OSG Newbie wrote:
Thanks, that helps.
In my situation, I have primitives sharing same vertex and the normals are
different for a vertex depending on the primitive. I guess
Geometry.setNormalBinding should be BIND_PER_PRIMITIVE.
My question is how should I order the normals in the normal array in Geometry,
or should I use Geometry.setNormalIndices() to specify the normal indices. If
so, should I set the indices in the order of how I set the primitives.
No, avoid per-list indices (as in setNormalIndices() ) like the plague.
They're a throwback to the early days of OpenGL, and they'll force you
to use immediate mode (glBegin(), glEnd()), which is the slowest way to
draw. The same thing goes for BIND_PER_PRIMITIVE.
The best way to accomplish what you're doing is to just duplicate the
vertex coordinates where you need different normal values, and use
BIND_PER_VERTEX for your normals. For example, if you're drawing a
cube, go ahead and use 24 separate vertex coordinates, normals and
texture coordinates (as opposed to 8 vertex/texture coordinates and 6
per-primitive normals). It may seem like extra work, but as you scale
to bigger and bigger scenes, it'll draw much faster this way.
--"J"
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