POV-Ray: Newsgroups: povray.binaries.images: Adding an alpha gradient to an image_map?: Re: Adding an alpha gradient to an image

POV-Ray : Newsgroups : povray.binaries.images : Adding an alpha gradient to an image_map? : Re: Adding an alpha gradient to an image_map?		Server Time 30 Jul 2024 08:16:55 EDT (-0400)

From: Jörg 'Yadgar' Bleimann
Date: 13 May 2012 11:23:23
Message: <4fafd1eb$1@news.povray.org>

Hi(gh)!

On 13.05.2012 17:10, Stephen wrote:

> I tried this a few years ago. IIRC my solution was to have the day lit
> map just above the night map. And difference the day lit sphere with a
> box, another sphere would do as well. The terminator was very straight.
> But with clever unions you will be able to keep the night side away from
> the sun and it can be animated.

I've seen this method elsewhere 
(http://www.kuffner.org/james/gallery/raytracing/earth_from_space/), but 
what if I want to use spherical meshes for the Earth surface later on? 
Also using the mesh two times with a very small radial offset?

See you in Khyberspace!

Yadgar

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