This example is for Processing 3+. If you have a previous version, use the examples included with your software. If you see any errors or have suggestions, please let us know.

Texture Triangle.

Using a rectangular image to map a texture onto a triangle.


PImage img;

void setup() {
  size(640, 360, P3D);
  img = loadImage("berlin-1.jpg");
  noStroke();
}

void draw() {
  background(0);
  translate(width/2, height/2, 0);
  rotateY(map(mouseX, 0, width, -PI, PI));
  beginShape();
  texture(img);
  vertex(-100, -100, 0, 0, 0);
  vertex(100, -40, 0, 300, 120);
  vertex(0, 100, 0, 200, 400);
  endShape();
}