On 18/02/2025 13:25, Maetes wrote:
> I'm currently trying my hand at spherical heightfields, but I'm running into
> strange problems.
> I put a height map (DEM) of the moon around a sphere, based on these forum
> posts:
>
https://news.povray.org/povray.binaries.images/thread/%3C38a2dc5b%40news.povray.org%3E
>
https://news.povray.org/povray.text.scene-files/thread/%3C38A037EB.504C1A6%40inapg.inra.fr%3E/?ttop=444549&toff=750
> 
> Everything looks good in the global view, but when I zoom in closer, radial
> errors appear at the day-night boundary.
> A higher resolution of the DEM does not change anything, and it works fine when
> using bump_map.
> But the larger the sphere (contained_by), the finer the disturbances?!
> 
> Unfortunately, I have no idea what the functions in the script do.
> This one in particular puzzles me:
> x*x+y*y+z*z + 0.1 - hftext(x,y,z).y * 0.03
> 
> Can someone help me with that?
> Is there a reasonable tutorial that explains the working of user-defined
> functions well?
> Or does anyone find the bug in the script that causes the glitches?
> 

The moon... very good subject. Have you looked at LUNEX ?
Lots of examples and code :

<https://www.phpsciencelabs.com/lunex-for-pov-ray/>




-- 
kurtz le pirate
compagnie de la banquise

Post a reply to this message