pattern xyy.glsl

pattern xyy.glsl

  const float MY_PI = 3.14159265;
      const float MY_SCALE = 1.0;
      const mat3 m = mat3(
        cos(MY_PI * MY_SCALE), -sin(MY_PI * MY_SCALE), 0.0,
        sin(MY_PI * MY_SCALE),  cos(MY_PI * MY_SCALE), 0.0,
        0.0,  0.0, 1.0
      );

      float noise( in vec3 p ) {
        return cos(p.x) * sin(p.y) * cos(p.z);
      }

      float fbm4( vec3 p ) {
          float f = 0.0;
          f += 0.5000 * noise( p ); p = m * p * 2.02;
          f += 0.2500 * noise( p ); p = m * p * 2.03;
          f += 0.1250 * noise( p ); p = m * p * 2.01;
          f += 0.0625 * noise( p );
          return f / 0.9375;
      }

      float fbm6( vec3 p ) {
          float f = 0.0;
          f += 0.500000*(0.5 + 0.5 * noise( p )); p = m*p*2.02;
          f += 0.250000*(0.5 + 0.5 * noise( p )); p = m*p*2.03;
          f += 0.125000*(0.5 + 0.5 * noise( p )); p = m*p*2.01;
          f += 0.062500*(0.5 + 0.5 * noise( p )); p = m*p*2.04;
          f += 0.031250*(0.5 + 0.5 * noise( p )); p = m*p*2.01;
          f += 0.015625*(0.5 + 0.5 * noise( p ));
          return f/0.96875;
      }

      float pattern (vec3 p) {
        float vout = fbm4( p + time + fbm6(  p + fbm4( p + time )) );
        return abs(vout);
      }