GPU Heightmap sculpting in shader

i have successfully done the sculpting implementation on CPU,

throw some guide on how to do this on GPU kindly …

i have moved the sculpting code to vertex shader but the sculpting is not accumulating in vertex shader and cant modify position in vertex shader… kindly tell me how …

if (SculptMode.x == 1)//Raise
{ 
    float dist = length(int2(PickedPoint.xz) - input.position.xz);
    if (dist <= BrushRadius.x)
    {
        PositionOffset += (BrushRadius.y * (cos(PI * dist / float(BrushRadius.x)) + 1.0f) * 0.5f) * DeltaTime.x * 10.0f; 
        input.position.y = PositionOffset; 
    }
}

I am using RWTexture2D for it like ...

    if (SculptMode.x == 1)//Raise
    { 
        float dist = length(uint2(PickedPoint.xz) - input.position.xz);
        if (dist <= BrushRadius.x)
        { 
            PositionOffset[int2(input.position.xz)] += BrushRadius.y * smoothstep(0, BrushRadius.x, BrushRadius.x - dist) * DeltaTime.x * 10.0f;
        }
    }

but still my sculpting is in spike formation ...

then

input.position.y = PositionOffset[int2(input.position.xz)];