Key Features
Adjust UV tiling – the .mtsc file stores information about the physical size of the scanned sample and by clicking on a point over a given object, the texture tiling is modified so that the texture is with the correct size for the clicked point
Plain materials strategy – simplifies the shading of the mterial and may help to reducing tiling artifacts
Filter color – this is a color multiplier for the material sample and can be used to tint the material
Information – the text field displays some useful information contained in the .mtsc file, like the actual material sample size.
Subdivision – controls how many reflection rays will be traced for the material. Note that the material does not have a "diffuse" or "reflection" component - everything is considered glossy reflection.
Trace depth – controls the number of reflection bounces. A value of -1 means that the reflections bounces are controlled by the global V-Ray trace depth in the Global switches rollout of the renderer settings.
Cut-off – a threshold that is used to speed up reflections. If the contribution of reflections falls below this threshold, the reflections are not traced. This is similar to the cut-off threshold of the VRayMtl material.
Glossy as GI – this parameter is useful for debugging purposes and is equivalent to the same setting in the VRayMtl material.
Coarse indirect – simplifies the calculations of the material when it is viewed through GI rays. In that case the Average BRDF method is used to shade the material (see above).
Uniform reflection distribution – when enabled, the material reflections are computed by sampling the hemisphere uniformly. When disabled, importance sampling is used to put more rays in directions where the material contribution is larger. Which method will perform better depends on the scene lighting and the particular material that is used.
IOR – determines the IOR of the coat layer and from that controls the strength of the reflections. A value of 1.0 does not produce any reflections and disables the coat layer. Higher values produce stronger clear coat reflections. The .mtsc files typically contain the correct value for this parameter and it is set automatically when the file is loaded.
Bump multiplier – the coat layer has a built-in bump map stored into the material sample file. This parameter allows to control the strength of that bump.