POV-Ray : Newsgroups : povray.general : texture_map interpolation : Re: texture_map interpolation Server Time
4 Jul 2022 02:26:46 EDT (-0400)
  Re: texture_map interpolation  
From: Ive
Date: 19 Oct 2010 09:52:27
Message: <4cbda29b$1@news.povray.org>
On 19.10.2010 13:26, Christian Froeschlin wrote:
> The documentation for texture_map states:
>
> "The blended area of a texture map works by fully calculating both
> contributing textures in their entirety and then linearly interpolating
> the apparent colors."
>
> Now, as long as the textures are just plain colored pigment
> I would have expected that the result of a texture_map looks
> identical to a color_map with the corresponding colors.
>
> However, the "strands" in the below test scene get much
> thinner with the texture_map (regardless of whether the
> strands are bright on dark or vice versa, so it probably
> is not due to some strange gamma issue).
>
> Why is the output different? In linear color space, wouldn't
> the apparent color of the texture be linearly dependent on the
> color of the pigment? To keep it simple I removed the light
> source in the below code so everything is just ambient.
>


It is the same problem as mentioned here:

http://news.povray.org/povray.beta-test/thread/%3C48112367%241%40news.povray.org%3E/?ttop=351703&toff=350

...and I had myself meanwhile completely forgotten about it.

-Ive


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