[GRASS5] [bug #2991] (grass) NVIZ fails to display 3D polygons

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this bug's URL: http://intevation.de/rt/webrt?serial_num=2991
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Subject: NVIZ fails to display 3D polygons

Platform: GNU/Linux/i386
grass obtained from: Mirror of Trento site
grass binary for platform: Compiled from Sources
GRASS Version: grass-6.0.cvs_src_snapshot_2005_01_22

NVIZ doesn't display 3D polygon properly. Visualisation with 3D polygons is impossible.

Details:

nviz elevation=dem vector=drzewa_3d

After the second press of DRAW button in NVIZ my DEM becomes almost 
completely black. Any raster overlay is invisible.

Radim's sample dataset does it too (house_roof,house_wall polygons).

The 5.7 snapshot from 2003_10_04 does not have this problem!

More info by Jachym Cepicky, Peter Löwe and me:
http://grass.itc.it/pipermail/nvizlist/2004-April/000038.html
http://grass.itc.it/pipermail/grass5/2005-February/017312.html
http://grass.itc.it/pipermail/grass5/2005-February/017379.html

Maciek

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