第 11 课：Cellular Noise

实现

uniform vec2 iResolution;
uniform float iTime;

vec2 points[9];

void init() {
  points[0] = vec2(0.05,0.15);
  points[1] = vec2(0.35,0.27);
  points[2] = vec2(0.78,0.04);

  points[3] =  vec2(0.25,0.46);
  points[4] = vec2(0.50,0.55);
  points[5] = vec2(0.91,0.37);

  points[6] = vec2(0.28,0.67);
  points[7] =  vec2(0.53,0.76);
  points[8] = vec2(0.73,0.75);
}

vec2 getPoint(int index) {
  return sin(points[index] * 6.28 + iTime / 3.0) * 0.5 + 0.5;
}

void main() {
  init();

  vec2 uv = gl_FragCoord.xy / iResolution.xy;

  float m_dist = 1.0;
  for(int i = 0; i < 9; i++){
    float newDist = distance(uv, getPoint(i));
    m_dist = newDist < m_dist ? newDist : m_dist;
  }

  gl_FragColor = vec4(0.0, m_dist * 2.25, 0.0, 1.0);
}