Billboards vs. Cross Trees
Jimmy Moore (moore++at++rdbewss.redstone.army.mil)
Tue, 23 Jun 1998 14:58:28 -0500
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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