From jingwang_3 at yahoo.cn  Sat Jun 14 09:31:12 2008
From: jingwang_3 at yahoo.cn (Jing Wang)
Date: Sat, 14 Jun 2008 21:31:12 +0800 (CST)
Subject: [Pbrt-discuss] Surfce Normal
Message-ID: <226160.73127.qm@web92106.mail.cnh.yahoo.com>

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 


       
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