Kent Watsen (watsen++at++netcom.com)
Tue, 5 Jul 1994 07:39:37 -0700 (PDT)
I have a terrain database which implements some roads
as subfaces to the underlying terrain polygons. I
also have some buildings which when viewed such that
the subfaced roads are on the far side of the building,
the roads are still seen. This effect is proportional
to the distance from the building the camera is located.
Hence, if I am far away, the road is easily seen to be
rendered in front of the building polygons, and as I move
closer, the roads slowly recede and rendered correctly.
This behavior suggests that subfaces in 1.2 are implemented
by simply hashing the road polygons one z-buffer-bin higher
then the underlying polygon, and thus rendered in front.
However, at the same time, the buildings are also hashed
into the same z-buffer and false rendering occur. My database
is modelled in Multigen and is structured such that a tile
of terrain is under a group bead. Under which, in a preorder
traversal of object beads, are land (terrain w/ subfaced roads),
trees, buildings). The DB is loaded by LoadFlt, so pfFlatten
and pfClean are called by default. This DB rendered fine in
GVS.
Has anyone else experienced anything like this?
Kent Watsen
Watsen++at++netcom.com
DCS Corporation
Simulation Branch
703.683.8430 x369
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