The 3D grid of control points for this shape
is less "disturbed" than the grid used for the
trivariate shape in my "A Trivariate NURBS
function" image posted here a couple of days
ago. (The random translation of the control
points away from a cube grid is less severe.)

I have divided the trivariate into 8 subpatches
in an attempt to show the "internals" of it.

The triangles are just simple triangle{} shapes.


Tor Olav

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