Curvature 3D

For radial curvatures to be calculated (and therefore for this modifier to have any effect), the Face Smoothness option has to be turned on and the object needs to have Smooth Shading.

The limits of the mapping. If the current point of the stroke is at Min Curvature or less from the target, it will take the start point of the mapping, and conversely, if it is at Max Curvature or more from the target, it will take the end-point value of the mapping.

Curvature 3D modifier demo by T.K. ().