From: Brian Furtaw (brian++at++sgi.com)
Date: 05/04/2001 04:20:00
"Dorosky, Christopher G" wrote:
>
> I have a few questions on packed attributes that I was hoping someone could
> answer.
>
> 1. It seems that every packed attribute must be bound per vertex. Is this
> true?
In Performer this is true. If you look at the OpenGL man page for
glVertexPointer you will see a list of vertex array formats the Infinite
Reality has been optimized for.
> 2. There are two similiar modes, something like C4UBN3FT2FV3F and
> C4UBN3FTSV3F.... I'm sure I screwed it up, but the important part is that
> the letters after the texture coordinates are either "2F" for 2 floats, or
> "S" (possibly 2S) for ??? What does the S mean? The header talks about
> GEN_FORMAT.
The 2F is as you guessed 2 floats per texture coordinate the 2S is for 2
shorts per texture coord. So the first string translates to Color RGBA
order 1 unsigned byte Normal 3 floats Texcoords 2 floats Vertex 3
floats. The second string is
Color RGBA order 1 unsigned byte Normal 3 floats Texcoords 2 shorts
Vertex 3 floats.
> 3. It seems that you have to set all packed attrs, attributes on the gset to
> NULL, except COORD3. What is special about this?
I am not following you here do you have some code?
Brian
>
> This is all on Performer 2.2.10.
>
> Thanks
>
> Christopher Dorosky
> Lead Electronic Systems Engineer - Real Time Simulation
> Lockheed Martin Missiles and Fire Control - Dallas
> christopher.g.dorosky++at++lmco.com
> 972-603-2349
>
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