pfLayer polygons and the clipping plane

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Todd R Pravata (tpravata++at++rts.dseg.ti.com)
Fri, 12 May 95 12:14:08 CDT

My loader uses pfLayer for the network (roads, rivers, etc.) polygons
in the scene. The underlying terrain forms the base and the roads are
decaled on top. Note the database is "tiled". The terrain and
network polygons for each 1K tile are placed in a single pfLayer node
for that tile. The network polygons are clipped to the tile boundary.

I've noticed that the decaled polygons at the far clipping plane make
the cull before the base layer. So when there is a hill in the
distance coming into view with a road on it, first the roads stick up
with no terrain underneath, then the terrain comes in. Is this a
problem with bounding spheres? Do I need to force the bounding
spheres of the base and decal layer geometry to be the same? Or is
there something else going on here?

--
Todd R. Pravata           INTERNET: todd.pravata++at++dseg.ti.com
Texas Instruments, Inc.   VAX MAIL: MCOPN3::PRAVATA            
P.O.Box 869305, MS 8518   TI MSGID: TPRA
Plano, Texas, 75086       VOICE: (214)575-6126  FAX: (214)575-6771


-- My views are my own and are not necessarily those of Texas Instruments. --

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