varying float LightIntensity; 
varying vec3  MCposition;

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

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


    float intensity = abs(noisevec[0] - 0.25) +
                      abs(noisevec[1] - 0.125) +
                      abs(noisevec[2] - 0.0625) +
                      abs(noisevec[3] - 0.03125);

    intensity    = clamp(intensity * 6.0, 0.0, 1.0);
    vec3 color   = mix(Color1.rgb, Color2.rgb, intensity) * LightIntensity;
    
    gl_FragColor = vec4(color, 1.0);
}