POV-Ray: Newsgroups: povray.beta-test: Output Alpha problem when exporting from blender: Re: Output Alpha problem when exporting from blender

POV-Ray : Newsgroups : povray.beta-test : Output Alpha problem when exporting from blender : Re: Output Alpha problem when exporting from blender		Server Time 3 Jul 2024 16:37:34 EDT (-0400)

From: Warp
Date: 23 Mar 2010 12:05:49
Message: <4ba8e6dd@news.povray.org>

IIRC, POV-Ray 3.5 mishandled alpha transparency against the background
in that with antialiased edges and semi-transparent surfaces it blended
the surface's color with the background color and then saved the resulting
color with an alpha value. This caused object borders to have a pixel-wide
halo of the wrong shade, and especially semi-transparent surfaces would have
the wrong color.

  This was fixed in POV-Ray 3.6, where it's calculated correctly (iow. the
background color has no effect on the pixel colors when using +UA).

  Last time I checked (it has been some time, though), the same problem had
resurfaced in POV-Ray 3.7 beta. Someone had undone the fix in POV-Ray 3.6.

  Has this been corrected already?

-- 
                                                          - Warp

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