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#pragma glslify: snoise = require(glsl-noise/simplex/3d)

vec3 snoiseVec3( vec3 x ){

  float s  = snoise(vec3( x ));
  float s1 = snoise(vec3( x.y - 19.1 , x.z + 33.4 , x.x + 47.2 ));
  float s2 = snoise(vec3( x.z + 74.2 , x.x - 124.5 , x.y + 99.4 ));
  vec3 c = vec3( s , s1 , s2 );
  return c;

}


vec3 curlNoise( vec3 p ){
  
  const float e = .1;
  vec3 dx = vec3( e   , 0.0 , 0.0 );
  vec3 dy = vec3( 0.0 , e   , 0.0 );
  vec3 dz = vec3( 0.0 , 0.0 , e   );

  vec3 p_x0 = snoiseVec3( p - dx );
  vec3 p_x1 = snoiseVec3( p + dx );
  vec3 p_y0 = snoiseVec3( p - dy );
  vec3 p_y1 = snoiseVec3( p + dy );
  vec3 p_z0 = snoiseVec3( p - dz );
  vec3 p_z1 = snoiseVec3( p + dz );

  float x = p_y1.z - p_y0.z - p_z1.y + p_z0.y;
  float y = p_z1.x - p_z0.x - p_x1.z + p_x0.z;
  float z = p_x1.y - p_x0.y - p_y1.x + p_y0.x;

  const float divisor = 1.0 / ( 2.0 * e );
  return normalize( vec3( x , y , z ) * divisor );

}

#pragma glslify: export(curlNoise)

vec3 snoiseVec3( vec3 x ){

	x 		+= u_transform;

	float s  = TDSimplexNoise(vec3( x ));
	float s1 = TDSimplexNoise(vec3( x.y - 19.1 , x.z + 33.4 , x.x + 47.2 ));
	float s2 = TDSimplexNoise(vec3( x.z + 74.2 , x.x - 124.5 , x.y + 99.4 ));
	vec3 c = vec3( s , s1 , s2 );
	return c;

}


vec3 curlNoise( vec3 p ){
	
	const float e = .1;
	vec3 dx = vec3( e   , 0.0 , 0.0 );
	vec3 dy = vec3( 0.0 , e   , 0.0 );
	vec3 dz = vec3( 0.0 , 0.0 , e   );

	vec3 p_x0 = snoiseVec3( p - dx );
	vec3 p_x1 = snoiseVec3( p + dx );
	vec3 p_y0 = snoiseVec3( p - dy );
	vec3 p_y1 = snoiseVec3( p + dy );
	vec3 p_z0 = snoiseVec3( p - dz );
	vec3 p_z1 = snoiseVec3( p + dz );

	float x = p_y1.z - p_y0.z - p_z1.y + p_z0.y;
	float y = p_z1.x - p_z0.x - p_x1.z + p_x0.z;
	float z = p_x1.y - p_x0.y - p_y1.x + p_y0.x;

	const float divisor = 1.0 / ( 2.0 * e );
	return normalize( vec3( x , y , z ) * divisor );

}