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Each plugin instance is defined on a new line starting with its type name follow by a space, an instance name, another space and an opening curly brace.
Each parameter is written on a new line with its name, an equals sign with no whitespace on both sides and a value. The line ends with a semicolon. A parameter definition line may be split into multiple lines for long values such as lists.
References to other plugins are defined by writing our out their instance names without quotation. Output parameters are specified the same way with additional double colon and parameter name (instance_name::out_param_name).
The end of the plugin definition is marked with a closing brace on a new line.
C++ style single line comments are supported.
Files can be stitched together with an #include "another.vrscene" directive like in C.
References can be made to plugins which will be defined further down the file.

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MtlSingleBRDF - The main material type that needs to be connected to Node::material.
Mtl2Sided
MtlGLSL
MtlMaterialID
MtlMulti
MtlOverride
MtlRenderStats
MtlRoundEdges
MtlSingleBRDF
MtlToon - unused, why?
MtlVRmat
MtlWrapper
- Defines a (possibly different) material for the back side of triangles, as well as the front sides.
MtlMulti - Use this together with GeomStaticMesh::face_mtlIDs to set different materials for subsets of triangles on one geometric object.
MtlVRmat - Load a V-Ray shader from a .vrmat (formerly .vismat) file. Also supports loading MtlSingleBRDF materials from vrscene files. This is used for transferring materials between different host applications.
MtlGLSL - Loads a GLSL shader from file and provides some parameters for it.
MtlOSL - Loads an OSL shader from file and provides some parameters for it.
MtlRoundEdges - Smooths sharp edges within a given radius by modifying normals.

Some advanced materials:

MtlMaterialID - Can be used to define a unique color for a specific base material to be used in compositing from a dedicated render channel.
MtlOverride - Allows you to override the base material for any of the following: reflections, refractions, GI, shadows, environment.
MtlRenderStats - Overrides visibility and shadow settings for the object using a base material. This material is not to be used nested in bump, wrapper, two-sided or blend materials.
MtlWrapper - (really advanced) Can be used to specify additional surface properties per material related to GI, render elements etc.

BRDF plugins for the materials:

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