[Download] Hdr Rendering Tutorial in vray for rhino
Asgvis offers a nice video tutorial.
This tutorial will show you how to use HDRI images (High Dynamic Range Images) to make realistic lighting.
Normal images can have lighting from 0 to 255. HDR images can have a much higher range since it stores values differently. The main format of HDRI images are *.hdr and *.exr files.