You can't texture a box(), but you can very easily texture 6 quads using vertices and uv coordinates.

See the reference for relevant functions or take a look at: Examples > 3D > Textures > TextureCube

Well.. How do I use multiple textures on cube verticle?

Oh, and how can I disable smoothing with opengl

Two ways:

1. A single texture that holds all 6 sides, then your code will look exactly like the provided example only with different uv coordinates.
   
2. 6 different textures, where each texture is fully used on a single side.

If you want to learn more about this, google terms like: texture mapping or UV mapping.

If you mean multiple textures on a single side, then you could use a PGraphics or masking to composite one or more textures before applying them to the side.

So how can I use nearest neighbor for textures? They look bad

Something like this...

setTexParameteri(GL.GL_TEXTURE_MIN_FILTER,GL.GL_NEAREST);
setTexParameteri(GL.GL_TEXTURE_MAG_FILTER,GL.GL_NEAREST);

Try searching the forums. This has been asked before. It also depends which renderer and Processing version you are using. For example I believe GLGraphics (and supposedly then also the new opengl from Processing 2.0?) has some built-in functions for this as well.

Why not try the Shapes3D library it supports a number of 3D shapes that can be textured including a cube!

2. void TexturedCube(PImage _tex, int _x, int _y, int _z) {
3.   beginShape(QUADS);
4.   texture(_tex);
5. 
   
6.   // Given one texture and six faces, we can easily set up the uv coordinates
7.   // such that four of the faces tile "perfectly" along either u or v, but the other
8.   // two faces cannot be so aligned.  This code tiles "along" u, "around" the X/Z faces
9.   // and fudges the Y faces - the Y faces are arbitrarily aligned such that a
10.   // rotation along the X axis will put the "top" of either texture at the "top"
11.   // of the screen, but is not otherwised aligned with the X/Z faces. (This
12.   // just affects what type of symmetry is required if you need seamless
13.   // tiling all the way around the cube)
14.   
15.   // +Z "front" face
16.   vertex((_x)-1, (-_y)-1, (_z)+1, 0, 0);
17.   vertex((_x)+1, (-_y)-1, (_z)+1, 16, 0);
18.   vertex((_x)+1, (-_y)+1, (_z)+1, 16, 16);
19.   vertex((_x)-1, (-_y)+1, (_z)+1, 0, 16);
20. 
    
21.   // -Z "back" face
22.   vertex((_x)+1, (-_y)-1, (_z)-1, 0, 0);
23.   vertex((_x)-1, (-_y)-1, (_z)-1, 16, 0);
24.   vertex((_x)-1, (-_y)+1, (_z)-1, 16, 16);
25.   vertex((_x)+1, (-_y)+1, (_z)-1, 0, 16);
26. 
    
27.   // +Y "bottom" face
28.   vertex((_x)-1, (-_y)+1, (_z)+1, 0, 0);
29.   vertex((_x)+1, (-_y)+1, (_z)+1, 16, 0);
30.   vertex((_x)+1, (-_y)+1, (_z)-1, 16, 16);
31.   vertex((_x)-1, (-_y)+1, (_z)-1, 0, 16);
32. 
    
33.   // -Y "top" face
34.   vertex((_x)-1, (-_y)-1, (_z)-1, 0, 0);
35.   vertex((_x)+1, (-_y)-1, (_z)-1, 16, 0);
36.   vertex((_x)+1, (-_y)-1, (_z)+1, 16, 16);
37.   vertex((_x)-1, (-_y)-1, (_z)+1, 0, 16);
38. 
    
39.   // +X "right" face
40.   vertex((_x)+1, (-_y)-1, (_z)+1, 0, 0);
41.   vertex((_x)+1, (-_y)-1, (_z)-1, 16, 0);
42.   vertex((_x)+1, (-_y)+1, (_z)-1, 16, 16);
43.   vertex((_x)+1, (-_y)+1, (_z)+1, 0, 16);
44. 
    
45.   // -X "left" face
46.   vertex((_x)-1, (-_y)-1, (_z)-1, 0, 0);
47.   vertex((_x)-1, (-_y)-1, (_z)+1, 16, 0);
48.   vertex((_x)-1, (-_y)+1, (_z)+1, 16, 16);
49.   vertex((_x)-1, (-_y)+1, (_z)-1, 0, 16);
50. 
    
51.   endShape();
52. }

Help please!

Here you go. Tested and working in Processing 1.5.1.

Code Example

1. import processing.opengl.*;
2. import javax.media.opengl.GL;
3.  
4. PGraphics tex;
5. float rotx = PI/4;
6. float roty = PI/4;
7.  
8. String s1 = "http://minecraft-plus-plus.googlecode.com/svn-history/r30/trunk/Minecraft++/textures/grass_side.png";
9. String s2 = "http://minecraft-plus-plus.googlecode.com/svn-history/r30/trunk/Minecraft++/textures/grass.png";
10. String s3 = "http://minecraft-plus-plus.googlecode.com/svn-history/r30/trunk/Minecraft++/textures/dirt.png";
11.  
12. void setup() {
13.   size(640, 360, OPENGL);
14.   createTexture();
15.   noStroke();
16. }
17.  
18. void draw() {
19.   background(255);
20.   lights();
21.   translate(width/2, height/2, -100);
22.   rotateX(rotx);
23.   rotateY(roty);
24.   scale(90);
25.   GL gl = ((PGraphicsOpenGL)g).gl;
26.   gl.glTexParameterf(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MAG_FILTER, GL.GL_NEAREST);
27.   TexturedCube(tex);
28. }
29.  
30. void createTexture() {
31.   PImage t1 = loadImage(s1);
32.   PImage t2 = loadImage(s2);
33.   PImage t3 = loadImage(s3);
34.   tex = createGraphics(48,16,JAVA2D);
35.   tex.beginDraw();
36.   tex.image(t1,0,0);
37.   tex.image(t2,16,0);
38.   tex.image(t3,32,0);
39.   tex.endDraw();
40. }
41.  
42. void TexturedCube(PImage tex) {
43.   beginShape(QUADS);
44.   texture(tex);
45.   
46.   // +Z "front" face
47.   vertex(-1, -1,  1, 0, 0);
48.   vertex( 1, -1,  1, 16, 0);
49.   vertex( 1,  1,  1, 16, 16);
50.   vertex(-1,  1,  1, 0, 16);
51.  
52.   // -Z "back" face
53.   vertex( 1, -1, -1, 0, 0);
54.   vertex(-1, -1, -1, 16, 0);
55.   vertex(-1,  1, -1, 16, 16);
56.   vertex( 1,  1, -1, 0, 16);
57.  
58.   // +Y "bottom" face
59.   vertex(-1,  1,  1, 32, 0);
60.   vertex( 1,  1,  1, 48, 0);
61.   vertex( 1,  1, -1, 48, 16);
62.   vertex(-1,  1, -1, 32, 16);
63.  
64.   // -Y "top" face
65.   vertex(-1, -1, -1, 16, 0);
66.   vertex( 1, -1, -1, 32, 0);
67.   vertex( 1, -1,  1, 32, 16);
68.   vertex(-1, -1,  1, 16, 16);
69.  
70.   // +X "right" face
71.   vertex( 1, -1,  1, 0, 0);
72.   vertex( 1, -1, -1, 16, 0);
73.   vertex( 1,  1, -1, 16, 16);
74.   vertex( 1,  1,  1, 0, 16);
75.  
76.   // -X "left" face
77.   vertex(-1, -1, -1, 0, 0);
78.   vertex(-1, -1,  1, 16, 0);
79.   vertex(-1,  1,  1, 16, 16);
80.   vertex(-1,  1, -1, 0, 16);
81.  
82.   endShape();
83. }
84.  
85. void mouseDragged() {
86.   float rate = 0.01;
87.   rotx += (pmouseY-mouseY) * rate;
88.   roty += (mouseX-pmouseX) * rate;
89. }

http://www.mediafire.com/?36579x5wiyof0rb Here is the code, want it to be nearest neighbor texturing again

brokkoli, I already gave you a full working code example. Have you missed this?

Your code, besides not working as you want, is also inefficient because you load the same image multiple times.

I see that you have posted many threads and questions in the last week and show no gratitude towards the people who have helped you. I am wondering if this is a reflection of your personality or your age (since you mention going to school). Either way you should sort it out, because your attitude makes you come across like an ungrateful douchebag.

The reason for that is that I'm new to software programming and trying to figure out stuff on my own too.