POV-Ray : Newsgroups : povray.general : Help: The normal map is not working : Re: Help: The normal map is not working Server Time
28 Mar 2026 12:57:04 EDT (-0400)
  Re: Help: The normal map is not working  
From: Bald Eagle
Date: 26 Mar 2026 14:10:00
Message: <web.69c5762cb63eec03c110185125979125@news.povray.org>
"Kenneth" <kdw### [at] gmailcom> wrote:

> You're right, it *is* kind of odd. I took a look at Lanahum's code again, and
> there is nothing there to cause that little circle.

I think I see why - the image_map is getting wrapped around that point as a
pole.
That's why you get that purple/white circle - it's the right edge of your image
map.

> A purple circle shows up on the sphere where the bump_map's 'circle'
> was-- along with a white dot in the center, which is probably a 1-pixel 'repeat'
> from the left side of the image_map(?). So the anomaly does not seem to be
> bump_map specific.
>
> Perhaps it's a result (or a glitch?) of using map_type 0 when applying an
> image_map of any kind to a *sphere*.

Could be.
No way to know without comparing it to spherical map_type.
In the meantime, put a (different) colored stripe along the left side of that
image_map and see if the color of the central dot changes.

If it's a persistent "repeat", then that's a problem.
I should already have a fix for that, if such is the case, but that will require
another dive into the depths of the source code.

y'all know how I love that.

- BE


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