POV-Ray : Newsgroups : povray.binaries.images : POV-Earth thread : Re: POV-Earth thread Server Time: 9 Aug 2020 15:00:26 GMT
  Re: POV-Earth thread  
From: Bald Eagle
Date: 7 Jul 2020 00:20:01
"Bald Eagle" <cre### [at] netscapenet> wrote:
> So, I'm trying to take the face subdivisions from a QuadSphere and uv-unwrap
> them so I can overlay it on an image map.
>
> I tried generating cartesian corner vertices, converting to spherical
> coordinates, and then just plotting those theta and phi angles on the x and y
> with  faux-sphere-sweeps for the horizontal and vertical coordinates, and got
> some odd results.

reworked the code a bit, and that didn't help any.  Then I switched over to f_th
and f_ph instead of whatever I was using to convert from Cartesian to
latitude/longitude.

That fixed things nicely - almost.

A have some straight horizontal lines now that create "extra" latitudinal
lines/circles.   So I'll have to puzzle out the origin of those.


Post a reply to this message


Attachments:
Download 'cubesphere_uvgridmaker.png' (186 KB)

Preview of image 'cubesphere_uvgridmaker.png'
cubesphere_uvgridmaker.png


 

Copyright 2003-2008 Persistence of Vision Raytracer Pty. Ltd.