[AD] [ alleg-Bugs-1886654 ] source for rendering problem.

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Bugs item #1886654, was opened at 2008-02-04 23:28
Message generated for change (Comment added) made by karl-seele
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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: 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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