[Bf-python] Point clouds

[Kris Nackaerts]

In my case, I have a point cloud extracted from aerial imaging based on an unmanned platform. I'm actually first of all interested in visualisation of the point cloud so I can show it to third parties.

A static visualisation of such cloud does not tell the whole story (30%). A 3D animation does show up the full potential of such data.

Next step is tesselation/information extraction.

I do have color information per point, but do not use this yet. With dupliverts, I don't think one could use it, since you just copy one object to all points. On the other hand, 50k points runs very smoothly in this way.

Kris

-------- Original-Nachricht --------
> Datum: Thu, 25 Mar 2010 11:03:46 -0400
> Von: Ian Johnson <enjalot at gmail.com>
> An: Blender Foundation Python list <bf-python at blender.org>
> Betreff: Re: [Bf-python] Point clouds

> Do the cubes have to be identical? What if one wanted to make different
> cubes different colors? Are you moving the vertices around to create an
> animation?
> 
> If i have 20k points which I want to move over time and have their colors
> change, would particles be the way to go?
> 
> This is a very interesting discussion, thanks!
> Ian
> 
> On Thu, Mar 25, 2010 at 10:55 AM, Kris Nackaerts <knackaerts at gmx.net>
> wrote:
> 
> > Thank's,
> >
> > Dupliverts solved the issue!
> >
> > I import point cloud data as vertices. Next define a cube and assign it
> to
> > the mesh.
> >
> > many thank's
> >
> > Kris
> >
> > -------- Original-Nachricht --------
> > > Datum: Wed, 24 Mar 2010 23:29:42 +0200
> > > Von: Toni Alatalo <antont at kyperjokki.fi>
> > > An: Blender Foundation Python list <bf-python at blender.org>
> > > Betreff: Re: [Bf-python] Point clouds
> >
> > > Kris Nackaerts kirjoitti:
> > > > I'm trying to read point cloud data (X Y Z R G B). As vertices it
> works
> > > great, but whar can I do with vertices with respect to visualisation?
> > I've
> > > no experience with particles yet, coud this help and define vertices
> as
> > > particles?
> > > >
> > >
> > > Particles might be an option - another is dupliverts, which is about
> > > having an object (e.g. a pyramid mesh) show in the location of each
> > > vertex of a mesh:
> > >
> >
> http://wiki.blender.org/index.php/Doc:Manual/Modeling/Objects/Duplication/DupliVerts
> > > . Dupliverts is much more efficient for the scene handling (is just
> one
> > > object) and for drawing too (at least it could be, and i hope it is
> > > somewhat in reality of the current code now too .. dunno if it has
> been
> > > optimized to VBOs or anything like that yet).
> > >
> > > > One file contains 5000 locations and runs fine, when starting file
> 2,
> > > the system begins to slow down dramatically. In total I have 50000
> > points,
> > > reading them as vertices is really quick, no problem.
> > > >
> > >
> > > 50k objects in a scene is a lot for Blender currently, it is not
> really
> > > optimized for that (could perhaps be improved, dunno if have been
> looked
> > > at recently).
> > >
> > > ~Toni
> > >
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> 
> 
> 
> -- 
> Ian Johnson

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