POV-Ray : Newsgroups : povray.bugreports : alpha.10064268 freezes : Re: alpha.10064268 freezes Server Time
17 Sep 2021 21:52:18 EDT (-0400)
  Re: alpha.10064268 freezes  
From: jr
Date: 3 Dec 2019 08:40:00
Message: <web.5de6653248df159ffeeb22ff0@news.povray.org>

William F Pokorny <ano### [at] anonymousorg> wrote:
> On 12/3/19 4:53 AM, jr wrote:
> > "jr" <cre### [at] gmailcom> wrote:
> ...
> > some more information (fwiw).  same error in alpha.9945627.  without the 'once'
> > keyword the scene renders (but not useful since the decal repeats).
> I've not much hobby time at the moment and what I have is going toward
> other stuff. As always, having a small-ish complete scene which shows
> the problem would be a help to whomever debugs.

using the scene from the collection zip verbatim, except for adding an
equivalent pigment, does illustrate the issue.

> - What happens if you leave 'once' but scale up enough to be sure the
> robot is covered by the image_map-once? Don't worry about how it would
> look.

no difference in the 3.8 versions.  3.7.1-alpha.8656843 - v interesting.  using
the pigment as shown, I get the single decal but the other texture has turned
transparent and the droid looks like a weird mix of glass and (white) emissive
media.  :-)

> - What happens with v3.7? The image_map alpha channel / transparency
> handling was re-worked in v3.8 IIRC.
> - Have a vague recollection of another image_map alpha channel /
> transparency related issue in v3.8 too for which I don't think there was
> a resolution. I don't remember details at the moment. If so, we should
> find that thread and add a link here to it and visa versa.

the image is 8-bit rgb, no alpha, in case it matters.

regards, jr.

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