Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!swrinde!cs.utexas.edu!uwm.edu!linac!att!news.cs.indiana.edu!ux1.cso.uiuc.edu!mrlaxa.mrl.uiuc.edu!andreess
From: andreess@mrlaxa.mrl.uiuc.edu (Marc Andreessen)
Newsgroups: comp.sys.sgi
Subject: Re: swapinterval & tmesh
Message-ID: <1991Apr28.090720.9509@ux1.cso.uiuc.edu>
Date: 28 Apr 91 09:07:20 GMT
References: <15121@darkstar.ucsc.edu>
Sender: usenet@ux1.cso.uiuc.edu (News)
Organization: University of Illinois, Urbana
Lines: 19

In article <15121@darkstar.ucsc.edu> mmcohen@fuzzy (Dr. Michael M. Cohen) writes:
>How much speedup in drawing time can I expect by using triangular 
>mesh approach? (system is 4D/310-VGX-FX 3.3.2 16Mb)

Quite a bit.  I haven't used the vgx, but on PI's and GTX's tmeshes
give dramatically better performance (since after the first triangle
you're only passing one new vertex per triangle through the pipeline).

>I am computing the vertex normals myself. Can the graphics hardware
>do this for me?

Nope.  (Or does the VGX do something new?  And if so - or if it could -
would it be faster than a fast software algorithm?)

Marc

-- 
Marc Andreessen___________University of Illinois Materials Research Laboratory
Internet: andreessen@uimrl7.mrl.uiuc.edu____________Bitnet: andreessen@uiucmrl