trees-0.5.pl output fails to display in NVIZ (was: Re: [GRASS5] NVIZ - strange phenomena)

[Maciek Sieczka]

Jachym,

After having learned about your trees-0.5.pl I grabbed it too, and, wow, it 
is wow!!! But - I'm having the same problem Peter Löwe reported.

The commands I used:

trees-0.5.pl in=drzewa out=drzewa_3d elevation=dem vvar=1.0 crown=1.0 
pvar=1.0

nviz elevation=dem vector=drzewa_3d_trunks,drzewa_3d

After the second press of DRAW button in NVIZ my DEM becomes almost 
completely black and the raster overlay is not visible. However - when layer 
"drzewa_3d_trunks" is displayed ALONE all is fine. The problem occures only 
when displaying the crowns too - "drzewa_3d" in my case.

Do you guess what could be the reason? Should I provide more information? Is 
anybody having the same problem?

My system:
grass-6.0.cvs_src_snapshot_2005_01_22
built from source on Mandrake 10.1 with tcltk 8.4

Maciek

----- Original Message ----- 
From: ""Peter Löwe"" <peter.loewe at gmx.de>
To: <grass5 at grass.itc.it>
Sent: Tuesday, February 08, 2005 10:23 AM
Subject: [GRASS5] NVIZ - strange phenomena


> Hi,
>
> trying to grow forests on elevation models by Jachyms fine script
> http://www.fle.czu.cz/~jachym/programs/trees-0.5.pl I came across several
> strange effects in the current version of NVIZ (built from source on
> Debian).
> When 3d-vectors (jachym-trees) are included, the lighting/coloring of the
> raster-surfaces turns pitch-black after changes of the point of view.
>
> However, cranking up all lighting parameters to max and raising the
> light-source to 1000 helps get a greyish impression of the surface.
>
> That's where the magic begins: A change of the trees color (say, from 
> green
> to RED (on the greyish surface)) is displayed as expected (red tree on 
> grey
> ground). HOWEVER, the next change of color (say, RED to BLUE) results in a
> blue tree standing on a RED surface.
>
> Puzzled,
> Peter
>
> -- 
> Dr. Peter Löwe
>
> Diplom-Geograph
>
> <loewe at geomancers.net>
> <peter.loewe at gmx.de>