I started using Vray to get some renders in sketchup, but I had many doubts about the features it offers is that some of them are:

• What are concrete values ​​GAMMA [bitmapbuffer] and alphaMultiplier [texbitmap] when using the option Bump or Displacement? What is its function and relationship between them? Since then they influence the value that will give the bump or displacement?

• Is that when I use the BUMP or displacement, the values ​​are always placed a lot of luck because I did not understand yet what its function then leads to poor results and disappointing. Any dictionary that explains each command?

Thank you!

SketchUp version: 8.0.3117
VRay version: 1.48.91