Raytracing using Uniform Grids on GPU. The code uses the CUDA interface to parallelize the raytracing activity. The title is a slight misnomer as we don't use uniform grids everywhere. We use perspective grids for primary and shadow rays and uniform grids for reflection rays.
The work got published in Eugraphics Symposium on Parallel Graphics and Visualization and IEEE Transactions on Visualization and Computer Graphics. Also check the thesis which this work was part of.