Spreading points randomly within a brep

Replies to This Discussion

Permalink Reply by David Rutten on April 20, 2012 at 5:30pm

Hi Chris,

you can distribute points randomly within a Box volume using the [Populate 3D] component in the Vector.Grid panel. The populate component inserts points randomly, but also makes sure the distribution is fairly smooth. It is therefore a special kind of random. It is also possible to randomly create points within a box volume using the Random and PointXYZ components if you're unhappy with the 'smart' points created by Populate3D.

Now, on to your brep. It's possible and fairly easy to remove points that are outside a brep. So you could first create a 3d point population that encompasses the entire brep, then remove all those points outside of it. This however will not allow you to control exactly how many points will end up on the inside.

It will be quite tricky to create a well-balanced distribution of N points on the interior of a closed Brep. Please let me know if you're looking for an exact count or not.

--

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by chris.kalch on April 21, 2012 at 4:28am

Hey, thanks for the quick answer! I added the files to my post! As you can see, I want to use the cell-borders of the voronoi diagramm as inner-structure. Therefore the loft/shell needs to intersect with it!

By changing the number of points within the loft, I could controll the number of cells/spaces inside the shape and the density of the columns. Is there a possibility to use Inside from surface.analysis?

ck

Attachments:

• chameleon.3dm, 283 KB
• chameleon.gh, 25 KB

Permalink Reply by David Rutten on April 21, 2012 at 6:35am

I'm not entirely sure what you're after, but I attached two files that fill a space with 3D voronoi cells. Hope it helps (and hope you can open them without problems).

They are both pretty slow, my 3D voronoi algorithm doesn't use volumetric delaunay optimization...

--

David Rutten

david@mcneel.com

Poprad, Slovakia

Attachments:

• voronoicut.gh, 4 KB
• voronoicull.gh, 4 KB

Permalink Reply by chris.kalch on May 3, 2012 at 7:02am

Thanks again! I'm managed to get the cells.

But when I transform it into a mesh I couldn't get rid of the net wrapped around the cells. I tried with mesh split but it didn't work. I added the files, so you can understand what I mean.

ck

Attachments:

• project_voronoi.3dm, 191 KB
• project_voronoi.gh, 14 KB