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Normal Displacement – Takes the original surface geometry and subdivides its triangles into smaller sub-triangles which are then displaced. It can be applied for arbitrary displacement maps with any kind of mapping.
Vector Displacement – If using a displacement texture that is not grayscale, V-Ray converts it to grayscale before rendering the displaced geometry. This mode allows V-Ray to use the Red, Green, and Blue channels of the displacement texture to displace the geometry in the U and V directions in addition to the direction of the face normal.
Vector Displacement (absolute) – A vector-type displacement mode in which the texture is interpreted as 0.5-based tangent space displacement map.
Vector Displacement (object)Only meaningful when a VRayPtex texture is used for displacement, where the texture The texture values represent 0-based displacement in object space. Recommended when a VRayPtex texture is used for displacement. If mesh information is stored in the Ptex file, V-Ray can also displace correctly mesh deformations.

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