This image shows an example of some slightly earlier work, in which I used the principal directions and principal curvatures at evenly distributed points over an isosurface to define the orientation and length of a polygonally-defined solid stroke texture.   This texturing technique and its perceptual motivation are described in: Interrante, Fuchs and Pizer. "Conveying the 3D Shape of Smoothly Curving Transparent Surfaces via Texture", IEEE Transactions on Visualization and Computer Graphics, 3(2):98-117 (3.3M pdf) (HTML). This paper includes a detailed description of the controlled observer experiments that we conducted to evaluate the potential effectiveness of the principal direction texturing approach.

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