Argentieri, John-P63223 wrote:
Gentlemen,
Is there a way to force vertex B to have a different texture
coordinate in each of triangle ABC and triangle BCD?
Texture coordinate indices? I don't understand how those are applied.
If the binding is per_primitive, will each of my triangles be textured
by a single pixel?
PER_PRIMITIVE texture coordinates aren't allowed (only PER_VERTEX, or
none at all). Also, you don't want to use texture coordinate indices
because they'll knock you into immediate mode (slow) rendering.
The easy way to get what you're looking for is to have arrays like this:
vertex array: vA, vB, vC, vB, vC, vD
texcoord array: tA, tB1, tC, tB2, tC, tD
where tB1 != tB2
and use a DrawArrays primitive set (ie: don't use DrawElements). In
other words, just duplicate the vertex positions explicitly in your
vertex array, and make the corresponding texture coordinates whatever
you need them to be.
--"J"
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