Unity ComputeShader implementation of BVH(Bounding Volume Hierarchy) based mesh hit checking.

Installation

Add the following address to UnitPackageManager.

https://github.com/fuqunaga/ComputeShaderBVHMeshHit.git?path=/Packages/ComputeShaderBVHMeshHit

How to use

Create BVH Asset

1. Window > BvhBuilder
2. Set meshObjectRoot object.
3. Build to create BvhAsset.

C#

1. Put BvhHelperBehaviour to the Hierarchy.
2. Set BvhAsset.
3. Call BvhHelperBehaviour.SetBuffersToComputeShader().

ComputeShader

1. Add the following include statement to your ComputeShader.
   #include "Packages/ga.fuquna.computeshaderbvhmeshhit/Bvh.hlsl"
2. Call TraverseBvh() to detect a mesh hit.

References

• http://raytracey.blogspot.com/2016/01/gpu-path-tracing-tutorial-3-take-your.html
• http://marupeke296.com/COL_3D_No18_LineAndAABB.html
• https://shikousakugo.wordpress.com/2012/06/27/ray-intersection-2/