https://i.ytimg.com/vi/O-2K_aqQ2o4/hqdefault.jpg
For the render setting watch:
Simple and fast tutorial for create caustics in Blender Cycles Render
source
https://i.ytimg.com/vi/O-2K_aqQ2o4/hqdefault.jpg
For the render setting watch:
Simple and fast tutorial for create caustics in Blender Cycles Render
source