Implementation of Mesh Primitive Node to draw geometries (replace OBJ).

CMakeLists.txt

@@ -164,9 +164,9 @@ message(STATUS "Compiling 'TinyFileDialog' from https://github.com/native-toolki
 #
 # OBJ LOADER
 #
-set(OBJLOADER_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/ext/obj)
-add_library(OBJLOADER "${CMAKE_CURRENT_SOURCE_DIR}/ext/obj/ObjLoader.cpp")
-message(STATUS "Compiling 'ObjLoader' from https://github.com/mortennobel/OpenGL_3_2_Utils -- ${OBJLOADER_INCLUDE_DIR}.")
+#set(OBJLOADER_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/ext/obj)
+#add_library(OBJLOADER "${CMAKE_CURRENT_SOURCE_DIR}/ext/obj/ObjLoader.cpp")
+#message(STATUS "Compiling 'ObjLoader' from https://github.com/mortennobel/OpenGL_3_2_Utils -- ${OBJLOADER_INCLUDE_DIR}.")
 
 # find_package(PkgConfig REQUIRED)
 # pkg_check_modules(GTK3 REQUIRED gtk+-3.0)
@@ -206,6 +206,7 @@ set(VMIX_SRCS
     ImageShader.cpp
     Scene.cpp
     Primitives.cpp
+    Mesh.cpp
     SessionVisitor.cpp
     Settings.cpp
     Screenshot.cpp
@@ -219,7 +220,6 @@ set(VMIX_SRCS
     ImGuiVisitor.cpp
     GstToolkit.cpp
     tinyxml2Toolkit.cpp
-    ColladaToolkit.cpp
 )
 
 set(VMIX_RSC_FILES
@@ -237,12 +237,11 @@ set(VMIX_RSC_FILES
     ./rsc/images/busy.png
     ./rsc/images/icons.dds
     ./rsc/images/seed_512.jpg
-    ./rsc/models/shadow.png
-    ./rsc/models/square_border.obj
-    ./rsc/models/shadow.mtl
-    ./rsc/models/disk.png
-    ./rsc/models/disk.obj
-    ./rsc/models/disk.mtl
+    ./rsc/images/transparencygrid.png
+    ./rsc/mesh/point.ply
+    ./rsc/mesh/disk.ply
+    ./rsc/mesh/shadow.ply
+    ./rsc/mesh/shadow.png
 )
 
 add_executable(${VMIX_BINARY}
@@ -276,7 +275,6 @@ target_link_libraries(${VMIX_BINARY} LINK_PRIVATE
     ${NFD_LIBRARY}
     ${PNG_LIBRARY}
     ${THREAD_LIBRARY}
-    OBJLOADER
     TINYXML2
     TINYFD
     IMGUI

ImGuiVisitor.cpp

@@ -80,10 +80,6 @@ void ImGuiVisitor::visit(Primitive &n)
     ImGui::PushID(n.id());
     ImGui::Text("Primitive");
 
-    // test compute coordinate
-    glm::vec3 center(0.f);
-
-
     n.getShader()->accept(*this);
 
     ImGui::PopID();
@@ -109,7 +105,11 @@ void ImGuiVisitor::visit(MediaPlayer &n)
 
 void ImGuiVisitor::visit(Shader &n)
 {
+    ImGui::PushID(n.id());
+
     ImGui::ColorEdit3("color", glm::value_ptr(n.color) ) ;
+
+    ImGui::PopID();
 }
 
 void ImGuiVisitor::visit(ImageShader &n)
@@ -131,9 +131,9 @@ void ImGuiVisitor::visit(LineCircle &n)
     ImGui::Text("Circle");
 }
 
-void ImGuiVisitor::visit(ObjModel &n)
+void ImGuiVisitor::visit(Mesh &n)
 {
-    ImGui::Text("ObjModel");
+    ImGui::Text("Mesh");
 }
 
 void ImGuiVisitor::visit(Scene &n)

ImGuiVisitor.h

@@ -19,7 +19,7 @@ public:
     void visit(LineStrip& n) override;
     void visit(LineSquare& n) override;
     void visit(LineCircle& n) override;
-    void visit(ObjModel& n) override;
+    void visit(Mesh& n) override;
 
     // Elements with attributes
     void visit(MediaPlayer& n) override;

Mesh.cpp

@@ -0,0 +1,375 @@
+#include <iostream>
+#include <sstream>
+#include <istream>
+#include <iterator>
+#include <vector>
+#include <map>
+#include <utility>
+
+#include <glad/glad.h>
+
+#include "Resource.h"
+#include "ImageShader.h"
+#include "Visitor.h"
+#include "Log.h"
+#include "Mesh.h"
+
+using namespace std;
+using namespace glm;
+
+
+
+typedef std::vector< std::pair< std::string, int> > plyElement;
+
+typedef struct prop {
+    std::string name;
+    bool is_float;
+    bool is_list;
+    prop(std::string n, bool t, bool l = false){
+        name = n;
+        is_float = t;
+        is_list = l;
+    }
+} plyProperty;
+
+typedef std::map<std::string, std::vector<plyProperty> > plyElementProperties;
+
+//float parseValue()
+template <typename T>
+T parseValue(std::istream& istream) {
+
+    T v;
+    char space = ' ';
+    istream >> v;
+    if (!istream.eof()) {
+        istream >> space >> std::ws;
+    }
+
+    return v;
+}
+
+/**
+ * @brief parsePLY
+ *
+ * Loosely inspired from libply
+ * https://web.archive.org/web/20151202190005/http://people.cs.kuleuven.be/~ares.lagae/libply/
+ *
+ * @param ascii content of an ascii PLY file
+ * @param outPositions vertices
+ * @param outColors colors
+ * @param outUV texture coordinates
+ * @param outIndices indices of faces
+ * @param outPrimitive type of faces (triangles, etc.)
+ * @return true on success read
+ */
+bool parsePLY(string ascii,
+              vector<vec3> &outPositions,
+              vector<vec4> &outColors,
+              vector<vec2> &outUV,
+              vector<uint> &outIndices,
+              uint &outPrimitive)
+{
+    stringstream istream(ascii);
+
+    std::string line;
+    std::size_t line_number_ = 0;
+
+    // magic
+    char magic[3];
+    istream.read(magic, 3);
+    istream.ignore(1);
+    ++line_number_;
+    if (!istream) {
+        Log::Warning("Parse error line %d: not ASCII?", line_number_);
+        return false;
+    }
+    if ((magic[0] != 'p') || (magic[1] != 'l') || (magic[2] != 'y')){
+
+        Log::Warning("Parse error line %d: not PLY format", line_number_);
+        return false;
+    }
+
+    plyElement elements;
+    plyElementProperties elementsProperties;
+    std::string current_element = "";
+
+    // parse header
+    while (std::getline(istream, line)) {
+
+        ++line_number_;
+        std::istringstream stringstream(line);
+        stringstream.unsetf(std::ios_base::skipws);
+
+        stringstream >> std::ws;
+        if (stringstream.eof()) {
+            Log::Warning("Ignoring line %d: '%s'", line_number_, line.c_str());
+        }
+
+        else {
+            std::string keyword;
+            stringstream >> keyword;
+
+            // format
+            if (keyword == "format") {
+                std::string format_string, version;
+                char space_format_format_string, space_format_string_version;
+                stringstream >> space_format_format_string >> std::ws >> format_string >> space_format_string_version >> std::ws >> version >> std::ws;
+                if (!stringstream || !stringstream.eof() ||
+                        !std::isspace(space_format_format_string) ||
+                        !std::isspace(space_format_string_version)) {
+                    Log::Warning("Parse error line %d: '%s'", line_number_, line.c_str());
+                    return false;
+                }
+                if (format_string != "ascii") {
+                    Log::Warning("Not PLY file format %s", format_string.c_str());
+                }
+                if (version != "1.0") {
+                    Log::Warning("Unsupported PLY version %s", version.c_str());
+                    return false;
+                }
+            }
+
+            // element
+            else if (keyword == "element") {
+                std::string name;
+                std::size_t count;
+                char space_element_name, space_name_count;
+                stringstream >> space_element_name >> std::ws >> name >> space_name_count >> std::ws >> count >> std::ws;
+                if (!stringstream || !stringstream.eof() ||
+                        !std::isspace(space_element_name) ||
+                        !std::isspace(space_name_count)) {
+                    Log::Warning("Parse error line %d: '%s'", line_number_, line.c_str());
+                    return false;
+                }
+                current_element = name;
+                elements.push_back( pair<string, int>{current_element, count} );
+            }
+
+            // property
+            else if (keyword == "property") {
+                std::string type_or_list;
+                char space_property_type_or_list;
+                stringstream >> space_property_type_or_list >> std::ws >> type_or_list;
+                if (!stringstream || !std::isspace(space_property_type_or_list)) {
+                    Log::Warning("Parse error line %d: '%s'", line_number_, line.c_str());
+                  return false;
+                }
+
+                // NOT A LIST property : i.e. a type & a name (e.g. 'property float x' )
+                if (type_or_list != "list") {
+                    std::string name;
+                    std::string& type = type_or_list;
+                    char space_type_name;
+                    stringstream >> space_type_name >> std::ws >> name >> std::ws;
+                    if (!stringstream || !std::isspace(space_type_name)) {
+                        Log::Warning("Parse error line %d: '%s'", line_number_, line.c_str());
+                        return false;
+                    }
+                    bool float_value =  ( type == "float" ) | ( type == "double" );
+                    elementsProperties[current_element].push_back(plyProperty(name, float_value));
+                }
+                // list property : several types & a name (e.g. 'property list uchar uint vertex_indices')
+                else {
+                    std::string name;
+                    std::string size_type_string, scalar_type_string;
+                    char space_list_size_type, space_size_type_scalar_type, space_scalar_type_name;
+                    stringstream >> space_list_size_type >> std::ws >> size_type_string >> space_size_type_scalar_type >> std::ws >> scalar_type_string >> space_scalar_type_name >> std::ws >> name >> std::ws;
+                    if (!stringstream || !std::isspace(space_list_size_type) ||
+                            !std::isspace(space_size_type_scalar_type) ||
+                            !std::isspace(space_scalar_type_name)) {
+                      Log::Warning("Parse error line %d: '%s'", line_number_, line.c_str());
+                      return false;
+                    }
+                    elementsProperties[current_element].push_back(plyProperty(name, false, true));
+                }
+
+            }
+
+            // end_header
+            else if (keyword == "end_header") {
+                break;
+            }
+        }
+    } // end while readline header
+
+    uint num_vertex_per_face = 0;
+    // loop over elements
+    for (int i=0; i< elements.size(); ++i)
+    {
+        std::string elem = elements[i].first;
+        int num_data = elements[i].second;
+
+        // loop over lines of properties of the element
+        for (int n = 0; n < num_data; ++n )
+        {
+            if (!std::getline(istream, line)) {
+                Log::Warning("Parse error line %d: '%s'", line_number_, line.c_str());
+                return false;
+            }
+            ++line_number_;
+            std::istringstream stringstream(line);
+            stringstream.unsetf(std::ios_base::skipws);
+            stringstream >> std::ws;
+
+            vec3 point = vec3(0.f, 0.f, 0.f);
+            vec4 color = vec4(1.f, 1.f, 1.f, 1.f);
+            vec2 uv = vec2(0.f, 0.f);
+            bool has_point = false;
+            bool has_uv = false;
+
+            // read each property of the element
+            for (int j = 0; j < elementsProperties[elem].size(); ++j)
+            {
+                plyProperty prop = elementsProperties[elem][j];
+
+                // a numerical property
+                if ( ! prop.is_list ) {
+
+                    float value;
+                    switch ( prop.name[0] ) {
+                    case 'x':
+                        point.x = parseValue<float>(stringstream);
+                        has_point = true;
+                        break;
+                    case 'y':
+                        point.y = parseValue<float>(stringstream);
+                        has_point = true;
+                        break;
+                    case 'z':
+                        point.z = parseValue<float>(stringstream);
+                        has_point = true;
+                        break;
+                    case 's':
+                        uv.x = parseValue<float>(stringstream);
+                        has_uv = true;
+                        break;
+                    case 't':
+                        uv.y = parseValue<float>(stringstream);
+                        has_uv = true;
+                        break;
+                    case 'r':
+                        color.r = (float) parseValue<int>(stringstream) / 255.f;
+                        break;
+                    case 'g':
+                        color.g = (float) parseValue<int>(stringstream) / 255.f;
+                        break;
+                    case 'b':
+                        color.b = (float) parseValue<int>(stringstream) / 255.f;
+                        break;
+                    case 'a':
+                        color.a = (float) parseValue<int>(stringstream) / 255.f;
+                        break;
+                    default:
+                        // ignore normals or other types
+                        value = parseValue<float>(stringstream);
+                        break;
+                    }
+                }
+                // a list property
+                else {
+                    // how many values in the list of index ?
+                    uint num_index = parseValue<int>(stringstream);
+
+                    // check that the number of vertex per face is consistent
+                    if (num_vertex_per_face == 0)
+                        num_vertex_per_face = num_index;
+                    else {
+                        if (num_vertex_per_face != num_index) {
+                            Log::Warning("Variable number of vertices per face not supported");
+                            return false;
+                        }
+                    }
+
+                    // safely append those indices
+                    for (uint k = 0; k < num_vertex_per_face; ++k ){
+                        uint index = parseValue<int>(stringstream);
+                        outIndices.push_back( index );
+                    }
+                }
+            }
+
+            // ok, we filled some values
+            if (has_point) {
+                outPositions.push_back(point);
+                outColors.push_back(color);
+                if (has_uv)
+                    outUV.push_back(uv);
+            }
+        }
+
+    }
+
+    switch (num_vertex_per_face) {
+    case 1:
+        outPrimitive = GL_POINTS;
+        break;
+    case 2:
+        outPrimitive = GL_LINES;
+        break;
+    case 3:
+        outPrimitive = GL_TRIANGLES;
+        break;
+    case 4:
+        outPrimitive = GL_QUADS;
+        break;
+    default:
+        Log::Warning("Invalid number of vertices per face. Please triangulate your mesh.");
+        return false;
+        break;
+    }
+
+    return true;
+}
+
+
+Mesh::Mesh(const std::string& path, const std::string& texture) : Primitive(), resource_(path), texturefilename_(texture), textureindex_(0)
+{
+    if ( !parsePLY( Resource::getText(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());
+    }
+}
+
+Mesh::~Mesh()
+{
+
+}
+
+void Mesh::init()
+{
+    Primitive::init();
+
+    if (!texturefilename_.empty())
+    {
+        // create shader for textured image
+        textureindex_ = Resource::getTextureImage(texturefilename_);
+        shader_ = new ImageShader();
+    }
+    else {
+        shader_ = new Shader();
+    }
+
+}
+
+void Mesh::draw(glm::mat4 modelview, glm::mat4 projection)
+{
+    if ( !initialized() )
+        init();
+
+    if (textureindex_)
+        glBindTexture(GL_TEXTURE_2D, textureindex_);
+
+    Primitive::draw(modelview, projection);
+
+    glBindTexture(GL_TEXTURE_2D, 0);
+}
+
+void Mesh::accept(Visitor& v)
+{
+    Primitive::accept(v);
+    v.visit(*this);
+}

Mesh.h

@@ -0,0 +1,36 @@
+#ifndef MESH_H
+#define MESH_H
+
+#include <string>
+#include <glm/glm.hpp>
+
+#include "Scene.h"
+
+/**
+ * @brief The Mesh class creates a Primitive node from a PLY File
+ *
+ *  PLY - Polygon File Format
+ *  Also known as the Stanford Triangle Format
+ *  http://paulbourke.net/dataformats/ply/
+ */
+class Mesh : public Primitive {
+
+public:
+    Mesh(const std::string& path, const std::string& texture = "");
+    ~Mesh();
+
+    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_; }
+
+protected:
+    std::string resource_;
+    std::string texturefilename_;
+    uint textureindex_;
+
+};
+
+#endif // MESH_H

Primitives.cpp

@@ -4,7 +4,6 @@
 #include "MediaPlayer.h"
 #include "Visitor.h"
 #include "Log.h"
-#include "ObjLoader.h"
 
 #include <glad/glad.h>
 
@@ -20,18 +19,17 @@
 #include <glm/gtx/rotate_vector.hpp>
 
 
-static const std::vector<glm::vec3> square_points { glm::vec3( -1.f, -1.f, 0.f ), glm::vec3( -1.f, 1.f, 0.f ),
-                                                   glm::vec3( 1.f, 1.f, 0.f ), glm::vec3( 1.f, -1.f, 0.f ),
-                                                  glm::vec3( -1.f, -1.f, 0.f )};
-static uint square_vao = 0;
-static uint circle_vao = 0;
+static const std::vector<glm::vec3> square_points {
+            glm::vec3( -0.99f, -1.f, 0.f ), glm::vec3( -1.f, -0.99f, 0.f ),
+            glm::vec3( -1.f, 0.99f, 0.f ), glm::vec3( -0.99f, 1.f, 0.f ),
+            glm::vec3( 0.99f, 1.f, 0.f ), glm::vec3( 1.f, 0.99f, 0.f ),
+            glm::vec3( 1.f, -0.99f, 0.f ), glm::vec3( 0.99f, -1.f, 0.f ),
+            glm::vec3( -0.99f, -1.f, 0.f )
+};
 
 
-ImageSurface::ImageSurface(const std::string& path) : Primitive(), textureindex_(0)
+ImageSurface::ImageSurface(const std::string& path) : Primitive(), resource_(path), textureindex_(0)
 {
-    // for image texture
-    resource_ = path;
-
     // geometry
     points_ = std::vector<glm::vec3> { glm::vec3( -1.f, -1.f, 0.f ), glm::vec3( -1.f, 1.f, 0.f ),
             glm::vec3( 1.f, -1.f, 0.f ), glm::vec3( 1.f, 1.f, 0.f ) };
@@ -40,7 +38,7 @@ ImageSurface::ImageSurface(const std::string& path) : Primitive(), textureindex_
     texCoords_ = std::vector<glm::vec2> { glm::vec2( 0.f, 1.f ), glm::vec2( 0.f, 0.f ),
             glm::vec2( 1.f, 1.f ), glm::vec2( 1.f, 0.f ) };
     indices_ = std::vector<uint> { 0, 1, 2, 3 };
-    drawingPrimitive_ = GL_TRIANGLE_STRIP;
+    drawMode_ = GL_TRIANGLE_STRIP;
 }
 
 
@@ -54,22 +52,26 @@ void ImageSurface::init()
         textureindex_ = Resource::getTextureImage(resource_, &ar);
         scale_.x = ar;
     }
-    // create shader for textured image
+    // a new shader for a new image
     shader_ = new ImageShader();
 
-    // use static global vertex array object
-    if (square_vao) {
+    // use static unique vertex array object
+    static uint unique_vao_ = 0;
+    static uint unique_drawCount = 0;
+    if (unique_vao_) {
         // 1. only init Node (not the primitive vao)
         Node::init();
         // 2. use the global vertex array object
-        vao_ = square_vao;
+        vao_ = unique_vao_;
+        drawCount_ = unique_drawCount;
     }
     else {
         // 1. init the Primitive (only once)
         Primitive::init();
         // 2. remember global vertex array object
-        square_vao = vao_;
-        // 3. square_vao_ will NOT be deleted because ImageSurface::deleteGLBuffers_() is empty
+        unique_vao_ = vao_;
+        unique_drawCount = drawCount_;
+        // 3. unique_vao_ will NOT be deleted because ImageSurface::deleteGLBuffers_() is empty
     }
 }
 
@@ -160,7 +162,7 @@ Points::Points(std::vector<glm::vec3> points, glm::vec4 color, uint pointsize) :
         indices_.push_back ( i );
     }
 
-    drawingPrimitive_ = GL_POINTS;
+    drawMode_ = GL_POINTS;
     pointsize_ = pointsize;
 }
 
@@ -186,7 +188,7 @@ void Points::accept(Visitor& v)
     v.visit(*this);
 }
 
-LineStrip::LineStrip(std::vector<glm::vec3> points, glm::vec4 color, uint linewidth) : Primitive()
+LineStrip::LineStrip(std::vector<glm::vec3> points, glm::vec4 color, uint linewidth) : Primitive(), linewidth_(linewidth)
 {
     for(size_t i = 0; i < points.size(); ++i)
     {
@@ -195,8 +197,7 @@ LineStrip::LineStrip(std::vector<glm::vec3> points, glm::vec4 color, uint linewi
         indices_.push_back ( i );
     }
 
-    drawingPrimitive_ = GL_LINE_STRIP;
-    linewidth_ = linewidth;
+    drawMode_ = GL_LINE_STRIP;
 }
 
 void LineStrip::init()
@@ -226,6 +227,38 @@ 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;
+    if (unique_vao_) {
+        // 1. only init Node (not the primitive vao)
+        Node::init();
+        // 2. use the global vertex array object
+        vao_ = unique_vao_;
+        drawCount_ = unique_drawCount;
+    }
+    else {
+        // 1. init the Primitive (only once)
+        Primitive::init();
+        // 2. remember global vertex array object
+        unique_vao_ = vao_;
+        unique_drawCount = drawCount_;
+        // 3. unique_vao_ will NOT be deleted because LineCircle::deleteGLBuffers_() is empty
+    }
+}
+
+void LineSquare::accept(Visitor& v)
+{
+    Primitive::accept(v);
+    v.visit(*this);
+}
+
+
 LineCircle::LineCircle(glm::vec4 color, uint linewidth) : LineStrip(std::vector<glm::vec3>(), color, linewidth)
 {
     static int N = 72;
@@ -246,21 +279,27 @@ LineCircle::LineCircle(glm::vec4 color, uint linewidth) : LineStrip(std::vector<
 
 void LineCircle::init()
 {
-    // use static global vertex array object
-    if (circle_vao) {
+    // 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;
+    if (unique_vao_) {
+        // 1. only init Node (not the primitive vao)
         Node::init();
-        // if set, use the global vertex array object
-        vao_ = square_vao;
+        // 2. use the global vertex array object
+        vao_ = unique_vao_;
+        drawCount_ = unique_drawCount;
     }
     else {
-        // 1. init as usual (only once)
+        // 1. init the Primitive (only once)
         Primitive::init();
-        // 2. remember global vao
-        circle_vao = vao_;
-        // 3. vao_ will not be deleted because deleteGLBuffers_() is empty
+        // 2. remember global vertex array object
+        unique_vao_ = vao_;
+        unique_drawCount = drawCount_;
+        // 3. unique_vao_ will NOT be deleted because LineCircle::deleteGLBuffers_() is empty
     }
-
-    shader_ = new Shader();
 }
 
 void LineCircle::accept(Visitor& v)
@@ -269,72 +308,3 @@ void LineCircle::accept(Visitor& v)
     v.visit(*this);
 }
 
-
-ObjModel::ObjModel(const std::string& path) : Primitive(), textureindex_(0)
-{
-    // for obj model
-    resource_ = path;
-
-    // load geometry
-    std::vector<glm::vec3> normals; // ignored
-    std::string material_filename;
-    bool okay = loadObject( Resource::getText(resource_), points_,
-                            normals, texCoords_, indices_, material_filename );
-    if ( okay ) {
-        // prepend path to the name of other files
-        std::string rsc_path = resource_.substr(0, resource_.rfind('/')) + "/";
-
-        // load materials
-        std::map<std::string,Material*> material_library;
-        okay = loadMaterialLibrary(Resource::getText( rsc_path + material_filename ), material_library);
-        if (okay) {
-            Material *material_ = material_library.begin()->second; // default use first material
-
-            // fill colors
-            for (int i = 0; i < points_.size(); i++)
-                colors_.push_back( glm::vec4( material_->diffuse, 1.0) );
-
-            if (!material_->diffuseTexture.empty()) {
-                texture_filename_ = rsc_path + material_->diffuseTexture;
-            }
-            delete material_;
-        }
-    }
-
-    drawingPrimitive_ = GL_TRIANGLES;
-}
-
-void ObjModel::init()
-{
-    Primitive::init();
-
-    if (!texture_filename_.empty())
-    {
-        // create shader for textured image
-        textureindex_ = Resource::getTextureImage(texture_filename_);
-        shader_ = new ImageShader();
-    }
-    else {
-        shader_ = new Shader();
-    }
-
-}
-
-void ObjModel::draw(glm::mat4 modelview, glm::mat4 projection)
-{
-    if ( !initialized() )
-        init();
-
-    if (textureindex_)
-        glBindTexture(GL_TEXTURE_2D, textureindex_);
-
-    Primitive::draw(modelview, projection);
-
-    glBindTexture(GL_TEXTURE_2D, 0);
-}
-
-void ObjModel::accept(Visitor& v)
-{
-    Primitive::accept(v);
-    v.visit(*this);
-}

Primitives.h

@@ -99,8 +99,13 @@ public:
 
 class LineSquare : public LineStrip {
 
+    void deleteGLBuffers_() override {}
+
 public:
     LineSquare(glm::vec4 color, uint linewidth = 1);
+
+    void init() override;
+    void accept(Visitor& v) override;
 };
 
 class LineCircle : public LineStrip {
@@ -115,22 +120,5 @@ public:
 };
 
 
-class ObjModel : public Primitive {
-
-public:
-    ObjModel(const std::string& 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_; }
-
-protected:
-    std::string resource_;
-    std::string texture_filename_;
-    uint textureindex_;
-};
-
 
 #endif // PRIMITIVES_H

Scene.cpp

@@ -63,10 +63,10 @@ Primitive::~Primitive()
 {
     deleteGLBuffers_();
 
-    points_.clear();
-    colors_.clear();
-    texCoords_.clear();
-    indices_.clear();
+//    points_.clear();
+//    colors_.clear();
+//    texCoords_.clear();
+//    indices_.clear();
 
 }
 
@@ -115,9 +115,16 @@ void Primitive::init()
     glBindBuffer(GL_ARRAY_BUFFER, 0);
     glBindVertexArray(0);
 
+    // drawing indications
+    drawCount_ = indices_.size();
+
     // delete temporary buffers
     if ( arrayBuffer_ )  glDeleteBuffers ( 1, &arrayBuffer_);
     if ( elementBuffer_ ) glDeleteBuffers ( 1, &elementBuffer_);    
+    points_.clear();
+    colors_.clear();
+    texCoords_.clear();
+    indices_.clear();
 
     Node::init();
 }
@@ -139,10 +146,12 @@ void Primitive::draw(glm::mat4 modelview, glm::mat4 projection)
         //
         // draw vertex array object
         //
+        if (drawMode_) {
             glBindVertexArray( vao_ );
-        glDrawElements( drawingPrimitive_, indices_.size(), GL_UNSIGNED_INT, 0  );
+            glDrawElements( drawMode_, drawCount_, GL_UNSIGNED_INT, 0  );
             glBindVertexArray(0);
         }
+    }
 }
 
 void Primitive::accept(Visitor& v)

Scene.h

@@ -55,7 +55,7 @@ public:
 class Primitive : public Node {
 
 public:
-    Primitive() : Node(), shader_(nullptr), vao_(0), drawingPrimitive_(0) {}
+    Primitive() : Node(), shader_(nullptr), vao_(0), drawMode_(0), drawCount_(0) {}
     virtual ~Primitive();
 
     virtual void init () override;
@@ -67,8 +67,7 @@ public:
 
 protected:
     Shader*   shader_;
-    uint vao_;
-    uint drawingPrimitive_;
+    uint vao_, drawMode_, drawCount_;
     std::vector<glm::vec3>     points_;
     std::vector<glm::vec4>     colors_;
     std::vector<glm::vec2>     texCoords_;

SessionVisitor.cpp

@@ -3,6 +3,7 @@
 #include "Log.h"
 #include "Scene.h"
 #include "Primitives.h"
+#include "Mesh.h"
 #include "ImageShader.h"
 #include "MediaPlayer.h"
 #include "GstToolkit.h"
@@ -166,15 +167,20 @@ void SessionVisitor::visit(LineCircle &n)
     xmlCurrent_->InsertEndChild(color);
 }
 
-void SessionVisitor::visit(ObjModel &n)
+void SessionVisitor::visit(Mesh &n)
 {
     // Node of a different type
-    xmlCurrent_->SetAttribute("type", "ObjModel");
+    xmlCurrent_->SetAttribute("type", "Mesh");
 
     XMLText *filename = xmlDoc_->NewText( n.getResource().c_str() );
     XMLElement *obj = xmlDoc_->NewElement("resource");
     obj->InsertEndChild(filename);
     xmlCurrent_->InsertEndChild(obj);
+
+    filename = xmlDoc_->NewText( n.getTexture().c_str() );
+    XMLElement *tex = xmlDoc_->NewElement("texture");
+    tex->InsertEndChild(filename);
+    xmlCurrent_->InsertEndChild(tex);
 }
 
 void SessionVisitor::visit(Scene &n)

SessionVisitor.h

@@ -26,7 +26,7 @@ public:
     void visit(LineStrip& n) override;
     void visit(LineSquare&) override;
     void visit(LineCircle& n) override;
-    void visit(ObjModel& n) override;
+    void visit(Mesh& n) override;
 
     // Elements with attributes
     void visit(MediaPlayer& n) override;

Shader.cpp

@@ -7,6 +7,8 @@
 #include <fstream>
 #include <sstream>
 #include <iostream>
+#include <chrono>
+#include <ctime>
 
 #include <glad/glad.h> 
 #include <GLFW/glfw3.h>
@@ -168,6 +170,10 @@ void ShadingProgram::checkLinkingErr()
 
 Shader::Shader() : blending(BLEND_OPACITY)
 {
+    // create unique id
+    auto duration = std::chrono::system_clock::now().time_since_epoch();
+    id_ = std::chrono::duration_cast<std::chrono::nanoseconds>(duration).count() % 100000000;
+
     program_ = &simpleShadingProgram;
     reset();
 }

Shader.h

@@ -37,10 +37,15 @@ private:
 
 class Shader
 {
+    int       id_;
+
 public:
     Shader();
     virtual ~Shader() {}
 
+    // unique identifyer generated at instanciation
+    inline int id () const { return id_; }
+
     virtual void use();
     virtual void reset();
     virtual void accept(Visitor& v);

Visitor.h

@@ -14,7 +14,7 @@ class MediaSurface;
 class LineStrip;
 class LineSquare;
 class LineCircle;
-class ObjModel;
+class Mesh;
 class MediaPlayer;
 class Shader;
 class ImageShader;
@@ -34,7 +34,7 @@ public:
     virtual void visit(LineStrip& n) = 0;
     virtual void visit(LineSquare& n) = 0;
     virtual void visit(LineCircle& n) = 0;
-    virtual void visit(ObjModel& n) = 0;
+    virtual void visit(Mesh& n) = 0;
     virtual void visit(MediaPlayer& n) = 0;
     virtual void visit(Shader& n) = 0;
     virtual void visit(ImageShader& n) = 0;

main.cpp

@@ -36,6 +36,7 @@
 #include "MediaPlayer.h"
 #include "Scene.h"
 #include "Primitives.h"
+#include "Mesh.h"
 #include "ImGuiVisitor.h"
 #include "SessionVisitor.h"
 
@@ -255,29 +256,32 @@ int main(int, char**)
     // init elements to the scene
     //testnode3.getShader()->blending = Shader::BLEND_OPACITY;
 
-    ObjModel disk("models/disk.obj");
+    Mesh disk("mesh/disk.ply", "images/transparencygrid.png");
+
     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);
-    ObjModel shadow("models/square_border.obj");
+//    ObjModel shadow("models/square_border.obj");
+    Mesh shadow("mesh/shadow.ply", "mesh/shadow.png");
 
     Group g1;
     g1.translation_ = glm::vec3(1.f, 1.f, 0.2f);
     g1.scale_ = glm::vec3(1.2f, 1.2f, 1.f);
 
-
     Group g2;
     g2.translation_ = glm::vec3(-1.f, -1.f, 0.4f);
 
     Animation A;
-    A.speed_ = 0.01f;
+    A.speed_ = 0.08f;
     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);
+//    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/point.ply");
+    P.scale_ = glm::vec3(0.05f);
 
     // build tree
     scene.root_.addChild(&disk);
@@ -291,10 +295,9 @@ int main(int, char**)
     g2.addChild(&shadow);
     g2.addChild(&testnode1);
     g2.addChild(&border);
+    scene.root_.addChild(&g2);
 
-//    A.addChild(&g2);
     A.addChild(&P);
-
     scene.root_.addChild(&A);
 
     // init output FBO

rsc/models/shadow.mtl

@@ -1,10 +0,0 @@
-newmtl Shadow
-Ns 323.999994
-Ka 1.000000 1.000000 1.000000
-Kd 0.800000 0.800000 0.800000
-Ks 0.500000 0.500000 0.500000
-Ke 0.000000 0.000000 0.000000
-Ni 1.450000
-d 1.000000
-illum 2
-map_Kd shadow.png

rsc/models/square_border.obj

@@ -1,29 +0,0 @@
-mtllib shadow.mtl 
-o square_border
-v -1.000000 -1.000000 0.000000
-v -1.400000 -1.400000 0.000000
-v 1.000000 -1.000000 0.000000
-v 1.400000 -1.400000 0.000000
-v -1.000000 1.000000 0.000000
-v -1.400000 1.400000 0.000000
-v 1.000000 1.000000 0.000000
-v 1.400000 1.400000 0.000000
-vt 0.2 0.80
-vt 1.00 1.00
-vt -0.00 1.00
-vt 0.80 0.80
-vt 1.00 -0.00
-vt 0.2 0.2
-vt -0.00 -0.00
-vt 0.8 0.2
-vn 0.0000 0.0000 -1.0000
-usemtl Shadow
-s off
-f 3/1/1 8/2/1 4/3/1
-f 7/4/1 6/5/1 8/2/1
-f 1/6/1 4/3/1 2/7/1
-f 5/8/1 2/7/1 6/5/1
-f 3/1/1 7/4/1 8/2/1
-f 7/4/1 5/8/1 6/5/1
-f 1/6/1 3/1/1 4/3/1
-f 5/8/1 1/6/1 2/7/1