Optimizing the Rendering of Hair: Volume and Geometry Shaders: V Multiple BSP Trees *** See Figure chartmultibsps.jpeg BSP Tree Depth With Max Leaf Constant at 24 BSP Tree Depth / Time Depth = 10 / 0:34 Depth = 15 / 0:17 Depth = 18 / 00:15.5 Depth = 22 / 00:15.5 Depth = 26 / 0:17 *** See Figure chartbspdepth.jpeg BSP Tree optimation Depth Constant = 23 BSP Tree Leaf Size / Time 4 / 19.000 8 / 18.000 12 / 18.000 14 / 17.000 18 / 17.000 22 / 16.800 26 / 16.500 30 / 16.200 34 / 16.000 38 / 15.300 42 / 15.800 46 / 16.000 *** See Figure chartleafsize.jpeg Sanity Check, for BSP Depth again, this time with Max Leaf size = 38 BSP Tree Depth, with Max Leafsize = 38 10 / 34 15 / 17 18 / 15.5 22 / 15.5 26 / 17 ***See Figure HairRenderOptimization7.JPEG Conclusion to BSP Settings: For the default 6500 hairs, the settings Depth = 20 Max Leaf size 38 are pretty good