@MitsubishiMagna Forget, I solved the problem




After this line → float2 shadowUV = lightPos.xy * 0.5f + 0.5f;
I should been write this → shadowUV.y = 1 - shadowUV.y;

@undefined thanks

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iko iko said:
If you want ray-tracing use Vortice instead of SharpDX

Thanks. I've noticed that Vortice is more updated than SharpDX. In additions, it seems quite “easy” to translate C++ code to C# code. Do you agree?

@JoeJ exactly, now I found correct solution

TVertexPT vertices[] = {
   {{-1.0f, -1.0f,  1.0f}, {0.0f, 1.0f}},
   {{ 1.0f, -1.0f,  1.0f}, {1.0f, 1.0f}},
   {{ 1.0f,  1.0f,  1.0f}, {1.0f, 0.0f}},
   {{-1.0f,  1.0f,  1.0f}, {0.0f, 0.0f}…

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