pfdGeoBuilder normal weirdness

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From: Tomlinson, Gordon (GORDON.TOMLINSON++at++ca.com)
Date: 11/01/2001 16:46:11

HI Folks

We are seeing a strange problem with the pfdGeoBuilder and normals.

The problem can be reduced to one triangle. If the triangle has a normal per-vertex and the normals are the same
for example {0,0,1},{0,0,1},{0,0,1} and we put this through the pfdGeoBuilder then the normals that come out the
other side are trashed and we end up with {0,0,0}

Now if we put a triangle through with different normal even slightly , for example {0,0,1},{0,0,0.99},{0,0, 0.98}
then the triangle normals that comes out of pfdGeoBuilder are correct.

Can anybody shed any light on this behaviour ? ( no pun intended ),

Thanks

Regards

Gordon.
_________________________________________________________________
Gordon Tomlinson

Development Manager
Urban Simulation Products.

MultiGen-Paradigm
"a Computer Associates Company"
Suite 200, 16415 Addison Road, Addison, TX 75001 USA

Tel: 972 380 9798 ext 309 Fax: 972 380 9468

Email: gordon.tomlinson++at++ca.com

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