Hi grass community,
sorry to have to ask - i’ve read through some of the help topics but either i’m not finding the correct answers or not executing the commands correctly.
i want to display a raster in 3D. i.e. display landscape maps ‘draped on top’ of the dem so i can show the terrain in 3D rather than as a flat image.
do i need to convert a raster to a 3D raster via r.to.rast3 or r.to.rast3elev, set the region for 3D?
how to display?
any help is appreciated!
Janet
Janet Choate said:
i want to display a raster in 3D. i.e. display landscape maps 'draped on
top' of the dem so i can show the terrain in 3D rather than as a flat
image.
do i need to convert a raster to a 3D raster via r.to.rast3 or
r.to.rast3elev, set the region for 3D?
how to display?
Not at all. As far as I know, r.to.rast3 is for real 3D with volume and all.
What you want is sometimes called 2.5D and is simply achieved by:
nviz elevation=dem color=landscale_map
The nviz screen should pop open and then you should be able to move your 3D
display as desired.
Regards,
Marcello.
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As to my experience it is also important to set up the region, resolution and
3D-resolution before you launch nviz, as Marcello suggested:
Assuming that your dem has 30-meter resolution:
g.region rast=dem res=30 res3=30
then do:
nviz elevation=dem color=landscale_map
Hope you can do it this way.
Stefan
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