[Pbrt-discuss] Surfce Normal

[Jing Wang]

Hi:
  I am new to PBRT. I see that the normal must point to the outside of 
the shape. However, for the triangle mesh, I don't see this is 
ensured. For example, suppose (u,v) is not provided, the system 
generate the default (u,v) values, it is possible that nn = 
Normal(Normalize(Cross(dpdu, dpdv))) defined in DifferentialGeometry 
constructor will get the wrong constructor. 
Can anybody help me? 
Thanks a lot.
  Jing 


       
---------------------------------
 雅虎邮箱，您的终生邮箱！
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://six.pairlist.net/pipermail/pbrt-discuss/attachments/20080614/4ca7f9af/attachment.htm>