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BRDFVRayMtl also has a translucency option, but you should use BRDFSSS2 instead for subsurface scattering.

Important note on opacity: Many materials, including BRDFVRayMtl, have a separate opacity parameter slot (a value also known as "alpha", the inverse of transparency). Even if i.e. the diffuse parameter has some alpha values below 1.0, they will not have an effect. You need to separately connect for example TexBitmap::out_alpha to opacity. Also keep in mind that a material may look transparent even without any opacity set, because of the refraction layer.

Note: There are some material and BRDF plugins that still exist for compatibility reasons, but we don't recommend you use them. For example instead of connecting MtlDiffuse to a Node, you should create BRDFDiffuse -> MtlSingleBRDF::brdf -> Node::material. Plugins with names ending with "_ASGVIS" can also be ignored. We don't have an exhaustive list of deprecated plugins at the moment.

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