BouncySphere.pde

import peasy.*;

PeasyCam cam;

void setup() {
  size(600, 600, P3D);
  smooth(8);
  cam = new PeasyCam(this, 400);
}

float nPoints = 1000;
float R = 100;

float t = 0;
float xa = 0;
float c = 0;

float frac(float a) {
  return a - (float)Math.floor(a);
}

boolean on = false;

float nC = 20;
float nR = 200;
int cFrames = 0;
float delta = 0.03;
float nFrames = HALF_PI/delta;

void draw() {
  
  background(0);
  noFill();
  stroke(255);


  for (float k = 0; k < nC; ++k) {
    pushMatrix();
    
    float at = map(k, 0, nC, 0, TWO_PI);

    float cc = at+t;
    if (cc>=TWO_PI) {
      while(cc>=TWO_PI) cc-=TWO_PI;
    }
    float zz = map(cc, 0, TWO_PI, -HALF_PI, HALF_PI);
    translate(0, 0, sin(zz)*nR);
    R = cos(zz)*nR;
    xa = R/10.0*sin(k/10.0+4*t);

    c = map(sin(cos(zz) + t), -1, 1, 1, 5);
    colorMode(HSB);
    strokeWeight(2);
    //fill(map(sin(k/10.0 + t), -1, 1, 0, 255), 200, 200);
    stroke(238);

    beginShape();

    for (float i = 0; i < nPoints; ++i) {

      float an = map(i, 0, nPoints, 0, TWO_PI);
      float a  = map(i, 0, nPoints, 0, TWO_PI*2);

      float x = (R)*cos(an);
      float y = (R)*sin(an);
      float z = map(sin(a), -1, 1, -xa, xa);
      //float z = 0;
      //println(z);
      vertex(x, y, z);
    }
    // ellipse(0, 0, R, R);
    endShape(CLOSE);

    popMatrix();
  }
  
  if(on && cFrames < nFrames) {
    saveFrame("output/###.gif");
    cFrames += 1;
  }


  t += delta;
}

void keyPressed() {
  if(key =='s') {
    on = true;
  }
}