processing4/java/examples/3D/Form/CubicGrid/applet/CubicGrid.java

import processing.core.*; 

import java.applet.*; 
import java.awt.*; 
import java.awt.image.*; 
import java.awt.event.*; 
import java.io.*; 
import java.net.*; 
import java.text.*; 
import java.util.*; 
import java.util.zip.*; 
import java.util.regex.*; 

public class CubicGrid extends PApplet {

/**
 * Cubic Grid 
 * by Ira Greenberg. 
 * 
 * 3D translucent colored grid uses nested pushMatrix()
 * and popMatrix() functions. 
 */

float boxSize = 40;
float margin = boxSize*2;
float depth = 400;
int boxFill;

public void setup() {
  size(640, 360, P3D);
  noStroke();
}

public void draw() {
  background(255);
  
  // Center and spin grid
  translate(width/2, height/2, -depth);
  rotateY(frameCount * 0.01f);
  rotateX(frameCount * 0.01f);

  // Build grid using multiple translations 
  for (float i =- depth/2+margin; i <= depth/2-margin; i += boxSize){
    pushMatrix();
    for (float j =- height+margin; j <= height-margin; j += boxSize){
      pushMatrix();
      for (float k =- width+margin; k <= width-margin; k += boxSize){
        // Base fill color on counter values, abs function 
        // ensures values stay within legal range
        boxFill = color(abs(i), abs(j), abs(k), 50);
        pushMatrix();
        translate(k, j, i);
        fill(boxFill);
        box(boxSize, boxSize, boxSize);
        popMatrix();
      }
      popMatrix();
    }
    popMatrix();
  }
}


  static public void main(String args[]) {
    PApplet.main(new String[] { "CubicGrid" });
  }
}