varying float LightIntensity;
varying vec3  MCposition;

uniform sampler3D Noise3;
uniform float Amplify;
uniform vec4 Color1;
uniform vec4 Color2;
uniform float NoiseScale;
uniform float Turbulent;

void main()
{
	vec4 nv = texture3D(Noise3, MCposition * NoiseScale);

	float sum;
	if( Turbulent > 0.5 )
	{
		sum = abs(nv[0]-.5) + abs(nv[1]-.5)  + abs(nv[2]-.5)  + abs(nv[3]-.5);
	}
	else
	{
		sum = nv[0] + nv[1] + nv[2] + nv[3];
		sum = ( sum - 1. ) / 2.;
	}

	sum    = clamp(sum * Amplify, 0.0, 1.0);	
	vec3 color   = mix(Color1.rgb, Color2.rgb, sum) * LightIntensity;

	gl_FragColor = vec4(color, 1.0);
}