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Trace this
- Revision 2
- by Tobias Schlitt
- Fri, 9 Jan 2009
- 12:34:32 +0100
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More 3D fun with PHP
Kore is again fiddling around with his PEAR package Image_3D... While implementing something new, he rendered the following "Zebra-Pig", which actually resulted from a bug. Anyway, the whole package is cool, and the pig looks quite funny! ;) Go on, Hardkore!
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Hallvar Helleseth
That is a really nice pig! Makes me wonder what "algorithm" an animal uses to get its stripes and patches ;-) Looks totally genuine...
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Chris D
Maybe this post should be entitled "Bug in PHP Code Creates Abomination!"
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Toby
I think "Mutation" is a bit better here. It's not really abominate, or? Anyway, would have been cool to have that for April 1st! ;)
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kore
Perhaps I destroy the magic of the picture, but let's explain:
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The calculation of the light influencing each polygon uses the normale vector of the polygones.
The normale vector depends on the order of the points defining the polygon (non-clockwise).
The algorithm for subdivision surfaces declares some of the polygones with points in clockwise order, so that the normale vector points to the inner side of the pig, which caused - after some modifications in the enlightenment code - black polygones. ... it was really a bug, but a very nice one. I love this picture ;)
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