RE: [Plib-devel] Q1: Shared vertex data

[Vallevand, M. K <Mar...@UN...>]

-----Original Message-----
From: Dave McClurg [mailto:Dav...@dy...]
Sent: Monday, May 08, 2000 12:03 PM
To: 'pli...@li...'
Subject: RE: [Plib-devel] Q1: Shared vertex data



> When I looked at vertex arrays, it was not clear to me how 
> they could even be used to share vertex data, which is my 
> aim. 
> 
http://www.sgi.com/software/opengl/examples/redbook/source/varray.c
<http://www.sgi.com/software/opengl/examples/redbook/source/varray.c>   

 

DOH!

I get it now... 

> I don't have the SSG source code to quickly look at, but 
> I thought that ssgVtxTable used vertex arrays.  It seems 
> like a natural fit. 
> 
ssgVtxTable stores the vertex data in an array but passes it 
to OpenGL via glVertex 

  glBegin ( gltype ) ; 
  for ( i = 0 ; i < num_vertices ; i++ ) 
    glVertex3fv ( vx [ i ] ) ; 
  glEnd () ; 

This is nice and straight-forward but not exactly optimal for large models. 
A seperate class, using vertex arrays, would be a useful addition to SSG.  

 

This might be worth looking at.  Hmm, Hmm.  You could use the 

existing SSG collection classes.  A class named ssgVtxArray, or

some such thing.  Hmm.  Let me play with the idea for a while.

--Dave  


 
 

Regards. 
Mark K Vallevand   ma...@rs... 
Outside of a dog, a book is man's best friend. 
 Inside of a dog, its too dark to read.  - Groucho