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Bugs item #1886654, was opened at 2008-02-04 23:28
Message generated for change (Comment added) made by elias
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Category: Core Library
Group: 4.2.0rc2
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: KSX (karl-seele)
Assigned to: Nobody/Anonymous (nobody)
Summary: source for rendering problem.
Initial Comment:
The rendererer of _soft_polygon3d_f (polygon3d_f) (gouroud + zbuffer) is not rendering the interpolation of the colors correct.
See the attached pictures in rar-file. One original captured and the other one digitally converted, to see the rendering problem.
There is a +1/-1 or <,<=,>,>= condition problem in the algorithym.
Karl
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>Comment By: Elias Pschernig (elias)
Date: 2008-02-07 17:00
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Ah, thanks, I wasn't aware one of the examples already shows the problem.
Still, I can't see this here running the code you posted. Is there a way to
make it more visible, or can you tell how you made that second picture?
(Oh, and there's no need to post executables or DLLs, we all do have
Allegro after all, and most of us also don't have access to Windows.)
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Comment By: KSX (karl-seele)
Date: 2008-02-05 07:19
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something got wrong. I try it again.
File Added: renderproblem-example.rar
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Comment By: KSX (karl-seele)
Date: 2008-02-05 07:17
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Binary exe of the examples (256 kb upload limit isnt good).
File Added: renderproblem-bin.rar
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Comment By: KSX (karl-seele)
Date: 2008-02-05 07:14
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See the attached files, that produces the rendering problem. This is just
a quick modification from the examples, using the Z-Buffer draw. I have
used the last stable version 4.2.2 of allegro. This rendering problem can
be overlooked by most of the people. I have tried to fix to problem, but
have not found where the problem actually lies. It is definitely not a
rounding problem caused by the fixed-type. It is a problem of the
algorithmus/code.
Karl
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Comment By: Elias Pschernig (elias)
Date: 2008-02-04 23:44
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Thanks! Can you also provide a short example program which will draw the
faulty polygon? In case someone wants to try and fix it, that sure would be
helpful.
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