Muscle Tree

float xoff;

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void setup(){

  size(640, 640);

  stroke(0, 150, 255, 100);

}

​

void draw(){

  background(0);

  translate(width/2, height - 60);

  branch(160);

}

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void branch(float len){

  float t = map(len, 1, 160, 1, 30);

  float angle = sin(radians(xoff+len)) * 5;

  float theta = mouseX - width/2;

  strokeWeight(t);

  fill(0, 150, 255, 100);

  bezier(0, 0, 0, 0, -t*2, -t*2, 0, -len);

  bezier(0, 0, 0, 0, t*2, -t*2, 0, -len);

  fill(255);

  ellipse(0, 0, t, t);

  translate(0, -len);

  if(len > 5){

    pushMatrix();

    rotate(radians(theta+angle));

    branch(len * 0.618);

    popMatrix();

    pushMatrix();

    rotate(radians(-theta+angle));

    branch(len * 0.618);

    popMatrix();

  }

  xoff += 0.005;

}

​

​