RenateOnVizoo3d
commented
5 years ago - Specular parameter: let's also clarify the behavior of specular. It says 0 - 1 in xTex with a default of 0.5 In Lotta it is 0 - 10. It seems that Lotta does not read the specular set from xTex. Also the behavior of specular over 1 seems way too strong to me compared with other tools.
vizoomartin
After testing U3M between xTex and Lotta this what I found. Please review the below and fix if you agree with it.
Vizoo xTex
Sheen tint is curently 1 but should be 0 by default (see documentation) https://github.com/vizoogmbh/u3m/blob/master/U3M.pdf
Specular tint is curently 1 but should be 0 by default (see documentation)
Metalness default constant is 1 but should be 0.
BrowZwear
The clearcoat in Lotta is affected by the underlying normal. According to the U3M documentation: The regular normal does only apply to the material, not to the clearcoat. Image example: https://docs.unrealengine.com/Images/Engine/Rendering/Materials/HowTo/ClearCoatDualNormal/Dual_CC_On.jpg If the clearcoat should be affected by a normal, we would need to introduce a clearcoat normal paramter.