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William F Pokorny <ano### [at] anonymous org> wrote:
>
> Aside 2: In a surprise to me, the use_alpha option uses the red channel
> when it cannot find an actual alpha channel for the return values.
>
Confirmed in Windows v3.8.0 beta 1-- using a typical .png COLOR image_map for
the image_pattern (non-indexed and with no alpha-channel). BTW, I already had an
image_pattern test scene available from 2018, courtesy of a Thomas De Groot
post... but I never noticed this red-channel-only behavior.
It seems to me that it should use the image's gray values instead (like a .gray
equivalent). That would make more sense... and would be consistent with, for
example, a bump_map (which uses the gray values for its normals by default).
The other inconsistency is the height_field-- which again uses only the red
channel from a color image_map. That should use gray as well, IMHO.
I wonder why these features are restricted to the red channel? Perhaps, when
they were first introduced, the idea was that only gray-scale image_maps would
be used in them(?)
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