Christoph Hormann wrote:
> news://news.povray.org/3E89FD53.12F835E6%40gmx.de
> http://news.povray.org/povray.binaries.images/31083/220908/#220908
> 
> :-)
> 
I know you did some similar things although I did not have the image 
in memory very well. Gonna look at them again... 

> I'm not sure how you render the 1/60 degree topography with 1/30 degree
> color with only 600Mb memory - according to my calculations this would
> take more.
> 
Let's see: 
Topo is 1/60 degree, hence 21600 x 10800 pixels, i.e. 222 mega-pixels. 
Thus, I need 444 Mb of height data (it's 2 byte). 
Adding 1/30 degree RGB color, 10800 x 5400 x 3 = 167 Mb
Together, that's 611 Mb. 
POVRay actually uses 620 Mb VM (according to the kernel). 

I wonder where I could habe failed to calculate that correctly ;)

> I'd strongly reduce the height exaggeration (with 2 km grid 5x-10x should
> give quite pleasant results)
> 
Hmm... Maybe I'll give it a try. 
My Mars images use height exaggeration of 10. But Mars has more 
extreme topography. 

http://www.cip.physik.uni-muenchen.de/~wwieser/render/img/mars/
(Take the 2048x1536 JPEG to see the craters.)

Wolfgang

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