NightSkyBox (SkyBox render example)

//import processing.opengl.*;

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final static int X = 0, Y = 1, Z = 2, SIZE = 3, REDNESS = 4, BRIGHTNESS = 5;

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final static int LEN = 800;

final static int NUM = 50000;

final static int RAD = 1000;

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float[][] stars;

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void setup()

{

  size(LEN, LEN, P3D);//OPENGL);

  noStroke();

  frameRate(30);

  sphereDetail(5);

  stars = new float[NUM][5];

  for(int i = 0; i < stars.length; i++)

  {

    float p = random(-PI, PI);

    float t = asin(random(-1, 1));

    stars[i] = new float[] {

      RAD * cos(t) * cos(p), // X

      RAD * cos(t) * sin(p), // Y

      RAD * sin(t),          // Z

      random(2),             // SIZE

      random(100),           // REDNESS

      random(255)            // BRIGHTNESS

    };

  }

  perspective(TWO_PI / 4.0, 1.0, 1, RAD * 1.1);

}

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void draw()

{

  background(0);

  camera(0, 0, 0, 1, 0, 0, 0, 1, 0);

  switch(frameCount)

  {

    case 1: case 2: case 3: case 4: rotateY(frameCount * HALF_PI); break;

    case 5: rotateX(+HALF_PI); break;

    case 6: rotateX(-HALF_PI); break;

    case 7: println("Done."); exit(); return;

  }

  println("Rendering frame " + frameCount + "...");

  for(int i = 0; i < stars.length; i++)

  {

    pushMatrix();

    float[] p = stars[i];

    translate(p[X], p[Y], p[Z]);

    fill(155 + p[REDNESS], 200, 255 - p[REDNESS], p[BRIGHTNESS]);

    sphere(p[SIZE]);

    popMatrix();

  }

//  save("sky-" + frameCount + ".png");

}

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