#pragma kernel BlitBucket

Texture3D<float4> BucketBuffer;
SamplerState sampler_point_clamp;

float3 BucketOffset;
int BucketSize; 

RWTexture3D<float4> Result;

[numthreads(4,4,4)]
void BlitBucket(uint3 id : SV_DispatchThreadID)
{

    float3 UV = float3(id - BucketOffset) / BucketSize;
    float clip = step(UV.x,1) * step(UV.y, 1) * step(UV.z, 1) * 
                 step(0,UV.x) * step(0, UV.y) * step(0, UV.z);       

    uint3 bucketID = id.xyz - BucketOffset.xyz;

    Result[id.xyz] += BucketBuffer[bucketID] * clip;

}