Le_Forgeron <jgr### [at] freefr> wrote:
> 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).

Thanks!

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