Added TessUpdate demo

codeanticode · codeanticode · commit 66aaa12ebbc0 · 2022-03-08T09:58:40.000-05:00
diff --git a/Demos/Graphics/TessUpdate/TessUpdate.pde b/Demos/Graphics/TessUpdate/TessUpdate.pde
@@ -0,0 +1,64 @@
+// TessUpdate, by Andres Colubri
+// The begin/endTessallation API in Processing 4
+// enables dynamic modification of PShape objects.
+
+PShape group;
+
+int numBoxes = 100000;
+float boxSize = 2;
+
+PMatrix3D mat = new PMatrix3D();
+  
+int fcount, lastm;
+float frate;
+int fint = 3;  
+  
+void setup() {
+  size(600, 600, P3D);
+  noSmooth();
+
+  noStroke();
+  group = createShape(GROUP);
+    
+  for (int i = 0; i < numBoxes; i++) {
+    PShape s = createShape(BOX, boxSize, boxSize, boxSize);
+    s.setFill(#F5CB40);
+    s.translate(random(-width/2, width/2), random(-height/2, height/2), random(-1000, 1000));
+    group.addChild(s);
+  } 
+}
+  
+void draw() {
+  background(0);
+  lights();
+  PVector v = new PVector();
+
+  // PShape.set*() calls between beginTessellation() and endTessellation
+  // will modify the tessellated geometry directly, so this should result
+  // better performance for shapes that change dynamically during drawing
+  group.beginTessellation(TRIANGLES);
+  // getChildCount() returns number of vertices in the tessellated geometry,
+  // which could be different from the original number of vertices in the shape.
+  for (int ci = 0; ci < group.getChildCount(); ci++) {
+    PShape child = group.getChild(ci);
+    float rx = random(-1, 1);
+    float ry = random(-1, 1);
+    float rz = random(-1, 1);        
+    for (int vi = 0; vi < child.getVertexCount(); vi++) {
+      child.getVertex(vi, v);
+      v.x += rx;
+      v.y += ry;
+      v.z += rz;
+      child.setVertex(vi, v.x, v.y, v.z);
+    }
+  }
+  group.endTessellation();
+
+  translate(width/2, height/2, 0);
+  rotateY(frameCount * 0.001);
+  rotateX(frameCount * 0.001);
+  shape(group);
+    
+  String txt = String.format("FPS: %6.2fps", frameRate);
+  surface.setTitle(txt);
+}
