The VRayScannedMtl material applies material information gathered by the Chaos Scans system to an object. The VRscans system captures the appearance of an actual physical material sample, going beyond single-point BRDF capture to faithfully represent the textured appearance of a real-world surface using bidirectional texture function (BTF) approximation. The information is saved in a .vrscan file, which the VRayScannedMtl material then reads to reproduce the material in the rendering.
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With V-Ray 6, the Scanned Material doesn't require a separate render from Chaos license to work correctly.
In earlier V-Ray versions, the Scanned Material requires a separate render license to work correctly. Without a license, the material renders with a watermark.
The VRscans system and VRayScannedMtl material are intended as a solution for users who need to exactly match a given real-world sample.
The scanned material simply stores information about the way a physical material responds to light at individual points on the surface; it has no notion of components that extend across the surface such as diffuse or reflection qualities, or normal or bump maps. The scanned material is simply a faithful representation of how each point on the object responds to light. The .vrscan files tend to be quite large.
For more details on Chaos Scans, please see the the Chaos Scans documentation.
