[Bf-committers] Particle experiments - looking for feedback

Alexander Ewering bf-committers@blender.org
Sat, 1 May 2004 13:30:12 +0200 (CEST)

On Sat, 1 May 2004, Leon Turner wrote:

> Alexander - you're right about non-planar quads (although it works
> fine with planar quads) - particles do leak in this case. I'm in two
> minds on this: on the one hand it would be nice to allow non-planar
> quads, and it wouldn't be too difficult to code.

I'm not sure if it only happened for non-planar quads. I remember one
of your comments in tuhopuu's featurelist.txt where you assumed that
"lost collisions" happened due to excessively high particle or object
However, a lot more leakage happens due to quads, and I *think* 
I tried it with a simple subdivided plane, in which all faces are
definitely planar. And there too, there was a huge amount of particle
leakage, and converting all quads to triangles with ctrl-t completely 
fixed it.

Maybe I remember wrong or you have fixed it in the meantime. Anyway,
I would indeed propose that you treat all quads as two triangles (you
can use the fact that the two "correct" triangles in a quad always have 
the same order (123, 134 I think), or at least provide a button "perfect
collisions". :)

Otherwise, your extensions really are great. And people here know I don't
say that easily :-)

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