[Plib-users] 3ds file load error

[Sharon <sha...@ya...>]

Hi, Steve,
I created the whole landscape(for a driving environment) in 3d max and exported it to a .3ds file, then I use ssgLoad3ds to load this file. The whole landscape is a NURBS surface. It's working fine until tonight after I added some vertexes to create a hill. I got this error: 
unhandled error in 0xC0000005: Access Violation.

I set the breakpoint and debugged the program. When I use plib 1.6, the error is in "*v3 = *( indices -> get ( vv3 ) ) ;" of this method in ssgVexArray.cxx:

void ssgVtxArray::getTriangle ( int n, short *v1, short *v2, short *v3 )
{
  short vv1, vv2, vv3 ;

  ssgVtxTable::getTriangle ( n, &vv1, &vv2, &vv3 ) ;

  *v1 = *( indices -> get ( vv1 ) ) ;
  *v2 = *( indices -> get ( vv2 ) ) ;
  *v3 = *( indices -> get ( vv3 ) ) ;
}
After I upgraded plib to 1.8.3, I got the exception in " tlist [ tnum*3+ 1 ] = v2 ;" of this method in ssgOptimiser.cxx:
short OptVertexList::add ( short v1, short v2, short v3 )
{
  if ( v1 == v2 || v2 == v3 || v3 == v1 ) /* Toss degenerate triangles */
  {
    vlist [ v1 ] -> dent () ; /* Un-reference their vertices */
    vlist [ v2 ] -> dent () ;
    vlist [ v3 ] -> dent () ;
    return -1 ;
  }
  
  tlist [ tnum*3+ 0 ] = v1 ;
  tlist [ tnum*3+ 1 ] = v2 ;
  tlist [ tnum*3+ 2 ] = v3 ;
  
  return tnum++ ;
}


The above error only happened when my 3ds file became more complex. I double if your 3ds parser could parse the very complex NURBS surfaces. I rendered my landscape in 3d max and the render result is correct.
 
Looking forward to your help.
 
Thanks.
 
Sharon
 

		
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