+{
+    // compute dt
+    if (update_time_ == GST_CLOCK_TIME_NONE)
+        update_time_ = gst_util_get_timestamp ();
+    gint64 current_time = gst_util_get_timestamp ();
+    gint64 dt = current_time - update_time_;
+    update_time_ = current_time;
+
+    // render of all sources
+    for( SourceList::iterator it = Source::begin(); it != Source::end(); it++){
+        (*it)->render();
+    }
+
+    // recursive update of all views
+    mixing_.update( static_cast<float>( GST_TIME_AS_MSECONDS(dt)) * 0.001f );
+    // TODO other views
+
+
+}
+
+// draw render view and current view
+void Mixer::draw()
+{
+    // always draw render view
+    render_.draw();
+
+    // draw the current view in the window
+    current_view_->draw();
+}
+
+// manangement of sources
+void Mixer::createSourceMedia(std::string uri)
+{
+
+}
+
+void Mixer::setCurrentSource(std::string namesource)
+{
+    current_source_ = std::find_if(Source::begin(), Source::end(), hasName(namesource)) ;
+}
+
+void Mixer::setcurrentSource(Source *s)
+{
+//    current_source_ = Source::
+}
+
+Source *Mixer::currentSource()
+{
+    if ( current_source_ == Source::end() )
+        return nullptr;
+    else {
+        return *(current_source_);
+    }
+}
+
+// management of view
+void Mixer::setCurrentView(viewMode m)
+{
+    switch (m) {
+    case MIXING:
+        current_view_ = &mixing_;
+        break;
+    default:
+        current_view_ = &mixing_;
+        break;
+    }
+}
+
+View *Mixer::getView(viewMode m)
+{
+    switch (m) {
+    case RENDERING:
+        return &render_;
+    case MIXING:
+        return &mixing_;
+    default:
+        return nullptr;
+    }
+}
+
+View *Mixer::currentView()
+{
+    return current_view_;
+}
diff --git a/Mixer.h b/Mixer.h
new file mode 100644
index 0000000..f435425
--- /dev/null
+++ b/Mixer.h
@@ -0,0 +1,59 @@
+#ifndef MIXER_H
+#define MIXER_H
+
+#include <vector>
+
+//  GStreamer
+#include <gst/gst.h>
+
+
+#include "View.h"
+#include "Source.h"
+
+class Mixer
+{
+    // Private Constructor
+    Mixer();
+    Mixer(Rendering const& copy);            // Not Implemented
+    Mixer& operator=(Rendering const& copy); // Not Implemented
+
+public:
+
+    static Mixer& manager()
+    {
+        // The only instance
+        static Mixer _instance;
+        return _instance;
+    }
+
+    // update all sources and all views
+    void update();
+
+    // draw render view and current view
+    void draw();
+
+    // manangement of sources
+    void createSourceMedia(std::string uri);
+
+    void setCurrentSource(std::string namesource);
+    void setcurrentSource(Source *s);
+    Source *currentSource();
+
+    // management of view
+    typedef enum {RENDERING = 0, MIXING=1, GEOMETRY=2, LAYER=3, INVALID=4 } viewMode;
+    View *getView(viewMode m);
+    void setCurrentView(viewMode m);
+    View *currentView();
+
+    inline FrameBuffer *frame() const { return render_.frameBuffer(); }
+
+protected:
+    RenderView render_;
+    MixingView mixing_;
+    View *current_view_;
+    gint64 update_time_;
+
+    SourceList::iterator current_source_;
+};
+
+#endif // MIXER_H
diff --git a/Primitives.cpp b/Primitives.cpp
index ac80bb5..78fd7d4 100644
--- a/Primitives.cpp
+++ b/Primitives.cpp
@@ -1,6 +1,7 @@
 #include "Primitives.h"
 #include "ImageShader.h"
 #include "Resource.h"
+#include "FrameBuffer.h"
 #include "MediaPlayer.h"
 #include "Visitor.h"
 #include "Log.h"
@@ -25,7 +26,7 @@ static const std::vector<glm::vec3> square_points {
 };
 
 
-ImageSurface::ImageSurface(const std::string& path) : Primitive(), resource_(path), textureindex_(0)
+Surface::Surface(Shader *s) : Primitive(s)
 {
     // geometry
     points_ = std::vector<glm::vec3> { glm::vec3( -1.f, -1.f, 0.f ), glm::vec3( -1.f, 1.f, 0.f ),
@@ -38,25 +39,9 @@ ImageSurface::ImageSurface(const std::string& path) : Primitive(), resource_(pat
     drawMode_ = GL_TRIANGLE_STRIP;
 }
 
-ImageSurface::~ImageSurface()
-{
-    if (shader_)
-        delete shader_;
-}
 
-void ImageSurface::init()
+void Surface::init()
 {
-    // load image if specified
-    if ( resource_.empty())
-        textureindex_ = Resource::getTextureBlack();
-    else {
-        float ar = 1.0;
-        textureindex_ = Resource::getTextureImage(resource_, &ar);
-        scale_.x = ar;
-    }
-    // a new shader for a new image
-    shader_ = new ImageShader();
-
     // use static unique vertex array object
     static uint unique_vao_ = 0;
     static uint unique_drawCount = 0;
@@ -77,6 +62,34 @@ void ImageSurface::init()
     }
 }
 
+void Surface::accept(Visitor& v)
+{
+    Primitive::accept(v);
+    v.visit(*this);
+}
+
+ImageSurface::ImageSurface(const std::string& path, Shader *s) : Surface(s), resource_(path), textureindex_(0)
+{
+
+}
+
+void ImageSurface::init()
+{
+    Surface::init();
+
+    // load image if specified (should always be the case)
+    if ( resource_.empty())
+        textureindex_ = Resource::getTextureBlack();
+    else {
+        float ar = 1.0;
+        textureindex_ = Resource::getTextureImage(resource_, &ar);
+        scale_.x = ar;
+    }
+
+    // a new shader for a new image
+    shader_ = new ImageShader();
+}
+
 void ImageSurface::draw(glm::mat4 modelview, glm::mat4 projection)
 {
     if ( !initialized() )
@@ -95,9 +108,9 @@ void ImageSurface::accept(Visitor& v)
     v.visit(*this);
 }
 
-MediaSurface::MediaSurface(const std::string& uri) : ImageSurface()
+MediaSurface::MediaSurface(const std::string& uri, Shader *s) : Surface(s)
 {
-    resource_ = uri;
+    uri_ = uri;
     mediaplayer_ = new MediaPlayer;
 }
 
@@ -108,12 +121,9 @@ MediaSurface::~MediaSurface()
 
 void MediaSurface::init()
 {
-    std::string tmp = resource_;
-    resource_ = "";
-    ImageSurface::init();
-    resource_ = tmp;
+    Surface::init();
 
-    mediaplayer_->open(resource_);
+    mediaplayer_->open(uri_);
     mediaplayer_->play(true);
 }
 
@@ -123,9 +133,9 @@ void MediaSurface::draw(glm::mat4 modelview, glm::mat4 projection)
         init();
 
     if ( mediaplayer_->isOpen() )
-        mediaplayer_->bind();
+        glBindTexture(GL_TEXTURE_2D, mediaplayer_->texture());
     else
-        glBindTexture(GL_TEXTURE_2D, textureindex_);
+        glBindTexture(GL_TEXTURE_2D, Resource::getTextureBlack());
 
     Primitive::draw(modelview, projection);
 
@@ -136,12 +146,6 @@ void MediaSurface::update( float dt )
 {
     if ( mediaplayer_->isOpen() ) {
         mediaplayer_->update();
-
-//        if (parent_ != nullptr) {
-//            parent_->transform_ = parent_->transform_ * glm::scale(glm::identity<glm::mat4>(), glm::vec3(mediaplayer_->aspectRatio(), 1.f, 1.f));
-//            scale_.x = 1.0;
-//        }
-//        else
         scale_.x = mediaplayer_->aspectRatio();
     }
 
@@ -150,12 +154,47 @@ void MediaSurface::update( float dt )
 
 void MediaSurface::accept(Visitor& v)
 {
-    ImageSurface::accept(v);
+    Primitive::accept(v);
     v.visit(*this);
 }
 
 
-Points::Points(std::vector<glm::vec3> points, glm::vec4 color, uint pointsize) : Primitive()
+FrameBufferSurface::FrameBufferSurface(FrameBuffer *fb, Shader *s) : Surface(s), frame_buffer_(fb)
+{
+
+}
+
+void FrameBufferSurface::init()
+{
+    Surface::init();
+
+    // set aspect ratio
+    scale_.x = frame_buffer_->aspectRatio();
+
+    // a new shader for a new image
+    shader_ = new ImageShader();
+}
+
+void FrameBufferSurface::draw(glm::mat4 modelview, glm::mat4 projection)
+{
+    if ( !initialized() )
+        init();
+
+    glBindTexture(GL_TEXTURE_2D, frame_buffer_->texture());
+
+    Primitive::draw(modelview, projection);
+
+    glBindTexture(GL_TEXTURE_2D, 0);
+}
+
+void FrameBufferSurface::accept(Visitor& v)
+{
+    Primitive::accept(v);
+    v.visit(*this);
+}
+
+
+Points::Points(std::vector<glm::vec3> points, glm::vec4 color, uint pointsize) : Primitive(new Shader)
 {
     for(size_t i = 0; i < points.size(); ++i)
     {
@@ -168,17 +207,7 @@ Points::Points(std::vector<glm::vec3> points, glm::vec4 color, uint pointsize) :
     pointsize_ = pointsize;
 }
 
-Points::~Points()
-{
-    if (shader_)
-        delete shader_;
-}
 
-void Points::init()
-{
-    Primitive::init();
-    shader_ = new Shader();
-}
 
 void Points::draw(glm::mat4 modelview, glm::mat4 projection)
 {
@@ -196,7 +225,7 @@ void Points::accept(Visitor& v)
     v.visit(*this);
 }
 
-LineStrip::LineStrip(std::vector<glm::vec3> points, glm::vec4 color, uint linewidth) : Primitive(), linewidth_(linewidth)
+LineStrip::LineStrip(std::vector<glm::vec3> points, glm::vec4 color, uint linewidth) : Primitive(new Shader), linewidth_(linewidth)
 {
     for(size_t i = 0; i < points.size(); ++i)
     {
@@ -208,18 +237,6 @@ LineStrip::LineStrip(std::vector<glm::vec3> points, glm::vec4 color, uint linewi
     drawMode_ = GL_LINE_STRIP;
 }
 
-LineStrip::~LineStrip()
-{
-    if (shader_)
-        delete shader_;
-}
-
-void LineStrip::init()
-{
-    Primitive::init();
-    shader_ = new Shader();
-}
-
 void LineStrip::draw(glm::mat4 modelview, glm::mat4 projection)
 {
     if ( !initialized() )
@@ -243,9 +260,6 @@ LineSquare::LineSquare(glm::vec4 color, uint linewidth) : LineStrip(square_point
 
 void LineSquare::init()
 {
-    // a new shader for a new line
-    shader_ = new Shader();
-
     // use static unique vertex array object
     static uint unique_vao_ = 0;
     static uint unique_drawCount = 0;
@@ -293,9 +307,6 @@ LineCircle::LineCircle(glm::vec4 color, uint linewidth) : LineStrip(std::vector<
 
 void LineCircle::init()
 {
-    // a new shader for a new line
-    shader_ = new Shader();
-
     // use static unique vertex array object
     static uint unique_vao_ = 0;
     static uint unique_drawCount = 0;
diff --git a/Primitives.h b/Primitives.h
index b1a6a49..c834c87 100644
--- a/Primitives.h
+++ b/Primitives.h
@@ -4,21 +4,43 @@
 #include <string>
 
 #include "Scene.h"
+#include "ImageShader.h"
+
 class MediaPlayer;
+class FrameBuffer;
+
 
 /**
- * @brief The ImageSurface class is a Primitive to draw an image
+ * @brief The Surface class is a Primitive to draw an flat square
+ * surface with texture coordinates.
+ *
+ * It uses a unique vertex array object to draw all surfaces.
  *
- * Image is read from the Ressouces (not an external file)
- * Height = 1.0, Width is set by the aspect ratio of the image
  */
-class ImageSurface : public Primitive {
+class Surface : public Primitive {
 
     void deleteGLBuffers_() override {}
 
 public:
-    ImageSurface(const std::string& path = "" );
-    ~ImageSurface();
+    Surface(Shader *s = new ImageShader);
+
+    void init () override;
+    void accept (Visitor& v) override;
+};
+
+
+/**
+ * @brief The ImageSurface class is a Surface to draw an image
+ *
+ * It creates an ImageShader for rendering.
+ *
+ * Image is read from the Ressouces (not an external file)
+ * Height = 1.0, Width is set by the aspect ratio of the image
+ */
+class ImageSurface : public Surface {
+
+public:
+    ImageSurface(const std::string& path, Shader *s = new ImageShader);
 
     void init () override;
     void draw (glm::mat4 modelview, glm::mat4 projection) override;
@@ -33,17 +55,15 @@ protected:
 
 
 /**
- * @brief The MediaSurface class is an ImageSurface to draw a video
+ * @brief The MediaSurface class is a Surface to draw a video
  *
  * URI is passed to a Media Player to handle the video playback
  * Height = 1.0, Width is set by the aspect ratio of the image
  */
-class MediaSurface : public ImageSurface {
-
-    MediaPlayer *mediaplayer_;
+class MediaSurface : public Surface {
 
 public:
-    MediaSurface(const std::string& uri);
+    MediaSurface(const std::string& uri, Shader *s = new ImageShader);
     ~MediaSurface();
 
     void init () override;
@@ -51,9 +71,34 @@ public:
     void accept (Visitor& v) override;
     void update (float dt) override;
 
+    inline std::string getUri() const { return uri_; }
     MediaPlayer *getMediaPlayer() { return mediaplayer_; }
+
+protected:
+    std::string uri_;
+    MediaPlayer *mediaplayer_;
 };
 
+/**
+ * @brief The FrameBufferSurface class is a Surface to draw a framebuffer
+ *
+ * URI is passed to a Media Player to handle the video playback
+ * Height = 1.0, Width is set by the aspect ratio of the image
+ */
+class FrameBufferSurface : public Surface {
+
+public:
+    FrameBufferSurface(FrameBuffer *fb, Shader *s = new ImageShader);
+
+    void init () override;
+    void draw (glm::mat4 modelview, glm::mat4 projection) override;
+    void accept (Visitor& v) override;
+
+    inline FrameBuffer *getFrameBuffer() const { return frame_buffer_; }
+
+protected:
+    FrameBuffer *frame_buffer_;
+};
 
 /**
  * @brief The Points class is a Primitive to draw Points
@@ -64,9 +109,7 @@ class Points : public Primitive {
 
 public:
     Points(std::vector<glm::vec3> points, glm::vec4 color, uint pointsize = 10);
-    ~Points();
 
-    virtual void init() override;
     virtual void draw(glm::mat4 modelview, glm::mat4 projection) override;
     virtual void accept(Visitor& v) override;
 
@@ -87,9 +130,7 @@ class LineStrip : public Primitive {
 
 public:
     LineStrip(std::vector<glm::vec3> points, glm::vec4 color, uint linewidth = 1);
-    ~LineStrip();
 
-    virtual void init() override;
     virtual void draw(glm::mat4 modelview, glm::mat4 projection) override;
     virtual void accept(Visitor& v) override;
 
diff --git a/RenderingManager.cpp b/RenderingManager.cpp
index 490a5a0..42f92de 100644
--- a/RenderingManager.cpp
+++ b/RenderingManager.cpp
@@ -328,8 +328,8 @@ RenderingAttrib Rendering::currentAttrib()
 
 glm::mat4 Rendering::Projection()
 {
-    glm::mat4 projection = glm::ortho(-5.0, 5.0, -5.0, 5.0, -5.0, 5.0);
-    glm::mat4 scale = glm::scale(glm::mat4(1.0f), glm::vec3(1.f, AspectRatio(), 1.f));
+    static glm::mat4 projection = glm::ortho(-SCENE_UNIT, SCENE_UNIT, -SCENE_UNIT, SCENE_UNIT, SCENE_DEPTH, 0.f);
+    glm::mat4 scale = glm::scale(glm::identity<glm::mat4>(), glm::vec3(1.f, AspectRatio(), 1.f));
 
     return projection * scale;
 }
@@ -337,11 +337,12 @@ glm::mat4 Rendering::Projection()
 
 glm::vec3 Rendering::unProject(glm::vec2 screen_coordinate, glm::mat4 modelview)
 {
-    glm::vec3 point;
-    glm::vec3 coordinates = glm::vec3( glm::vec2(screen_coordinate), 0.f);
+    glm::vec3 coordinates = glm::vec3( screen_coordinate.x, -screen_coordinate.y, 0.f);
     glm::vec4 viewport = glm::vec4( 0.f, 0.f, main_window_attributes_.viewport.x, main_window_attributes_.viewport.y);
 
-    point = glm::unProject(coordinates, modelview, Projection(), viewport);
+//    glm::mat4 mv = glm::scale(modelview, glm::vec3(1.f, -1.f, 1.f));
+//    glm::mat4 mv = glm::inverse(modelview);
+    glm::vec3 point = glm::unProject(coordinates, modelview, Projection(), viewport);
 
     return point;
 }
diff --git a/RenderingManager.h b/RenderingManager.h
index b684cb8..6657b79 100644
--- a/RenderingManager.h
+++ b/RenderingManager.h
@@ -77,7 +77,7 @@ public:
     // get projection matrix (for sharers) => Views
     glm::mat4 Projection();
     // unproject from window coordinate
-    glm::vec3 unProject(glm::vec2 screen_coordinate, glm::mat4 modelview);
+    glm::vec3 unProject(glm::vec2 screen_coordinate, glm::mat4 modelview = glm::mat4(1.f));
 
     // for opengl pipeline in gstreamer
     void LinkPipeline( GstPipeline *pipeline );
diff --git a/Scene.cpp b/Scene.cpp
index 172eb06..d802d96 100644
--- a/Scene.cpp
+++ b/Scene.cpp
@@ -57,6 +57,8 @@ void Node::accept(Visitor& v)
 Primitive::~Primitive()
 {
     deleteGLBuffers_();
+    if (shader_)
+        delete shader_;
 }
 
 void Primitive::init()
@@ -153,6 +155,14 @@ void Primitive::accept(Visitor& v)
     v.visit(*this);
 }
 
+void Primitive::replaceShader( Shader *newshader )
+{
+    if (newshader) {
+        if (shader_)
+            delete shader_;
+        shader_ = newshader;
+    }
+}
 
 void Primitive::deleteGLBuffers_()
 {
diff --git a/Scene.h b/Scene.h
index cece07a..d314e34 100644
--- a/Scene.h
+++ b/Scene.h
@@ -6,6 +6,7 @@
 #ifdef __APPLE__
 #include <sys/types.h>
 #endif
+
 #include <set>
 #include <vector>
 #include <glm/glm.hpp>
@@ -89,15 +90,15 @@ public:
 class Primitive : public Node {
 
 public:
-    Primitive() : Node(), shader_(nullptr), vao_(0), drawMode_(0), drawCount_(0) {}
+    Primitive(Shader *s = nullptr) : Node(), shader_(s), vao_(0), drawMode_(0), drawCount_(0) {}
     virtual ~Primitive();
 
     virtual void init () override;
     virtual void accept (Visitor& v) override;
     virtual void draw (glm::mat4 modelview, glm::mat4 projection) override;
 
-    inline Shader *getShader() const { return shader_; }
-    inline void setShader( Shader* e ) { shader_ = e; }
+    inline Shader *shader () const { return shader_; }
+    void replaceShader (Shader* newshader);
 
 protected:
     Shader*   shader_;
@@ -120,6 +121,8 @@ struct z_comparator
         return (a && b && a->translation_.z < b->translation_.z);
     }
 };
+typedef std::multiset<Node*, z_comparator> NodeSet;
+
 struct hasId: public std::unary_function<Node*, bool>
 {
     inline bool operator()(const Node* e) const
@@ -130,7 +133,6 @@ struct hasId: public std::unary_function<Node*, bool>
 private:
     int _id;
 };
-typedef std::multiset<Node*, z_comparator> NodeSet;
 
 /**
  * @brief The Group class contains a list of pointers to Nodes.
@@ -227,14 +229,18 @@ protected:
 // A scene contains a root node and gives a simplified API to add nodes
 class Scene  {
 
+    Group root_;
+
 public:
     Scene() {}
 
-    Group *getRoot() { return &root_; }
+    void accept (Visitor& v);
 
-    void accept(Visitor& v);
+    Group *root() { return &root_; }
 
-    Group root_;
+    // Node *find(int id);
+    // void remove(Node *n);
+    //
 
 };
 
diff --git a/SessionVisitor.cpp b/SessionVisitor.cpp
index 5c2031d..dda7128 100644
--- a/SessionVisitor.cpp
+++ b/SessionVisitor.cpp
@@ -69,7 +69,7 @@ void SessionVisitor::visit(Primitive &n)
     XMLElement *Primitive = xmlCurrent_;
 
     xmlCurrent_ = xmlDoc_->NewElement("Shader");
-    n.getShader()->accept(*this);
+    n.shader()->accept(*this);
     Primitive->InsertEndChild(xmlCurrent_);
 
     // revert to primitive as current
@@ -172,12 +172,12 @@ void SessionVisitor::visit(Mesh &n)
     // Node of a different type
     xmlCurrent_->SetAttribute("type", "Mesh");
 
-    XMLText *filename = xmlDoc_->NewText( n.getResource().c_str() );
+    XMLText *filename = xmlDoc_->NewText( n.meshPath().c_str() );
     XMLElement *obj = xmlDoc_->NewElement("resource");
     obj->InsertEndChild(filename);
     xmlCurrent_->InsertEndChild(obj);
 
-    filename = xmlDoc_->NewText( n.getTexture().c_str() );
+    filename = xmlDoc_->NewText( n.texturePath().c_str() );
     XMLElement *tex = xmlDoc_->NewElement("texture");
     tex->InsertEndChild(filename);
     xmlCurrent_->InsertEndChild(tex);
@@ -194,7 +194,7 @@ void SessionVisitor::visit(Scene &n)
 
     // start recursive traverse from root node
     xmlCurrent_ = xmlRoot_;
-    n.getRoot()->accept(*this);
+    n.root()->accept(*this);
 }
 
 void SessionVisitor::save(std::string filename)
diff --git a/Source.cpp b/Source.cpp
new file mode 100644
index 0000000..f339f6f
--- /dev/null
+++ b/Source.cpp
@@ -0,0 +1,63 @@
+
+#include <algorithm>
+
+#include "Source.h"
+
+// gobal static list of all sources
+SourceList Source::sources_;
+
+
+Source::Source(std::string name = "") : name_(""), buffer_(nullptr), shader_(nullptr), surface_(nullptr)
+{
+    // set a name
+    rename(name);
+
+    // add source to the list
+    sources_.push_back(this);
+}
+
+Source::~Source()
+{
+    sources_.remove(this);
+}
+
+std::string Source::rename (std::string newname)
+{
+    // tentative new name
+    std::string tentativename = newname;
+
+    // refuse to rename to an empty name
+    if ( newname.empty() )
+        tentativename = "source";
+
+    // trivial case : same name as current
+    if ( tentativename == name_ )
+        return name_;
+
+    // search for a source of the name 'tentativename'
+    std::string basename = tentativename;
+    int count = 1;
+    while ( std::find_if(sources_.begin(), sources_.end(), hasName(tentativename)) != sources_.end() ) {
+        tentativename = basename + std::to_string(++count);
+    }
+
+    // ok to rename
+    name_ = tentativename;
+    return name_;
+}
+
+
+SourceList::iterator Source::begin()
+{
+    return sources_.begin();
+}
+
+SourceList::iterator Source::end()
+{
+    return sources_.end();
+}
+
+uint Source::numSource()
+{
+    return sources_.size();
+}
diff --git a/Source.h b/Source.h
new file mode 100644
index 0000000..95e2bc3
--- /dev/null
+++ b/Source.h
@@ -0,0 +1,71 @@
+#ifndef SOURCE_H
+#define SOURCE_H
+
+#include <string>
+#include <list>
+
+#include "FrameBuffer.h"
+#include "ImageShader.h"
+#include "Primitives.h"
+
+class Source;
+// TODO : source set sorted by shader
+// so that the render loop avoid switching
+typedef std::list<Source *> SourceList;
+
+class Source
+{
+public:
+    // create a source and add it to the list
+    Source(std::string name);
+    virtual ~Source();
+
+    // manipulate name of source
+    inline std::string name () const { return name_; }
+    std::string rename (std::string newname);
+
+    // void setCustomShader();
+    inline Shader *shader() const { return shader_; }
+
+    // for scene
+    inline FrameBufferSurface *surface() const { return surface_; }
+
+    // only subclasses of sources can actually be instanciated
+    virtual void render() = 0;
+
+    // global management of list of sources
+    static SourceList::iterator begin();
+    static SourceList::iterator end();
+    static uint numSource();
+
+protected:
+    // name
+    std::string name_;
+
+    // a source draws in a frame buffer an input using a given shader
+    FrameBuffer *buffer_;
+    ImageShader *shader_;
+
+    // a surface is used to draw in the scenes
+    FrameBufferSurface *surface_;
+
+    // static global list of sources
+    static SourceList sources_;
+};
+
+
+struct hasName: public std::unary_function<Source*, bool>
+{
+    inline bool operator()(const Source* elem) const
+    {
+       return (elem && elem->name() == _n);
+    }
+
+    hasName(std::string n) : _n(n) { }
+
+private:
+    std::string _n;
+
+};
+
+#endif // SOURCE_H
diff --git a/UserInterfaceManager.cpp b/UserInterfaceManager.cpp
index 3b5763f..79ee6c6 100644
--- a/UserInterfaceManager.cpp
+++ b/UserInterfaceManager.cpp
@@ -38,6 +38,7 @@
 #include "FileDialog.h"
 #include "ImGuiToolkit.h"
 #include "GstToolkit.h"
+#include "Mixer.h"
 
 static std::thread loadThread;
 static bool loadThreadDone = false;
@@ -161,9 +162,25 @@ void UserInterface::handleMouse()
     if ( !ImGui::IsAnyWindowHovered() && !ImGui::IsAnyWindowFocused() )
     {
         // Mouse wheel over background
-        if ( io.MouseWheel > 0) {
+        if ( io.MouseWheel != 0) {
 
+            Mixer::manager().currentView()->zoom( io.MouseWheel );
 
+            Log::Info(" wheel %.1f", io.MouseWheel);
+        }
+
+        if ( ImGui::IsMouseDragging(ImGuiMouseButton_Right, 10.0f) )
+        {
+//            Log::Info("Mouse drag (%.1f,%.1f)(%.1f,%.1f)", io.MouseDelta.x, io.MouseDelta.y, io.MousePos.x, io.MousePos.y);
+
+            Mixer::manager().currentView()->drag( glm::vec2(io.MouseClickedPos[ImGuiMouseButton_Right].x, io.MouseClickedPos[ImGuiMouseButton_Right].y), glm::vec2(io.MousePos.x, io.MousePos.y));
+
+            ImGui::SetMouseCursor(ImGuiMouseCursor_ResizeAll);
+
+        }
+        else {
+
+            ImGui::SetMouseCursor(ImGuiMouseCursor_Arrow);
         }
 
         if ( ImGui::IsMouseDown(ImGuiMouseButton_Left)) {
diff --git a/View.cpp b/View.cpp
new file mode 100644
index 0000000..434a2b2
--- /dev/null
+++ b/View.cpp
@@ -0,0 +1,112 @@
+// Opengl
+#include <glad/glad.h>
+#include <glm/glm.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+
+#include "defines.h"
+#include "View.h"
+#include "Primitives.h"
+#include "Mesh.h"
+#include "FrameBuffer.h"
+#include "Log.h"
+
+
+View::View()
+{
+}
+
+void View::update(float dt)
+{
+    // recursive update from root of scene
+    scene.root()->update( dt );
+}
+
+MixingView::MixingView() : View()
+{
+    Mesh *disk = new Mesh("mesh/disk.ply", "images/transparencygrid.png");
+    backgound_.addChild(disk);
+
+    glm::vec4 pink( 0.8f, 0.f, 0.8f, 1.f );
+    LineCircle *circle = new LineCircle(pink, 5);
+    backgound_.addChild(circle);
+
+
+    scene.root()->addChild(&backgound_);
+    scene.root()->addChild(&foreground_);
+
+    // make sure there is no depth fight
+//    foreground.translation_ = glm::vec3(0.f, 0.f, 0.1f);
+}
+
+MixingView::~MixingView()
+{
+    // delete background
+    for (NodeSet::iterator node = backgound_.begin(); node != backgound_.end(); node++) {
+        delete (*node);
+    }
+
+}
+
+void MixingView::draw()
+{
+    // draw in main view
+    scene.root()->draw(glm::identity<glm::mat4>(), Rendering::manager().Projection());
+}
+
+void MixingView::zoom( float factor )
+{
+    float z = scene.root()->scale_.x;
+    z = CLAMP( z + 0.1f * factor, 0.2f, 10.f);
+    scene.root()->scale_.x = z;
+    scene.root()->scale_.y = z;
+
+}
+
+void MixingView::drag (glm::vec2 from, glm::vec2 to)
+{
+    static glm::vec3 start_translation = glm::vec3(0.f);
+    static glm::vec2 start_position = glm::vec2(0.f);
+
+    if ( start_position != from ) {
+        start_position = from;
+        start_translation = scene.root()->translation_;
+    }
+
+    // unproject
+    glm::vec3 gl_Position_from = Rendering::manager().unProject(from);
+    glm::vec3 gl_Position_to = Rendering::manager().unProject(to);
+
+    // compute delta translation
+    scene.root()->translation_ = start_translation + gl_Position_to - gl_Position_from;
+
+}
+
+RenderView::RenderView() : View(), frame_buffer_(nullptr)
+{
+    setResolution(1280, 720);
+}
+
+RenderView::~RenderView()
+{
+    if (frame_buffer_)
+        delete frame_buffer_;
+}
+
+
+void RenderView::setResolution(uint width, uint height)
+{
+    if (frame_buffer_)
+        delete frame_buffer_;
+
+    frame_buffer_ = new FrameBuffer(width, height);
+}
+
+void RenderView::draw()
+{
+    static glm::mat4 projection = glm::ortho(-SCENE_UNIT, SCENE_UNIT, -SCENE_UNIT, SCENE_UNIT, SCENE_DEPTH, 0.f);
+    glm::mat4 P  = glm::scale( projection, glm::vec3(1.f, frame_buffer_->aspectRatio(), 1.f));
+    frame_buffer_->begin();
+    scene.root()->draw(glm::identity<glm::mat4>(), P);
+    frame_buffer_->end();
+}
+
diff --git a/View.h b/View.h
new file mode 100644
index 0000000..f4a22e8
--- /dev/null
+++ b/View.h
@@ -0,0 +1,52 @@
+#ifndef VIEW_H
+#define VIEW_H
+
+#include <glm/glm.hpp>
+
+#include "Scene.h"
+class FrameBuffer;
+
+class View
+{
+public:
+    View();
+
+    virtual void update (float dt);
+    virtual void draw () = 0;
+    virtual void zoom (float) {}
+    virtual void drag (glm::vec2, glm::vec2) {}
+
+    Scene scene;
+
+protected:
+    Group backgound_;
+    Group foreground_;
+};
+
+
+class MixingView : public View
+{
+public:
+    MixingView();
+    ~MixingView();
+
+    void draw () override;
+    void zoom (float factor);
+    void drag (glm::vec2 from, glm::vec2 to);
+};
+
+class RenderView : public View
+{
+    FrameBuffer *frame_buffer_;
+
+public:
+    RenderView ();
+    ~RenderView ();
+
+    void draw () override;
+
+    void setResolution (uint width, uint height);
+    inline FrameBuffer *frameBuffer () const { return frame_buffer_; }
+
+};
+#endif // VIEW_H
diff --git a/defines.h b/defines.h
index 3b82525..1c2d214 100644
--- a/defines.h
+++ b/defines.h
@@ -16,7 +16,8 @@
 #define EXP100(val) (exp(log(10.0)/50.0*(float)(val))-1.0)
 #define EUCLIDEAN(P1, P2) sqrt((P1.x() - P2.x()) * (P1.x() - P2.x()) + (P1.y() - P2.y()) * (P1.y() - P2.y()))
 
-#define SCENE_UNIT 10.0
+#define SCENE_UNIT 5.f
+#define SCENE_DEPTH -10.f
 #define CIRCLE_SQUARE_DIST(x,y) ( (x*x + y*y) / (SCENE_UNIT * SCENE_UNIT * SCENE_UNIT * SCENE_UNIT) )
 
 #define IMGUI_TITLE_MAINWINDOW ICON_FA_CIRCLE_NOTCH " v-mix"
diff --git a/main.cpp b/main.cpp
index 0b0ea3b..a8b3949 100644
--- a/main.cpp
+++ b/main.cpp
@@ -16,24 +16,27 @@
 #include <gst/gst.h>
 #include <gst/gstbin.h>
 #include <gst/gl/gl.h>
+#include "GstToolkit.h"
+
+// imgui
+#include "imgui.h"
+#include "ImGuiToolkit.h"
+#include "ImGuiVisitor.h"
 
 // vmix
 #include "defines.h"
-#include "ImageShader.h"
 #include "Settings.h"
-#include "Resource.h"
-#include "FrameBuffer.h"
+
+// mixing
+#include "Mixer.h"
 #include "RenderingManager.h"
 #include "UserInterfaceManager.h"
 
-#include "imgui.h"
-#include "ImGuiToolkit.h"
-#include "GstToolkit.h"
+
 #include "MediaPlayer.h"
 #include "Scene.h"
 #include "Primitives.h"
 #include "Mesh.h"
-#include "ImGuiVisitor.h"
 #include "SessionVisitor.h"
 
 #define PI 3.14159265358979323846
@@ -50,9 +53,8 @@
 ////    ("file:///home/bhbn/Videos/iss.mov");
 ////    ("file:///home/bhbn/Videos//iss.mov");
 ////    ("file:///Users/Herbelin/Movies/mp2test.mpg");
-///
-Scene scene;
-FrameBuffer *output;
+
+
 MediaSurface testnode1("file:///home/bhbn/Videos/iss.mov");
 MediaSurface testnode2("file:///home/bhbn/Videos/fish.mp4");
 ImageSurface testnode3("images/seed_512.jpg");
@@ -170,35 +172,42 @@ void drawMediaPlayer()
 
 void drawScene()
 {
-    // compute dt
-    static gint64 last_time = gst_util_get_timestamp ();
-    gint64 current_time = gst_util_get_timestamp ();
-    gint64 dt = current_time - last_time;
-    last_time = current_time;
+//    // compute dt
+//    static gint64 last_time = gst_util_get_timestamp ();
+//    gint64 current_time = gst_util_get_timestamp ();
+//    gint64 dt = current_time - last_time;
+//    last_time = current_time;
 
-    // recursive update from root of scene
-    scene.root_.update( static_cast<float>( GST_TIME_AS_MSECONDS(dt)) * 0.001f );
+//    // recursive update from root of scene
+//    scene.root()->update( static_cast<float>( GST_TIME_AS_MSECONDS(dt)) * 0.001f );
 
-    // draw in output frame buffer
-    glm::mat4 MV = glm::identity<glm::mat4>();
-    glm::mat4 P  = glm::scale( glm::ortho(-5.f, 5.f, -5.f, 5.f), glm::vec3(1.f, output->aspectRatio(), 1.f));
-    output->begin();
-    scene.root_.draw(MV, P);
-    output->end();
+//    // draw in output frame buffer
+//    glm::mat4 MV = glm::identity<glm::mat4>();
 
-    // draw in main view
-    scene.root_.draw(MV, Rendering::manager().Projection());
+//    static glm::mat4 projection = glm::ortho(-SCENE_UNIT, SCENE_UNIT, -SCENE_UNIT, SCENE_UNIT, SCENE_DEPTH, 0.f);
+//    glm::mat4 P  = glm::scale( projection, glm::vec3(1.f, output->aspectRatio(), 1.f));
+//    output->begin();
+//    scene.root()->draw(MV, P);
+//    output->end();
+
+//    // draw in main view
+//    scene.root()->draw(MV, Rendering::manager().Projection());
+
+    Mixer::manager().update();
+
+    Mixer::manager().draw();
 
     // draw GUI tree scene
     ImGui::Begin(IMGUI_TITLE_MAINWINDOW);
     static ImGuiVisitor v;
-    scene.accept(v);
+    Mixer::manager().currentView()->scene.accept(v);
     ImGui::End();
 }
 
 
 void drawPreview()
 {
+    FrameBuffer *output = Mixer::manager().frame();
     if (output)
     {
         ImGui::SetNextWindowPos(ImVec2(100, 300), ImGuiCond_FirstUseEver);
@@ -246,6 +255,7 @@ int main(int, char**)
 //    UserInterface::manager().OpenTextEditor( Resource::getText("shaders/texture-shader.fs") );
 
     // init the scene
+    Mixer::manager().setCurrentView(Mixer::MIXING);
     Rendering::manager().PushFrontDrawCallback(drawScene);
 
     // init elements to the scene
@@ -256,53 +266,51 @@ int main(int, char**)
     glm::vec4 pink( 0.8f, 0.f, 0.8f, 1.f );
     LineCircle circle(pink, 5);
 
-    glm::vec4 color( 0.8f, 0.8f, 0.f, 1.f);
-    LineSquare border(color, 5);
-    Mesh shadow("mesh/shadow.ply", "mesh/shadow.png");
+//    glm::vec4 color( 0.8f, 0.8f, 0.f, 1.f);
+//    LineSquare border(color, 5);
+//    Mesh shadow("mesh/shadow.ply", "mesh/shadow.png");
+//    Mesh meshicon("mesh/icon_video.ply");
+
+    Frame frame;
+    frame.scale_ = glm::vec3(1.7777778f, 1.f, 1.f);
 
     Group g1;
-    g1.translation_ = glm::vec3(1.f, 1.f, 0.2f);
+    g1.translation_ = glm::vec3(1.f, 1.f, 1.f);
     g1.scale_ = glm::vec3(0.8f, 0.8f, 1.f);
 
     Group g2;
-    g2.translation_ = glm::vec3(-1.f, -1.f, 0.4f);
+    g2.translation_ = glm::vec3(-1.f, -1.f, 2.f);
 
     Animation A;
-    A.speed_ = 0.05f;
+    A.translation_ = glm::vec3(0.f, 0.f, 3.f);
+    A.speed_ = 0.1f;
     A.axis_ = glm::vec3(1.f, 1.f, 1.f);
 
 //    std::vector<glm::vec3> pts = std::vector<glm::vec3> { glm::vec3( 0.f, 0.f, 0.f ) };
 //    Points P(pts, pink);
 //    P.setPointSize(60);
-    Mesh P("mesh/target.ply");
+    Mesh P("mesh/point.ply");
     P.scale_ = glm::vec3(0.15f);
 
-    Mesh meshicon("mesh/icon_video.ply");
-
     // build tree
-    scene.root_.addChild(&disk);
-    scene.root_.addChild(&circle);
+    Mixer::manager().currentView()->scene.root()->addChild(&disk);
+    Mixer::manager().currentView()->scene.root()->addChild(&circle);
 
     g1.addChild(&testnode3);
-    g1.addChild(&border);
-    g1.addChild(&shadow);
-    scene.root_.addChild(&g1);
+    Mixer::manager().currentView()->scene.root()->addChild(&g1);
 
     g2.addChild(&testnode1);
-    g2.addChild(&border);
-    g2.addChild(&shadow);
-    g2.addChild(&meshicon);
-    scene.root_.addChild(&g2);
+    g2.addChild(&frame);
+    Mixer::manager().currentView()->scene.root()->addChild(&g2);
 
     A.addChild(&P);
-    scene.root_.addChild(&A);
+    Mixer::manager().currentView()->scene.root()->addChild(&A);
 
     // init output FBO
-    output = new FrameBuffer(1280, 720);
     Rendering::manager().PushBackDrawCallback(drawPreview);
 
     // add media player
-    Rendering::manager().PushBackDrawCallback(drawMediaPlayer);
+//    Rendering::manager().PushBackDrawCallback(drawMediaPlayer);
 
     ///
     /// Main LOOP
@@ -313,10 +321,6 @@ int main(int, char**)
     }
 
 
-        SessionVisitor savetoxml;
-        scene.accept(savetoxml);
-        savetoxml.save("/home/bhbn/test.vmx");
-
     UserInterface::manager().Terminate();
     Rendering::manager().Terminate();
 
diff --git a/rsc/mesh/border.ply b/rsc/mesh/border.ply
index d5b85d9..2a68fe9 100644
--- a/rsc/mesh/border.ply
+++ b/rsc/mesh/border.ply
@@ -1,7 +1,7 @@
 ply
 format ascii 1.0
 comment Created by Blender 2.82 (sub 7) - www.blender.org, source file: 'border.blend'
-element vertex 72
+element vertex 45
 property float x
 property float y
 property float z
@@ -9,174 +9,107 @@ property uchar red
 property uchar green
 property uchar blue
 property uchar alpha
-element face 96
+element face 56
 property list uchar uint vertex_indices
 end_header
--1.026677 0.976163 0.000000 255 255 255 255
--1.011723 0.988680 0.000000 255 255 255 255
--1.013049 0.963196 0.000000 255 255 255 255
--1.025333 1.001990 0.000000 255 255 255 255
--1.002709 1.003049 0.000000 255 255 255 255
--0.991672 0.992002 0.000000 255 255 255 255
--1.000587 0.977791 0.000000 255 255 255 255
--0.986586 1.010839 0.000000 255 255 255 255
--0.962045 1.013040 0.000000 255 255 255 255
--0.975727 0.999706 0.000000 255 255 255 255
--0.950140 1.000495 0.000000 255 255 255 255
--0.000007 1.013040 0.000000 255 255 255 255
--0.000013 1.000495 0.000000 255 255 255 255
-0.000000 1.026677 0.000000 255 255 255 255
-0.962791 1.013040 0.000000 255 255 255 255
-0.950865 1.000495 0.000000 255 255 255 255
-0.971288 0.999918 0.000000 255 255 255 255
-0.982108 1.011054 0.000000 255 255 255 255
-0.991471 0.991066 0.000000 255 255 255 255
-1.010913 0.981270 0.000000 255 255 255 255
-1.002515 1.002103 0.000000 255 255 255 255
-1.013035 0.962582 0.000000 255 255 255 255
-0.999776 0.970463 0.000000 255 255 255 255
-1.026677 0.975541 0.000000 255 255 255 255
-1.024526 0.994481 0.000000 255 255 255 255
-1.016015 1.015594 0.000000 255 255 255 255
-0.995334 1.024665 0.000000 255 255 255 255
-0.975757 1.026677 0.000000 255 255 255 255
--0.974986 1.026677 0.000000 255 255 255 255
--0.999859 1.024447 0.000000 255 255 255 255
--1.016198 1.016553 0.000000 255 255 255 255
-1.026677 0.000000 0.000000 255 255 255 255
-1.013035 -0.962588 0.000000 255 255 255 255
-1.013035 -0.000003 0.000000 255 255 255 255
-1.026677 -0.975541 0.000000 255 255 255 255
-1.010751 -0.987179 0.000000 255 255 255 255
-0.999616 -0.976310 0.000000 255 255 255 255
-1.000487 -0.950672 0.000000 255 255 255 255
-0.991132 -0.991616 0.000000 255 255 255 255
-0.984074 -1.010769 0.000000 255 255 255 255
-1.002173 -1.002655 0.000000 255 255 255 255
-0.961848 -1.013045 0.000000 255 255 255 255
-0.973233 -0.999640 0.000000 255 255 255 255
-0.974801 -1.026677 0.000000 255 255 255 255
-0.997326 -1.024371 0.000000 255 255 255 255
-1.015669 -1.016148 0.000000 255 255 255 255
-1.024362 -1.000464 0.000000 255 255 255 255
-1.000487 0.950662 0.000000 255 255 255 255
--1.026677 -0.974622 0.000000 255 255 255 255
--1.011117 -0.987925 0.000000 255 255 255 255
--1.024719 -1.001219 0.000000 255 255 255 255
--1.013049 -0.961680 0.000000 255 255 255 255
--0.999987 -0.977048 0.000000 255 255 255 255
--0.992284 -0.992011 0.000000 255 255 255 255
--1.003327 -1.003055 0.000000 255 255 255 255
--1.002193 -1.025218 0.000000 255 255 255 255
--1.016824 -1.016553 0.000000 255 255 255 255
--0.988890 -1.011604 0.000000 255 255 255 255
--0.978005 -1.000466 0.000000 255 255 255 255
--0.963002 -1.013045 0.000000 255 255 255 255
--0.951086 -1.000505 0.000000 255 255 255 255
--0.000007 -1.013045 0.000000 255 255 255 255
-0.949933 -1.000505 0.000000 255 255 255 255
-0.000000 -1.026677 0.000000 255 255 255 255
--0.975957 -1.026677 0.000000 255 255 255 255
--1.026677 0.000000 0.000000 255 255 255 255
--1.013049 -0.000003 0.000000 255 255 255 255
--1.000513 0.951268 0.000000 255 255 255 255
--1.000513 -0.000005 0.000000 255 255 255 255
--1.000513 -0.949776 0.000000 255 255 255 255
-1.000487 -0.000005 0.000000 255 255 255 255
--0.000013 -1.000505 0.000000 255 255 255 255
+-0.950647 -1.000000 0.000000 255 255 255 255
+-0.000071 -1.013523 0.000000 255 255 255 255
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+0.997727 1.024837 0.000000 255 255 255 255
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+1.024775 1.000919 0.000000 255 255 255 255
+1.000889 -0.951116 0.000000 255 255 255 255
+-0.951593 1.000000 0.000000 255 255 255 255
+-0.000071 1.013506 0.000000 255 255 255 255
+-0.963515 1.013506 0.000000 255 255 255 255
+0.950312 1.000000 0.000000 255 255 255 255
+-0.000064 1.027145 0.000000 255 255 255 255
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+1.000000 0.000000 0.000000 255 255 255 255
+-0.000064 1.000000 0.000000 255 255 255 255
+-0.976476 1.027145 0.000000 255 255 255 255
 3 0 1 2
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-3 14 16 15
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-3 19 18 20
-3 21 22 19
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-3 28 7 29
-3 29 4 30
-3 6 2 1
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-3 31 32 33
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-3 32 36 37
-3 35 38 36
-3 39 38 40
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-3 54 50 49
-3 54 55 56
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-3 60 61 59
-3 61 62 41
-3 41 63 61
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-3 65 51 48
-3 65 2 66
-3 66 67 68
-3 69 66 68
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+3 25 21 20
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 3 0 3 1
-3 3 30 4
-3 1 4 5
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-3 10 8 11
-3 8 28 13
-3 13 27 14
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-3 14 17 16
-3 17 20 18
-3 19 22 18
-3 21 47 22
-3 19 24 23
-3 24 19 20
-3 20 17 26
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-3 28 8 7
-3 29 7 4
-3 6 67 2
-3 31 33 21
-3 31 34 32
-3 34 46 35
-3 32 35 36
-3 35 40 38
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-3 41 62 42
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-3 40 35 46
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-3 60 71 61
-3 61 71 62
-3 41 43 63
-3 63 64 59
-3 64 55 57
-3 65 66 51
-3 65 0 2
-3 66 2 67
-3 69 51 66
+3 3 41 4
+3 4 18 5
+3 1 5 6
+3 5 8 7
+3 8 11 9
+3 10 13 9
+3 12 35 13
+3 10 15 14
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+3 8 5 18
+3 19 21 12
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+3 20 23 24
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+3 27 30 26
+3 29 39 30
+3 27 32 31
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+3 29 31 40
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diff --git a/rsc/mesh/icon_image.ply b/rsc/mesh/icon_image.ply
index 91bd762..5d7d9b7 100644
--- a/rsc/mesh/icon_image.ply
+++ b/rsc/mesh/icon_image.ply
@@ -12,67 +12,67 @@ property uchar alpha
 element face 57
 property list uchar uint vertex_indices
 end_header
--0.656711 -0.879600 0.000000 255 255 255 255
--0.677007 -0.717270 0.000000 255 255 255 255
--0.656711 -0.696979 0.000000 255 255 255 255
--0.900258 -0.696979 0.000000 255 255 255 255
--0.879962 -0.717270 0.000000 255 255 255 255
--0.900258 -0.879600 0.000000 255 255 255 255
--0.677007 -0.859309 0.000000 255 255 255 255
--0.879962 -0.859309 0.000000 255 255 255 255
--0.720607 -0.737700 0.000000 255 255 255 255
--0.724736 -0.737700 0.000000 255 255 255 255
--0.722672 -0.737561 0.000000 255 255 255 255
--0.726717 -0.738105 0.000000 255 255 255 255
--0.718627 -0.738105 0.000000 255 255 255 255
--0.728595 -0.738758 0.000000 255 255 255 255
--0.716749 -0.738758 0.000000 255 255 255 255
--0.730353 -0.739640 0.000000 255 255 255 255
--0.714991 -0.739640 0.000000 255 255 255 255
--0.731971 -0.740733 0.000000 255 255 255 255
--0.713372 -0.740733 0.000000 255 255 255 255
--0.733433 -0.742020 0.000000 255 255 255 255
--0.711910 -0.742020 0.000000 255 255 255 255
--0.734720 -0.743482 0.000000 255 255 255 255
--0.710623 -0.743482 0.000000 255 255 255 255
--0.735814 -0.745100 0.000000 255 255 255 255
--0.709529 -0.745100 0.000000 255 255 255 255
--0.736697 -0.746858 0.000000 255 255 255 255
--0.708647 -0.746858 0.000000 255 255 255 255
--0.737349 -0.748735 0.000000 255 255 255 255
--0.707994 -0.748735 0.000000 255 255 255 255
--0.737754 -0.750715 0.000000 255 255 255 255
--0.707589 -0.750715 0.000000 255 255 255 255
--0.737893 -0.752780 0.000000 255 255 255 255
--0.707450 -0.752780 0.000000 255 255 255 255
--0.707589 -0.754846 0.000000 255 255 255 255
--0.737754 -0.754846 0.000000 255 255 255 255
--0.707994 -0.756827 0.000000 255 255 255 255
--0.737349 -0.756827 0.000000 255 255 255 255
--0.708647 -0.758706 0.000000 255 255 255 255
--0.736697 -0.758706 0.000000 255 255 255 255
--0.773218 -0.798435 0.000000 255 255 255 255
--0.849519 -0.839018 0.000000 255 255 255 255
--0.798780 -0.757852 0.000000 255 255 255 255
--0.709529 -0.760463 0.000000 255 255 255 255
--0.735814 -0.760463 0.000000 255 255 255 255
--0.710623 -0.762082 0.000000 255 255 255 255
--0.734720 -0.762082 0.000000 255 255 255 255
--0.711910 -0.763543 0.000000 255 255 255 255
--0.733433 -0.763543 0.000000 255 255 255 255
--0.713372 -0.764829 0.000000 255 255 255 255
--0.731971 -0.764829 0.000000 255 255 255 255
--0.714991 -0.765922 0.000000 255 255 255 255
--0.730353 -0.765922 0.000000 255 255 255 255
--0.716749 -0.766803 0.000000 255 255 255 255
--0.728595 -0.766803 0.000000 255 255 255 255
--0.718627 -0.767455 0.000000 255 255 255 255
--0.726717 -0.767455 0.000000 255 255 255 255
--0.720607 -0.767859 0.000000 255 255 255 255
--0.724736 -0.767859 0.000000 255 255 255 255
--0.722672 -0.767998 0.000000 255 255 255 255
--0.707450 -0.839018 0.000000 255 255 255 255
--0.748041 -0.778550 0.000000 255 255 255 255
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+0.737190 -0.792443 0.000000 255 255 255 255
 3 0 1 2
 3 1 3 2
 3 1 4 3
diff --git a/rsc/mesh/icon_video.ply b/rsc/mesh/icon_video.ply
index 337c6a1..c6d9089 100644
--- a/rsc/mesh/icon_video.ply
+++ b/rsc/mesh/icon_video.ply
@@ -1,7 +1,7 @@
 ply
 format ascii 1.0
 comment Created by Blender 2.82 (sub 7) - www.blender.org, source file: 'icons.blend'
-element vertex 61
+element vertex 64
 property float x
 property float y
 property float z
@@ -9,124 +9,150 @@ property uchar red
 property uchar green
 property uchar blue
 property uchar alpha
-element face 57
+element face 80
 property list uchar uint vertex_indices
 end_header
-0.656711 -0.879600 0.000000 255 255 255 255
-0.677007 -0.717270 0.000000 255 255 255 255
-0.656711 -0.696979 0.000000 255 255 255 255
-0.900258 -0.696979 0.000000 255 255 255 255
-0.879962 -0.717270 0.000000 255 255 255 255
-0.900258 -0.879600 0.000000 255 255 255 255
-0.677007 -0.859309 0.000000 255 255 255 255
-0.879962 -0.859309 0.000000 255 255 255 255
-0.720607 -0.737700 0.000000 255 255 255 255
-0.724736 -0.737700 0.000000 255 255 255 255
-0.722672 -0.737561 0.000000 255 255 255 255
-0.726717 -0.738105 0.000000 255 255 255 255
-0.718627 -0.738105 0.000000 255 255 255 255
-0.728595 -0.738758 0.000000 255 255 255 255
-0.716749 -0.738758 0.000000 255 255 255 255
-0.730353 -0.739640 0.000000 255 255 255 255
-0.714991 -0.739640 0.000000 255 255 255 255
-0.731971 -0.740733 0.000000 255 255 255 255
-0.713372 -0.740733 0.000000 255 255 255 255
-0.733433 -0.742020 0.000000 255 255 255 255
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-0.737349 -0.748735 0.000000 255 255 255 255
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diff --git a/rsc/mesh/point.ply b/rsc/mesh/point.ply
index c1f68ae..a05a1df 100644
--- a/rsc/mesh/point.ply
+++ b/rsc/mesh/point.ply
@@ -5,6 +5,11 @@ element vertex 97
 property float x
 property float y
 property float z
+property float nx
+property float ny
+property float nz
+property float s
+property float t
 property uchar red
 property uchar green
 property uchar blue
@@ -12,103 +17,103 @@ property uchar alpha
 element face 160
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