随机数与噪声的区别

float hash(vec2 p) {
  return fract(sin(dot(p, vec2(127.1, 311.7))) * 43758.5453);
}
float noise(vec2 p) {
  vec2 i = floor(p);
  vec2 f = fract(p);
  vec2 s = f * f * (3.0 - 2.0 * f);
  return mix(mix(hash(i), hash(i + vec2(1.0, 0.0)), s.x),
             mix(hash(i + vec2(0.0, 1.0)), hash(i + vec2(1.0)), s.x), s.y);
}

void main() {
  vec2 p = vUv * 8.000;
  float blocks = hash(floor(p));
  float n = mix(blocks, noise(p), 1.000);
  vec3 color = mix(vec3(0.06, 0.10, 0.14), vec3(0.48, 0.83, 0.69), n);
  gl_FragColor = vec4(color, 1.0);
}