VRayCurvature

VRayCurvature is a texture that effectively samples the underlying mesh, and renders a gradient based on a surface's curvature.

A region around each shaded point is sampled with additional rays (similar to VRayDirt) and all additional normals are averaged to get a "smooth" normal at the original point. This normal is used to compute the resulting color, which depends on the Mode of the map. The parameters should be adjusted by trial and error since they generally depend on the radius used, hence the defaults might not be appropriate in some cases.

Mode – Switches between respective modes. See the Curvature Modes example below for more information.

Legacy – Does not distinguish if the mesh is curving outward (convex) or inward (concave) but instead takes into account only the amount of overall curvature.
Convex – Generates a grayscale based on the mesh's outward curve.
Concave – Generates a grayscale based on the mesh's inward curve.
Both – Generates a red-green gradient based on both the mesh's convex and concave. Red corresponds to the mesh's convex and green corresponds to the mesh's concave.

Subdivs – Controls the number of samples around each shaded point.

Sample spread – Controls the radius of the sampled region. See the Sample Spread example below for more information.

Radius – Factor determining the radius that the curvature traces. Can be used to match curvature between big and small objects.

Ignore bump – Excludes Bump maps from VRayCurvature computations. See the Ignore Bump example below for more information.

Output min color – Specifies the minimum output color value for the most concave area (the dents in the mesh). Default value is 0 - completely black. See the Output Min and Max Color below for more information.

Output max color – Specifies the maximum output color value for the most convex area (the peaks in the mesh). Default value is 1 - white. See the Output Min and Max Color below for more information.

Output gain – Multiplies the output values. See the Output gain example below for more information.

Output lift – Uniformly lightens the output values.

Output gamma – Applies gamma correction to the output values.

Output pivot – Pivots the value to the gamma correction (output values equal to the pivot value are left unchanged).

Output clamp – Clamps the Output min color and Output max color values in [0,1] range (negative values are output as 0 and values above 1 are being output as 1).