[GRASS5] nviz problems

Jaro Hofierka hofierka at geomodel.sk
Fri Nov 5 06:10:36 EST 2004

This would be the best solution. It also needs some notice that vertical 
reference is needed for 3D modules and nviz.


Radim Blazek wrote:

> Why WIND and WIND3?!
> Cannot we add top, bottom, depths and t-b resol to WIND? Default (if not 
> defined)  will be:
> top: 1
> bottom: 0
> depths: 1
> t-b resol: 1
> We can add these variables to struct Cell_head and call G_*_window from 
> G3d_*Window.
> Radim
> Helena wrote:
>> Hamish
>> I already discussed this issue with Markus but I did not follow up
>> on the list (as I am trying not to create too many distractions from 
>> 5.4 release).
>> Yes, nviz ALWAYS needs WIND3, even if you work just with 2D data.
>> It is needed to initialize the interface. It will be rather messy to have
>> it start differently for 2D and 3D data.
>> This is my suggestion (as there are and will be more modules that will 
>> require
>> 3D region)
>> >Modify grass57 startup to check and ask for 3D region info.
>> > What I have in mind is that when you start grass57, it will check for
>> >WIND3 and if it is not there it will say e.g.:
>> >This GRASS release is a 3D GIS and requires 3D region definition, do you
>> >want to have it automatically created (you can later modify it using 
>> g3.region) ? y/n
>> > then the default WIND3 will just take the current region information
>> >and define WIND3 with 1 vertical layer.
>> >If it is done like this we don't have to worry about which module 
>> requires
>> >it and we don't need to implement this question into each such module
>> Markus, would you have time to implement this modified start-up?
>> After Paul is done with the release, I suggest that we also revisit 
>> the vertical
>> datum issue and creation of a new location under 5.7 as a 3D location 
>> with 3D window and
>> a coordinate system definition that includes both horizontal and 
>> vertical datums.
>> Helena
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