Help!!! How to join 2 clouds of Points into one single cloud???

i'm using Populate 3D to generate Point Cloud.

But i need two different kinds of density.

So i used two "Pop3D". But how can I join them into one Cloud and use it for "Voronoi3D"?????

Thank you so much!!!!

Replies to This Discussion

Permalink Reply by Hannes Löschke on January 9, 2013 at 2:55pm

Did you try to connect both pointclouds to the same input? This is the normal GH way to join data from different sources.

Permalink Reply by Isabel on January 9, 2013 at 3:03pm

Thank you for your Reply!

i found out the "Set Union" . It really works!

Permalink Reply by Hannes Löschke on January 9, 2013 at 3:25pm

Please clarify your intention and the way your two point clouds are created. SetUnion combines both input lists and removes duplicates. You probably don't need that.

a) If both Pop3D have the same seed value but different counts, the list with the smaller count is juzst a subset of the longer list. All you need to connect to Voronoi is the larger list.

b) If both Pop3D have different seeds, both sets have a high probability to be completely disjoint. Using SetUnion will be overkill, because there probably are no duplicate points. SetUnion will return the same set as both lists simply combined by connecting both sources to the same target. If there are duplicate points, Voronoi will ignore them anyway.

(If you don't know how to connect two different sources to the same target, I highly reccommend you to read up on some tutorials on how the Grasshopper GUI works.)

Permalink Reply by Isabel on January 9, 2013 at 4:01pm

Thanks! I'm new here.

That's what i'm doing. To get a 3D Voronoi with 3 kinds of Point Cloud. the Density is changing.

"Set Union" really works.

But can you tell me some Better way to do this. Do you mean that "Set Union" will get a lot of duplicated Points and then slow down the computing?

Permalink Reply by Hannes Löschke on January 9, 2013 at 4:11pm

Sure, Set Union will work, but as I wrote earlier it is totally unneccessary. It will check for duplicates where there are none and even if there were, the would be no problem for the Voronoi component. This check will take up time and ressources.

I see I forgot to add the picture I made to show you how the connection would look like:

If you don't know how to add multiple wires to an input, please refer to the Grasshopper Primer Page 21. (and probably you should work through the rest. But keep in mind that version 0.6. is pretty outdated by now and some things will have changed.)

Permalink Reply by Isabel on January 9, 2013 at 4:21pm

Wow!!! I forget it. Really thanks! I need to learn more tricks!!

Permalink Reply by Isabel on January 9, 2013 at 4:06pm

I mean, the density of my 3D Voronoi is changing with different hight.

Like the Cells of organism. The Size and Density are not all ways the same.

Am I doing it in the right way?

Permalink Reply by Michael Pryor on January 9, 2013 at 4:24pm

he is saying you can plug multiple wires into an input. For example you can just plug all the outputs of pop3d into the voronoi with shift+left click on mouse. In this case I just use multiple breps in one brep component followed by using multiple sliders as the n input for pop 3d (same amount of sliders as breps.

Attachments:

multi slider.gh, 2 KB
multi slider.3dm, 86 KB

Permalink Reply by Isabel on January 9, 2013 at 5:39pm

Great help! That's what i want!

I found out that you're very good at GH. Would you help me one more Question?

1. Goal: to build a 3D Voronoi Skeleton within a skyscraper volume.

2. Try：

step 1） build the facade skeleton with the outlines intersected from Voronoi cells and the skin of skyscraper. then use a some borrowed GH-sets to loft those outlines.

step 2) use some other borrowed GH-sets to loft the whole 3D Voronoi Skeleton. Then bake them. and then use "mesh boolean" in Rhino, to get the inner 3D Skeleton for the Skyscraper.

step 3) combine them, it's not perfect, but not too bad.

This is the result.

Problem: When I try to make the Point cloud more denser, the "mesh boolean" allways failed out. Because those Skeleton-meshs are too komplicated to split.

So is it possible to get the 3D Voronoi Skeleton just in once? To combine the inner 3D Voronoi and the facade-intersection?

Permalink Reply by Isabel on January 9, 2013 at 5:46pm

file here

Attachments:

skyscraper_question.gh, 27 KB

Permalink Reply by Isabel on January 9, 2013 at 5:49pm

modell

Attachments:

skyscraper_question.3dm, 5 MB

Permalink Reply by wenyu on June 2, 2014 at 3:42pm

Hi, i revise your GH. I got some ramdom points in rhino. and i apply this points into the voronoi system. But i got a problem that the the surface of the 3D voronoi on the boundary is not closed.

In the gh, the component VOLUME is orange, it says "Brep is not closed, volume results are not to be trusted. "

I don't know what wrong with it.

Attachments: