Back in 3.7 Warp added warp{cubic} for patterns. Helpful in that df3 
density_file patterns so warped can be much flatter (smaller in size) 
and still result in deeper shapes/medias. Similar to other built in 
warps, one needs to offset in +z - after x, y and z normalization(1) - 
by the half width you want for the box centered on the origin.

Yep, the isosurface max_gradient for the attached image should have been 
set higher.

Bill P.

(1) - As with 2d images and image maps, 3d df3s - no matter their input 
dimensions - always fill the unit cube. Before warping one must do a 
normalization scale to get the thinner, as intended, 'shape' which is 
then offset in +z for size ahead of the warp{cubic}.

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