This example implements curvature-based LIC using two separate Diderot
programs.  The first implements a raycast to find the isosurface, which
produces a 2D grid of 3D points.  The second program computes the 3D LIC
using a 2D noise texture.

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produces a 2D grid of 3D points.  The second program computes the 3D LIC
using a 2D noise texture.</div>
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