SUBSCRIBE The SideFX mailing list is a great place to make contact with Houdini users. To subscribe, send us an email with no subject and the word subscribe in the body.
[Sidefx-houdini-list] Create attribute (primuv, primnum) similar to scatter sop does?
Wednesday, 12 February 2014 Wed, 12 Feb '14
In my experience, yes - considerably faster and more exact. Lattices always involves averaging between multiple points, but barycentric lookups are just that - lookups - no interpolation beyond the specific polygon the point is stuck to. Last I was on a bird feathering project where we switched the rig from a point lattice to barycentric uv lookups - the feathers stopped floating off the skin and the whole thing was at least 10 times faster. i pretty much use that type of setup wherever i can. m On Wed, Feb 12, 2014 at 3:54 PM, Dominik Kirouac <dk at shedmtl.com> wrote:
Thanks Mike, xyzdist is exactly what I was searching, it should be more precise than a lattice using point method? *Dominik Kirouac // SHED ** *FX Artist 1410, RUE STANLEY, 11E ?tage MONTR?AL (QU?BEC) H3A 1P8 T 514 849-1555 F 514 849-5025 WWW.SHEDMTL.COM <http://www.shedmtl.com/> Le 12/02/2014 3:15 PM, Michael Dunkley a ?crit : Hey Dominik, the easiest way I know of is the "xyzdist" VOP / Vex > function. > It'll find the closest position on a geometry to your point and give > back > the barycentric coordinates. "intersect", the VOPS version of ray, should > also work, so long as you know the vector you're projecting along. > > Best, > Mike > > > On Wed, Feb 12, 2014 at 3:03 PM, Dominik Kirouac <dk at shedmtl.com> wrote: > > Hey all, >> >> Here is the problem, we have curves (hairguides) import from another >> software(xsi) with alembic. We create a group of points with the root of >> each hair and we are trying to make this group stick to the deforming >> geometry. >> >> I want to replicated one of the behavior of the scatter sop(create primuv >> attribute on points and primnum). >> >> Is there a way we can get these informations from the closest geometry >> using a ray sop or expressions ? >> >> Thanks >> >> >> *Dominik Kirouac // SHED ** >> *FX Artist >> 1410, RUE STANLEY, 11E ?tage MONTR?AL (QU?BEC) H3A 1P8 >> T 514 849-1555 F 514 849-5025 WWW.SHEDMTL.COM <http://www.shedmtl.com/> >> >> _______________________________________________ >> Sidefx-houdini-list mailing list >> Sidefx-houdini-list at sidefx.com >> https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list >> >> _______________________________________________ > Sidefx-houdini-list mailing list > Sidefx-houdini-list at sidefx.com > https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list > _______________________________________________ Sidefx-houdini-list mailing list Sidefx-houdini-list at sidefx.com https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list