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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