Initial Commit

Java/Processing/processing-3.3.6/modes/java/examples/Topics/Textures/TextureCube/TextureCube.pde

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+/**
+ * Texture Cube
+ * by Dave Bollinger.
+ * 
+ * Drag mouse to rotate cube. Demonstrates use of u/v coords in 
+ * vertex() and effect on texture(). The textures get distorted using
+ * the P3D renderer as you can see, but they look great using OPENGL.
+*/
+
+PImage tex;
+float rotx = PI/4;
+float roty = PI/4;
+
+void setup() {
+  size(640, 360, P3D);
+  tex = loadImage("berlin-1.jpg");
+  textureMode(NORMAL);
+  fill(255);
+  stroke(color(44,48,32));
+}
+
+void draw() {
+  background(0);
+  noStroke();
+  translate(width/2.0, height/2.0, -100);
+  rotateX(rotx);
+  rotateY(roty);
+  scale(90);
+  TexturedCube(tex);
+}
+
+void TexturedCube(PImage tex) {
+  beginShape(QUADS);
+  texture(tex);
+
+  // Given one texture and six faces, we can easily set up the uv coordinates
+  // such that four of the faces tile "perfectly" along either u or v, but the other
+  // two faces cannot be so aligned.  This code tiles "along" u, "around" the X/Z faces
+  // and fudges the Y faces - the Y faces are arbitrarily aligned such that a
+  // rotation along the X axis will put the "top" of either texture at the "top"
+  // of the screen, but is not otherwised aligned with the X/Z faces. (This
+  // just affects what type of symmetry is required if you need seamless
+  // tiling all the way around the cube)
+  
+  // +Z "front" face
+  vertex(-1, -1,  1, 0, 0);
+  vertex( 1, -1,  1, 1, 0);
+  vertex( 1,  1,  1, 1, 1);
+  vertex(-1,  1,  1, 0, 1);
+
+  // -Z "back" face
+  vertex( 1, -1, -1, 0, 0);
+  vertex(-1, -1, -1, 1, 0);
+  vertex(-1,  1, -1, 1, 1);
+  vertex( 1,  1, -1, 0, 1);
+
+  // +Y "bottom" face
+  vertex(-1,  1,  1, 0, 0);
+  vertex( 1,  1,  1, 1, 0);
+  vertex( 1,  1, -1, 1, 1);
+  vertex(-1,  1, -1, 0, 1);
+
+  // -Y "top" face
+  vertex(-1, -1, -1, 0, 0);
+  vertex( 1, -1, -1, 1, 0);
+  vertex( 1, -1,  1, 1, 1);
+  vertex(-1, -1,  1, 0, 1);
+
+  // +X "right" face
+  vertex( 1, -1,  1, 0, 0);
+  vertex( 1, -1, -1, 1, 0);
+  vertex( 1,  1, -1, 1, 1);
+  vertex( 1,  1,  1, 0, 1);
+
+  // -X "left" face
+  vertex(-1, -1, -1, 0, 0);
+  vertex(-1, -1,  1, 1, 0);
+  vertex(-1,  1,  1, 1, 1);
+  vertex(-1,  1, -1, 0, 1);
+
+  endShape();
+}
+
+void mouseDragged() {
+  float rate = 0.01;
+  rotx += (pmouseY-mouseY) * rate;
+  roty += (mouseX-pmouseX) * rate;
+}