[GRASS-user] Light shading of 3D polygons in NViz changes every time the DRAW button is used

[niktzel]

I'm trying to make a small 3D scene with some buildings on a DEM, using Grass
and NViz via QGIS.
Every time I use the DRAW button the shades from the lighting are changing
and they are always different!..
Also the lighting seems strange, it seems like there's a different light
source placed in a different place for every building!..
Some idea of what happens from anyone? Or is it a bug?
Images are attached coming from 3 successive uses of the DRAW button.
The platform is Windows 7 with QGIS 1.8. 
<http://osgeo-org.1560.n6.nabble.com/file/n5043484/draw.jpg> 



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