Added GetTessGroups demo

Author: codeanticode

Demos/Graphics/GetTessGroups/GetTessGroups.pde

@@ -0,0 +1,36 @@
+// GetTessGroups, by Andres Colubri
+// The getTessellation() function in Processing 4 returns a group shape 
+// where the first shape contains only the fill geometry, the second, 
+// the stroke lines, and third, only the points (if any).
+
+PShape box;
+PShape tess;
+
+boolean onlyStrokeLines = false;
+
+void setup() {  
+  size(600, 600, P3D);
+  
+  strokeWeight(5);
+  box = createShape(BOX, 200);
+  
+  tess = box.getTessellation();
+}
+
+void draw() {
+  background(180);
+  lights();
+  
+  translate(width/2, height/2);
+  rotateX(frameCount * 0.01);
+  rotateY(frameCount * 0.01);
+  for (int i = 0; i < tess.getChildCount(); i++) {    
+    if (!onlyStrokeLines || i == 1) {
+      shape(tess.getChild(i));
+    }
+  }
+}
+
+void keyPressed() {
+  onlyStrokeLines = !onlyStrokeLines;
+}