[GRASS-dev] [GRASS-user] NViz - problem in the visualization of 3D objects

[Helena Mitasova]

I have seen this problem - it is similar to issues with rendering the box point symbols and at some scales
even for spheres.
Carla, have you tried to move around the light - does it change anything?

Helena
 
Helena Mitasova
Associate Professor
Department of Marine, Earth, and Atmospheric Sciences
2800 Faucette Drive, Rm. 1125 Jordan Hall
North Carolina State University
Raleigh, NC 27695-8208
hmitaso at ncsu.edu

"All electronic mail messages in connection with State business which are sent to or received by this account are subject to the NC Public Records Law and may be disclosed to third parties.” 

On Feb 14, 2013, at 1:15 PM, Anna Kratochvílová wrote:

> On Thu, Feb 14, 2013 at 6:30 PM, Carla Rebelo <crrebelo at gmail.com> wrote:
>> Hi,
>> 
>> I have footprint buildings and the height value (type double
>> precision) of each footprint.
>> 
>> v.info -t map=buildings@
>> nodes=250
>> points=0
>> lines=0
>> boundaries=243
>> centroids=88
>> areas=89
>> islands=8
>> faces=0
>> kernels=0
>> primitives=331
>> map3d=1
>> 
>> After the v.extrude step "v.extrude --overwrite --verbose
>> input=buldings@ output=buildings3D hcolumn=Height type=area
>> 
>> v.info -t map=buildings3D@
>> nodes=646
>> points=0
>> lines=0
>> boundaries=0
>> centroids=0
>> areas=0
>> islands=0
>> faces=743
>> kernels=88
>> primitives=831
>> map3d=1
>> 
>> When I visualized the file 3D from NViz, I have seen some of the
>> buildings with a black filling (it's black inside or the top of
>> building is black) ....
>> 
>> Is it a problem of rendering? Or a problem with the topology?
> 
> Some of the buildings look ok? I've just tried a small example and it
> works for me .
> 
> There could be a problem with the normal vectors of the faces.
> Unfortunately I don't know much about the topology of kernels.
> 
> Regards,
> Anna
> 
>> 
>> Best regards,
>> CR
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