[GRASS5] NVIZ - more bugs

[Hamish]

> > NVIZ in GRASS 6beta2 (built from source) still contains the 
> > strange coloring bug regarding 3d-site-vectors: 
> > When such vectors are displayed atop raster data, everything is 
> > fine at first sight. However, any manipulation requiring a redraw 
> > renders the image pitch-black. Setting the lighting to max shows 
> > that the color used for the sites is somehow "draped" over the 
> > landscape + the weird darkening effect. 
> >  
> > This bug prevents any serious use of 3d-sites, except for "gothic 
> > GIS" if there is such a thing. 
> >  
> > Peter 
> > 
> Peter, I tried it yesterday with the 3D site file that is in the demo
> data set slovakia - it worked fine - both when draped and when
> displayed as 3D. Can you try it with the slovakia data set
> (remeber to load it as vector points from nviz interface, not vector
> from command line) and see whether it works? If yes, we need to look
> at your data to see what is different,
> 
> Helena


maybe this sheds some light on the matter:

in semi-related issues, NVIZ Image Dump to Max Res PPM is giving me a
dark image again. I thought that Glynn had fixed this some time ago, but
it is back again..

see:
 http://grass.itc.it/pipermail/grass5/2004-August/015202.html


GS_lights_on() in lib/ogsf/GS2.c


http://grass.itc.it/pipermail/grass-commit/2004-August/012451.html


This never got applied to the 5.7 CVS, but I've done it now, please test.




Hamish