About The Photon Mapping Part

Hi,it is my first time to use Opix.I am curious about photon mapping implimentation,could you tell me which sample include this part?
thank you :)

If you’re using OptiX 4.0.2, the progressive photon mapping example formerly shipping with the OptiX 3.x SDKs can now be found in an adapted version for OptiX 4.x on github.
Find the link in the sticky thread here: https://devtalk.nvidia.com/default/topic/998546/optix/optix-advanced-samples-on-github/

If you’re generally interested in photon mapping, I would recommend reading the publications from Toshiya Hachisuka http://www.ci.i.u-tokyo.ac.jp/~hachisuka/ and Henrik Wann Jensen http://graphics.stanford.edu/~henrik/papers/