Thanks guys,
Ciaran, your addon actually works exceptionally well in my case. The
slider for the "Override_test_distance" gets rid of the errant areas
very very well. Not to mention generating this particle cloud is super
fast now. You've saved me some late night work today. :)
I did try to roll my own but was still getting the unwanted areas. The
tips on how to build it are appreciated as it may help in future cases.
Cheers,
Eric Thivierge
===============
Character TD / RnD
Hybride Technologies
On 07/05/2013 7:23 PM, Ciaran Moloney wrote:
IIRC implementing the ray intersect technique is problematic in ICE,
since the raycast node only returns the first intersection. You'd have
to manually shoot subsequent rays after every hit.
On Wed, May 8, 2013 at 12:06 AM, Raffaele Fragapane
<raffsxsil...@googlemail.com <mailto:raffsxsil...@googlemail.com>> wrote:
You could write/wire the test yourself.
Point inside hull is fairly trivial outside of fringe cases, shoot
a ray in any direction, if it intersects an odd number of times,
it's outside, even, it's inside.
You might want multiple rays and take the median of the result, or
work conservatively and flag it even if just one tests true.
You can further refine this with a force field approach, run a
distance from hull (closest location on geo), and if the point is
close enough to a location with a normal facing away from its
distance vector remove it, and remove anything within a certain
threshold (very close) indiscriminately.
Testing against denser geometry also helps, even if it's more
expensive, sparse and variedly populated topology tends to
introduce more room for error.
Lastly, a triangulated mesh, especially if you have a certain
degree of dis-planarity in your geo on large enough areas, will
also improve things in my experience.
On Wed, May 8, 2013 at 4:54 AM, Eric Thivierge
<ethivie...@hybride.com <mailto:ethivie...@hybride.com>> wrote:
Anyone notice how many times this just doesn't work correctly?
Even toggling the Closed volume inside often doesn't give the
correct results as well...
I have a voxel setup with particles and testing inside a
geometry to keep the ones that are within, works, however
there are many points still outside the geo that remain and
aren't deleted. The ones left outside changes each frame as well.
Anyone have any sure fire methods / workarounds that don't
involve having helper nulls to delete the remaining ones outside?
--
Eric Thivierge
===============
Character TD / RnD
Hybride Technologies
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