CUDA Ray-Tracing
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In this demo, your task is to implement shadow rays into the ray-tracing application using CUDA.

-) Go to "Source", and open the "CUDA RTRT.sln" file.
-) Build the solution (should build without problems in VS 2008)
-) Upon starting the program, you should see a ray-traced scene without any shadows.
-) A small menu can be opened with the right mouse button: Toggling to "With shadows" will not display shadows at this time - this needs to be implemented.


Task: Implement shadow rays in the following function:
static __device__ inline uint32_t shadow_kdtree(const ray_t &ray, float t_min, float t_max)

-) The source file for ray-tracing can be found in "Source/CUDA RTRT/rt_cuda_kernel.cu"
-) Your task is to implement the tracing of shadow rays in the abovementioned function
-) If implemented properly, switching to "With shadows" in the menu should now show shadows as well