[GRASS-user] r.out.pov scale question

[Markus Neteler]

Adam,

find attached my (old) r.out.povscript script which does the needed
calculations. Perhaps
giving some ideas. the Povray scales are a bit tricky.

cheers
Markus

On Wed, Oct 27, 2010 at 6:07 PM, Adam Dershowitz, Ph.D., P.E.
<adershowitz at exponent.com> wrote:
> I have been trying to use r.out.pov but something is not clear to me from the documentation, and examples I can find on the web.
> If I use hftype=0 (the default) then, as I understand it it, each step, from 0-65535 represents one map unit (meters in my case).  That is giving me too much "stair-stepping" in POVRAY.
> I think that part of the issue is that there is too much rounding of elevations.  So, I decided to try hrtype=1.  As I understand it that will scale the height of the image to use more of the range (my map just goes from 61-1086 meters).  But, I can't seem to figure out how much it scales by.  There is also the scale= option in r.out.pov, but I am not sure if that is a multiplier or a divider?
> This is important because I need to then scale the heighfield in my POV file.  If I use hrtype=0 then this is correct:
> scale < dx, 65535, dy >
>
> But, if I use hftype=1, what is the correct value for the above scale command?  Is it 65535/1086 (max height in the map?)
> 65535/(1086-61)  (vertical range of my map?)
>
> If I use scale=10 then should it be?
> scale < dx, 65535/10, dy >
> scale < dx, 65535*10, dy >
> scale < dx, 10, dy >
>
> Or should I use scale=0.1?  Or should I use r.out.pov scale=65535/1086
>
> Thanks,
>
> --Adam
>
>
>
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