ARGHH, as usual, no proof reading is as good as the one done after sending. Even = outside Odd = inside.
On Wed, May 8, 2013 at 9:06 AM, Raffaele Fragapane < [email protected]> 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 <[email protected]>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 >> >> >> > > > -- > Our users will know fear and cower before our software! Ship it! Ship it > and let them flee like the dogs they are! > -- Our users will know fear and cower before our software! Ship it! Ship it and let them flee like the dogs they are!
