POV-Ray : Newsgroups : povray.advanced-users : how to do ultra-hi-res image_mapping on a sphere? : Re: how to do ultra-hi-res image_mapping on a sphere? Server Time
28 Jul 2024 20:22:53 EDT (-0400)
  Re: how to do ultra-hi-res image_mapping on a sphere?  
From: Christoph Hormann
Date: 20 Dec 2003 13:02:03
Message: <iveeb1-srt.ln1@triton.imagico.de>
Erhard Ducke wrote:
> Hi!
> Can anyone give me a hint how to image_map very high resolution pictures on
> a sphere?
> 
> The (earth) sphere is basically rendered with a ~8kx4k pixel projected on
> it but there are special regions of interest that should use parts of a
> 40kx20k file.
> So NOT the whole giant bitmap is used but only a fragment that should be
> patched over the lo-res bitmap.

You can either use a spherical warp or code the spherical mapping 
yourself with a function pigment.

Christoph

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