Hi guys,

I'm working at something, that I need for work. I'm was never working with the textures before, so I need a hand. I'm trying to map an image (whichever) onto another image. Like a layers in Photoshop. But if you do this in PS, it works with straight lines like a charm.
Example PS: http://www.qcomp.sk/imgcache/116/big/mNX.V7PEC.012_b.jpg
Example Processing: http://www.pcmaster.sk/photo_test.jpg

Code:

1. size(1200, 1000, P3D); textureMode(NORMAL);
   PImage under = loadImage("http://www.bilgisayar-destek.com/wp-content/uploads/2012/07/TravelMate-B113-2.jpg");
   under.resize(width, height);
   PImage img = loadImage("http://images.pcworld.com/images/article/2012/03/windows-8-metro-11329918.jpg");
   noStroke();
   image(under,0,0);
   beginShape(); texture(img);
   vertex(498, 62, 0, 0);
   vertex(1111, 168, 1, 0);
   vertex(1015, 595, 1, 1);
   vertex(413, 443, 0, 1);
   endShape();
   

My code is actually lot more complex, but this will do. I'll be very glad, if someone can help me with this.
Thanks