[vtkusers] triangle strip and normals in vtk file

[Lisa Sobierajski Avila]

Hello Randy,



>1.  How can you specify a valid normal for a point - in a triangle strip
>it will be (posibly, unless coplanar) 2 different values depending on
>which triangle is associated with the node?

When you specify a normal per point you get Gouraud shading across the 
triangle.

>2. why do you need normals at all, aren't they implied by the winding
>order of the triangle strip?

You can rely on flat shading which will compute a normal per facet. Beware 
- strange results may occur with triangle strips when your data does not 
have normals, yet you specify Gouraud shading.

Lisa