There are several was to do this.

You can use:

1. hint(ENABLE_DEPTH_TEST);
2. // 3D stuff
3. hint(DISABLE_DEPTH_TEST);
4. // 2D stuff
   

Hey Calsign,

No, you would use that with a 3D size declaration.
I'm sorry, but I don't quite understand your problem now...

If it helps, you might look at screenX() and screenY().

This question in a more generalized form (combining 3D and 2D) has been asked and answered dozens of times. Search the forum for those solutions.

It seems you already have a very specific solution in mind. So to answer your specific question... Toxiclibs is actually renderer-independent. The ToxiclibsSupport class makes it possible to render to a specific PGraphics. Which makes it possible to have a 2D sketch (JAVA2D) with a 3D PGraphics (P3D) and render all the Toxiclibs stuff into the latter. See the following...

Code Example

1. import processing.opengl.*;
2. import toxi.geom.*;
3. import toxi.geom.mesh.*;
4. import toxi.math.waves.*;
5. import toxi.processing.*;
6.  
7. ToxiclibsSupport gfx;
8. AABB cube;
9. AxisAlignedCylinder cyl;
10. Cone cone,cone2;
11. Sphere ball;
12. TriangleMesh mesh;
13. AbstractWave sphereRes=new SineWave(0,0.02,15,18);
14.  
15. PGraphics pg;
16.  
17. void setup() {
18.   size(600,600); // 2D renderer
19.   setup3D();
20.   smooth();
21. }
22.  
23. void draw() {
24.   // draw the 2D stuff
25.   background(255, 0, 0);
26.   noStroke();
27.   fill(0, 0, 255);
28.   ellipse(100, 100, 400, 400);
29.   fill(255, 255, 0);
30.   ellipse(400, 500, 400, 400);
31.   // draw the 3D stuff to a PGraphics
32.   draw3D();
33.   // draw the PGraphics image in the 2D renderer
34.   image(pg, 50, 50);
35. }
36.  
37. void setup3D() {
38.   pg = createGraphics(500, 500, P3D); // 3D PGraphics
39.   gfx = new ToxiclibsSupport(this, pg); // render to a PGraphics
40.  
41.   // example geometry
42.   cone = new Cone(new Vec3D(0,-50,0), new Vec3D(0,1,0), 50, 100, 50);
43.   cone2 = new Cone(new Vec3D(0,50,0), new Vec3D(0,-1,0), 50, 100, 50);
44.   cyl = new XAxisCylinder(new Vec3D(200,0,0),20,100);
45.   SurfaceFunction f = new SuperEllipsoid(0.3,0.3);
46.   mesh = (TriangleMesh) new SurfaceMeshBuilder(f).createMesh(null,40,50);
47.   mesh.transform(new Matrix4x4().translate(0,0,200));
48.   cube = new AABB(new Vec3D(0,0,-200),new Vec3D(50,50,50));
49.   ball = new Sphere(new Vec3D(-200,0,0),50);
50. }
51.  
52. void draw3D() {
53.   pg.beginDraw();
54.   pg.background(0);
55.   pg.lights();
56.   pg.translate(pg.width/2,pg.height/2,0);
57.   pg.rotateX(mouseY*0.01);
58.   pg.rotateY(mouseX*0.01);
59.   pg.noStroke();
60.   pg.endDraw();
61.  
62.   gfx.cone(cone,20,false);
63.   gfx.cone(cone2,20,true);
64.   gfx.mesh(mesh);
65.   gfx.box(cube);
66.   int res = (int) sphereRes.update();
67.   gfx.cylinder(cyl,res,false);
68.   gfx.sphere(ball,res);
69. }