[vtkusers] Per triangle texturing. Please help!!

[Tim Hutton]

Hi Godofredo,

VTK doesn't support per-face texturing natively. You can get the same
effect by splitting the vertices - duplicating them so that at a
junction between e.g. 6 triangles, there are 6 vertices, all with the
same spatial coordinates but different texture coordinates.

If you look in vtkOBJReader that's the approach it uses where
necessary, to read-in the OBJ format (which does support per-face
textures).

To manipulate the texture coordinates, just use
my_polydata->GetPointData()->GetTCoords().

Tim

On 03/09/07, Godofredo <godofredoiii at gmail.com> wrote:
>
> Sorry for replying myself but I'm frustrated. Another question I have: Is it
> possible to change Polydata point values in a vtkTextureMapToPlane? I've
> tried doing:
>  vtkTextureMapToPlane *planeMap = vtkTextureMapToPlane::New();
> planeMap->GetPolyDataOutput()->SetPoints(vPoints);
> Where vPoints is the new array of point values.
>
> But this doesn't seem to work at all.
>
>
> Godofredo wrote:
> >
> > Hi. I'm trying to add texture to a region of a 3d polydata. The texture is
> > a .jpeg file and the polydata is a triangulated point cloud. I would like
> > to know if it's possible to manually assign a region of the .jpeg image to
> > each triangle. I don't know if this can be done with the tcoords field.
> > Any guidance will be apreciated as I'm a bit stuck. Many thanks in
> > andvance
> >
>
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Tim Hutton - http://www.sq3.org.uk

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