Hi

The attached animation shows 5 x 3 = 15 animated bivariate patches.
Each patch is drawn "within" a trivariate (u, v, w) whose control grid consists
of 3x3x3 = 27 points.

Each patch is drawn by varying both the v and w parameters of the trivariate
from 0.0 to 1.0, while the animation clock, running from 0.0 to 1.0, is
controlling the u parameter.

This is analogous to what happens in this animation:
https://dataduppedings.no/subcube/POV-Ray/NURBS-Quadrivariate_Deformation.mpg

Here all the boxes are drawn "within" a quadrivariate (u, v, w, t), where the
animation clock controls the t parameter.

--
Tor Olav
http://subcube.com
https://github.com/t-o-k

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Attachments:
Download 'trivariaterationalbezierpatches.mp4.dat' (3441 KB)