Just an question, this Marmoset Toolbag something simillar like the Quiexel ddo ? Or any differences between those stuffs ?
It's two completely different softwares. Quixel suite (nDO, dDO) is texture authoring package. It's creation tool.
Marmoset Toolbag is real-time content viewer, with material and lighting system.
Only thing they share is Computer/Video games oriented market, but there is no reason why you can't use them elsewhere.
I used Marmoset to quickly play with my normal maps for sculpted things I did in Zbrush, and I use nDO to create all my normal maps to be used for regular off-line rendering.
The PBR guide is excellent thing to go through, even though it can't be applied directly (unfortunately...) to Corona/any other renderer (with slight exception of Maxwell, which shares half the principles),
because Specular/Glossy workflow which we use (and which is subpar) is different from Metalness/Roughness workflow from general (Disney's)PBR model.
Still, you learn lot of important concepts:
1)Everything is darker in diffuse than we would think.
2)Things are more reflective then we think, and the surface specular reflection varies because of its roughness (inverted glossy parameter, but driving both intensity and spread) not because of specularity (single material surface is mostly even).
3)Metals do not have diffuse property, in pure form they only contain specular reflection. That's why metals and non-metals should be created in different manner.
