Hi.  I'm having some problems using the 3D library, and am hoping someone can point me in the right direction.  

What I want to do is pull in an image from the webcam, display it, and then superimpose another image that I can rotate in 3D.  Basically, it's like this texture example (http://processing.org/learning/3d/texture1.html), but with an additional texture (a fixed one taken from the webcam).

I've gotten really close, but for some reason, when I superimpose the smaller image, it gets cut in half.  If I comment out the section that draws the webcam image, the superimposed image works fine.  So, I'm thinking there's something I'm missing.  

Any help greatly appreciated!!!  

Code:

import processing.opengl.*;
import processing.video.*;

Capture cam; //Set up the camera

int WIDTH = 640;
int HEIGHT = 480;

PImage img, camCapture;

int imgX = WIDTH/2;
int imgY = HEIGHT/2;
int imgH, imgW;

void setup() {
  size(WIDTH, HEIGHT, P3D);
  img = loadImage("http://covers.oreilly.com/images/0636920000617/cat.gif");
  imgW = img.width;
  imgH = img.height;
  cam = new Capture(this, WIDTH, HEIGHT);
  noStroke();
}

void draw() {
  if (cam.available() == true) {
    cam.read();
  }
  //  
  background(0);
  //Draw the webcam pic
  pushMatrix();
  beginShape();
  texture(cam);
  vertex(0,0,0,0,0);
  vertex(WIDTH,0,0,WIDTH,0);
  vertex(WIDTH,HEIGHT,0,WIDTH,HEIGHT);
  vertex(0,HEIGHT,0,0,HEIGHT);
  endShape();
  popMatrix();
  // Now superimpose the image
  pushMatrix();
  translate(imgX, imgY);
  rotateY(map(mouseX, 0, width, -PI, PI));
//  rotateX(map(mouseY, 0, height, -PI, PI));
  beginShape();
  texture(img);
  vertex(-imgW/2, -imgH/2, 0, 0, 0);
  vertex(imgW/2, -imgH/2, 0, imgW, 0);
  vertex(imgW/2, imgH/2, 0, imgW, imgH);
  vertex(-imgW/2, imgH/2, 0, 0, imgH);
  endShape();
  popMatrix();
}