[Sidefx-houdini-list] Point cloud interpolation in SOPs?
probbins at sympatico.ca
Wed May 9 08:47:16 EDT 2007
Okay, so I sent a hip file but it's being held at the border.
In the add sop , "skip every Nth point", then convert the resulting
curve to nurbs, resample that, then use another add to keep the points
That way you just add points on the "surface".
I concerted to nurbs so the curve conforms to the surface better. Mind
you my example is just a sphere, so...
On Wed, 2007-05-09 at 13:22 +0100, Peter Bowmar wrote:
> Hi Peter,
> Har, that's exactly the first thing I tried! The problem was
> creating a coherency of associated points so that the Add SOP doesn't
> try to connect points that are too far apart from each other. Picture
> a ball of points falling into a rectangle of points. The ball and
> rectangle shouldn't be connected until they hit. Meta-ballish but I
> don't want to just copy Metaballs on there (doing that already, and it
> isn't working that well).
> Peter B
> On 09/05/07, Peter Robbinson <probbins at sympatico.ca> wrote:
> > Since I like avoiding scripting, what about running the cloud through an
> > add sop, generating a curve by primitive group, then refining the
> > resulting curve?
> > PeterR
> > On Wed, 2007-05-09 at 12:25 +0100, Peter Bowmar wrote:
> > > Hi,
> > > So, I've got this cloud of points, that are roughly in the shape
> > > of some objects. They're moving around. I want to add more points,
> > > interpolated (linear is fine) between the existing points. I don't
> > > want to have new points "outside" the existing objects, in other words
> > > the interpolation should happen within a distance threshold of other
> > > points, effectively adding more density to the point cloud without
> > > altering its "shape". I have thought of a few ways of doing this using
> > > pciterate() etc in VEX to create "normals" that give me the direction
> > > of max density etc. However, before I dive in, am I missing anything
> > > obvious?
> > >
> > > Cheers,
> > >
> > > peter B
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"gravity is not a force, it is a boundary layer"
"everything is coincident"
"Love: the state of suspended anticipation"
"To get any appreciable distance from the Earth in
a sensible amount of time, you must lie."
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