Le 29/07/2013 19:23, LanuHum nous fit lire :
> Hi!
> My problem - uv vectors in bicubic patch.
> There are vertices, there are pixel on the picture. How to calculate a
> UV-vector?
> Why it is difficult? Point 3D(x,y,z) in object == point 2D(x,y) in picture.What
> vectors?

Have you read :

> http://wiki.povray.org/content/Documentation:Tutorial_Section_3#Bicubic_Patch_Object

A bicubic patch is a grid (uv) warped in the 3D (x,y,z).
The UV coordinates of the grid are not specified in the scene (but the
size of the grid can be changed).

> http://wiki.povray.org/content/Reference:UV_Mapping

The main problem with bicubic patch is the computation of nodes points
and control points (which push/pull intermediates points).

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