https://garagefarm.net/en/vray/ - Learn the efficient way of using photon mapping in V-Ray for 3DS Max. Follow the instructions in this video and learn. Render your first VRay for 3ds Max using Photon Mapping at GarageFarm.NET.
Download the starting scene here for this tutorial.
https://www.vray.com/vray_for_3ds_max/tutorials/vray_for_3ds_max_tutorials/photon_mapping/cornell_box.zip
