Christoph Fuenfzig wrote:
What does the Cylinder Sphere intersection test do in OpenSG, did you
look into it? Is it conceptually wrong, or does it have bugs?
I looked at it, but I can't really figure out exactly what it does (not
being a computational geometry wizard, only a mere apprentice). The
comments look ok though.
From what I gather, it's checking if endpoints are within sphere (if
true, return collision), if not then it decomposes into two vectors
(parallell/perpendicular to cyl-axis) and checking the lengths of these
vectors. I can't really figoure out how the decomposition is done, so I
am unable to verify that one.
For the cylinder sphere part there is an article from JGT about Point
Cylinder Distance (with code)
see http://www.acm.org/jgt/papers/BarbierGalin04/
I noticed that one, but missed that it had source code (doh). Thanks!
I'll see how it performs.
I also don't think OBBs are an option, as they are difficult to update
under (large) deformations.
I do not have any deformations, merely rigid-body transforms, so in my
case it would be an option. Also, I am only interested in the volume for
a single geometry, not a composite with internal mutable transforms.
Regards,
/Marcus
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