Angus Dorbie (dorbie++at++sgi.com)
Tue, 23 Jun 1998 13:24:33 -0700
www.dorbie.com
The "Billboard" section looks at this topic, and it's ripe
for the addition of the higher level of detail you mention.
Cheers,Angus.
Jimmy Moore wrote:
>
> Hello all,
> We are trying to determine the optimal way to have a large number of
> individual trees in our database. I understand that there are tradeoffs
> between having Cross trees (two polys in the shape of an X) vs. having
> billboards. Both affect the cull pretty much the same. Cross trees hit your
> draw harder because you are essentially drawing 8 triangles vs. 2 for
> billboards. Billboarded trees look better and don't hit your draw as hard, but
> you have to spend time in the app rotating them toward your eyepoint.
> What I am interested in knowing is:
> 1. Has anybody documented performance differences between Billboards
> vs. Cross trees?
> 2. Has anybody tried using a billboard as the highest level of detail
> for a cross tree and would this be a feasible solution?
>
> --
> Jimmy Moore "Virtually Recreating the World"
> Engineer
> Quality Research, Inc.
>
> moore++at++rdbewss.redstone.army.mil
> phone: (256) 876-9096
> fax: (256) 842-0969
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