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Added same clipping mechanism to lines.

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juniperoserra
2005-04-19 07:31:53 +00:00
parent 38fc2d5225
commit e5ede6bbaa
2 changed files with 68 additions and 36 deletions
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97
processing/core/PGraphics3.java
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@@ -177,6 +177,9 @@ public class PGraphics3 extends PGraphics {
// on endFrame with all the triangles being depth sorted
protected int vertex_end;
// vertices may be added during clipping against the near plane.
protected int vertex_end_including_clip_verts;
// used for sorting points when triangulating a polygon
// warning - maximum number of vertices for a polygon is DEFAULT_VERTICES
int vertex_order[] = new int[DEFAULT_VERTICES];
@@ -792,6 +795,7 @@ public class PGraphics3 extends PGraphics {
public void endShape() {
vertex_end = vertexCount;
vertex_end_including_clip_verts = vertex_end;
// don't try to draw if there are no vertices
// (fixes a bug in LINE_LOOP that re-adds a nonexistent vertex)
@@ -801,6 +805,36 @@ public class PGraphics3 extends PGraphics {
}
// ------------------------------------------------------------------
// 2D or 3D POINTS FROM MODEL (MX, MY, MZ) TO CAMERA SPACE (VX, VY, VZ)
// It is necessary to do this now because we will be clipping them on
// add_triangle.
for (int i = vertex_start; i < vertex_end; i++) {
float vertex[] = vertices[i];
vertex[VX] =
modelview.m00*vertex[MX] + modelview.m01*vertex[MY] +
modelview.m02*vertex[MZ] + modelview.m03;
vertex[VY] =
modelview.m10*vertex[MX] + modelview.m11*vertex[MY] +
modelview.m12*vertex[MZ] + modelview.m13;
vertex[VZ] =
modelview.m20*vertex[MX] + modelview.m21*vertex[MY] +
modelview.m22*vertex[MZ] + modelview.m23;
vertex[VW] =
modelview.m30*vertex[MX] + modelview.m31*vertex[MY] +
modelview.m32*vertex[MZ] + modelview.m33;
// normalize
if (vertex[VW] != 0 && vertex[VW] != ONE) {
vertex[VX] /= vertex[VW];
vertex[VY] /= vertex[VW];
vertex[VZ] /= vertex[VW];
}
vertex[VW] = ONE;
}
// ------------------------------------------------------------------
// CREATE LINES
@@ -960,38 +994,6 @@ public class PGraphics3 extends PGraphics {
}
}
// ------------------------------------------------------------------
// 2D or 3D POINTS FROM MODEL (MX, MY, MZ) TO CAMERA SPACE (VX, VY, VZ)
// It is necessary to do this now because we will be clipping them on
// add_triangle.
for (int i = vertex_start; i < vertex_end; i++) {
float vertex[] = vertices[i];
vertex[VX] =
modelview.m00*vertex[MX] + modelview.m01*vertex[MY] +
modelview.m02*vertex[MZ] + modelview.m03;
vertex[VY] =
modelview.m10*vertex[MX] + modelview.m11*vertex[MY] +
modelview.m12*vertex[MZ] + modelview.m13;
vertex[VZ] =
modelview.m20*vertex[MX] + modelview.m21*vertex[MY] +
modelview.m22*vertex[MZ] + modelview.m23;
vertex[VW] =
modelview.m30*vertex[MX] + modelview.m31*vertex[MY] +
modelview.m32*vertex[MZ] + modelview.m33;
// normalize
if (vertex[VW] != 0 && vertex[VW] != ONE) {
vertex[VX] /= vertex[VW];
vertex[VY] /= vertex[VW];
vertex[VZ] /= vertex[VW];
}
vertex[VW] = ONE;
}
// ------------------------------------------------------------------
// CREATE TRIANGLES
@@ -1073,7 +1075,7 @@ public class PGraphics3 extends PGraphics {
// ------------------------------------------------------------------
// POINTS FROM CAMERA SPACE (VX, VY, VZ) TO SCREEN SPACE (X, Y, Z)
for (int i = vertex_start; i < vertex_end; i++) {
for (int i = vertex_start; i < vertex_end_including_clip_verts; i++) {
float vx[] = vertices[i];
float ox =
@@ -1126,8 +1128,33 @@ public class PGraphics3 extends PGraphics {
pathCount++;
}
protected void add_line(int a, int b) {
add_line_with_clip(a, b);
}
protected final void add_line(int a, int b) {
protected final void add_line_with_clip(int a, int b) {
float az = vertices[a][VZ];
float bz = vertices[b][VZ];
if (az > cameraNear) {
if (bz > cameraNear) {
return;
}
int cb = interpolate_clip_vertex(a, b);
add_line_no_clip(cb, b);
return;
}
else {
if (bz <= cameraNear) {
add_line_no_clip(a, b);
return;
}
int cb = interpolate_clip_vertex(a, b);
add_line_no_clip(a, cb);
return;
}
}
protected final void add_line_no_clip(int a, int b) {
if (lineCount == lines.length) {
int temp[][] = new int[lineCount<<1][LINE_FIELD_COUNT];
System.arraycopy(lines, 0, temp, 0, lineCount);
@@ -1276,7 +1303,7 @@ public class PGraphics3 extends PGraphics {
vertex(pa * va[MX] + pb * vb[MX], pa * va[MY] + pb * vb[MY], pa * va[MZ] + pb * vb[MZ]);
int irv = vertexCount - 1;
vertex_end++;
vertex_end_including_clip_verts++;
float[] rv = vertices[irv];
rv[X] = pa * va[X] + pb * vb[X];