Use the Generic material whenever possible in your projects. This material is specifically optimized for V-Ray and often GI and lighting is computed much faster for V-Ray materials than for standard materials. Many V-Ray features (e.g. light cache, render elements) are guaranteed to work properly only with Generic and other V-Ray compliant materials.
The Generic material can produce reflections/refractions for matte objects - see Wrapper Material.
The 2D mapping method ignores the Tiling parameters specified in the textures themselves.
The 2D mapping (landscape) method only method only supports one UV mapping channel.
Materials with Normal opacity mode are now migrated to Stochastic opacity mode.
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Having a very large number of project objects using materials with 2D Displacement may substantially prolong the geometry compilation phase of the rendering process.Calculated in the default Revit unit - inches.
Prior to V-Ray Next, Update 1 the Fog Scattering section was known as Translucency.
