Michael T. Jones (mtj++at++babar.asd.sgi.com)
Tue, 13 Aug 1996 06:20:15 -0700
:Any reason why the PFDECAL_BASE_STENCIL isn't costly on iR, are you just
:referring to the stencil overhead and not the multipass on the base
:polygons?
InfiniteReality supports a 1-bit stencil with only a 5% reduction in
fill rate, which is considerably better than RealityEngine's 50% drop
for stencil-enabled fill. These rates apply to both base and layer
geometry.
As always, stenciling implies somewhat less efficiency in mode
sorting, since the order of base and layer can not be changed
by the cull process. (i.e., you can't draw all the runways and
then all the stripes as you might expect to happen when the
displace style of coplanarity is in use).
Michael
Be seeing you, Phone:415.933.1455 Fax:415.965.2658 M/S:8U-590
Michael T. Jones Silicon Graphics, Advanced Systems Division
mtj++at++sgi.com 2011 N. Shoreline Blvd., Mtn. View, CA 94039-7311
"Du musst Amboss oder Hammer sein" -- Goethe
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