[Plugin] QHull
-
thanks for the developer，very nice
-
YES!!!! I have been really.....really....REALLY needing this lately! I can't wait to try this as soon as I am done writing this reply. I'll let you know how it goes.
@unknownuser said:
Can someone enlighten me, please? What it the purpose of having such a random geometry?
Tomasz,
I wouldn't call it "random geometry" as the "randomness" would depend on the point cloud used as the basis for the Voronoi diagram but rather call it "mathematically generated geometry". 3D Voronoi structures (2D Voronoi diagrams aside) are used in cellular-level research, bone fatigue studies, and experimental cellular architecture.
-
Well, there are a few snags but I am still VERY pleased with this large chunk of progress. Kudus, avariant! This is a major step forward in the Qhull/Voronoi plugin development.
Has ANYBODY been able to get the "selection" versions of Voronoi, convex, Delaunay, or half working at all? I have been unable to do so under any circumstance regardless of point cloud size or attitude in SU6. I use SU6 at work and SU7 at home so I haven't tried it in SU7 yet. I generated lsystem point clouds of various sizes and was totally unable to get them to work. Then I tried various hand-made point clouds, ones generated from sandbox meshes, and even point clouds generated from 2D Voronoi diagrams and all did not work (see error message pic).
On the positive side, all of the operations based on points generated by rbox work just fine and it is really nice to have them working within SU! I guess for now, to generate 3D Voronoi geometry from my own points, I'll have to follow my own procedure as outlined in this post
I feel like we're almost there and it will only take a slight nudge to get this totally working.....I am still quite excited about this.
-
@unknownuser said:
Has ANYBODY been able to get the "selection" versions of Voronoi, convex, Delaunay, or half working at all?
In fact yes
You must make a group before launch the Qhull plug
Half works also but result is like 111 pixel at the origin so you must rescale the result
For your points I don't know yet but I suppose if you make a group maybe that works too
-
OOOhhhhh.... oversight on my part!
When examining the standard SU 'model', there usually aren't construction points. Everything is edges and faces. So, I just search for all the edges and use the starting vertex for each edge (to avoid duplicate points, I don't use the end). It never occurred to me to also search for construction points, but I can see how that would be useful!
To see how the selection part works now, create a random convex shape. Then select the component, and do voronoi on selection. There you will see how it works. In the meantime, I'll update it to capture construction points also.
As far as purpose.... well... it's artistic, right?
Actually, convex hull can have a legitimate purpose. If you have a complex model, do a convex hull selection on it, you'll get a sort of 'shrink wrap' shell of the entire model. I'm sure the others have legitimate purposes too. -
Add the actual plugin! (D'oh)
EDIT: Updated to work for SU6
EDIT 5/14/2009: Updated to work with ConstructionPoints
-
Fixed for using Construction Points.
-
A tutorial or two to demonstrate how to use this plugin would be nice.
Regards,
Bob -
YES...YES.....YES!!!!! Everyhing is working now! Thank you especially for the update for use with construction points. I tried every variant I could think of, lsystem point clouds, sandbox mesh grids, convex geometry groups....it all worked.....flawlessly! It took awhile but as I told other members in other related posts.....somebody in this terrific community forum will come in and save the day!
Thank you avariant!!!
-
My pleasure. It was fun, and I've always been a fan of the 3D Voronoi shapes.
-
MALAISE
-
I haven't been able to generate any shapes with selected shapes, or with selected construction points, if in a group/components/outside a group/component. I get the following errors:
"qhull generated empty results"
"qhull failed to generate valid results"ideas?
-
If your points are all on the same plane, then you won't get any results.
To ensure it works at all:
1.Create new, empty scene.
2. Plugins->Qhull->Convex->Medium
3. A convex shape should be created. Select it.
4. Plugins->Qhull->Voronoi->Selection(Free)
5. A spiky shape should be created.If all that works, then the problems is your input data (ie model / points).
-
I honestly don't know the math, but A LOT of regular shapes, like cubes, planes, etc, don't generate valid voronoi results. They may still generate results from the other options, and will often work if you choose Selection (Sphere) or Selection (Box). I don't know why... math, right?
-
So is that normal?
Always take a convex volume for any function
-
No problem ! Thats fun
(click image for erase scroll bar)
-
Avariant - Thank's for your Qhull.rb - it could be a crucial piece of the puzzle I'm trying to solve, except I can't get it to function with my own (grouped) convex form.
@avariant said:
If your points are all on the same plane, then you won't get any results.
To ensure it works at all:
1.Create new, empty scene.
2. Plugins->Qhull->Convex->Medium
3. A convex shape should be created. Select it.
4. Plugins->Qhull->Voronoi->Selection(Free)
5. A spiky shape should be created.If all that works, then the problems is your input data (ie model / points).
Also, if I follow your test instructions, Steps # 1-3 work, but using 4. Plugins->Qhull->Voronoi->Selection(Free) {or any of the other selection options for step 4) yields no results. Using one of the non-selection size options (small through huge) as Step 4 yields the anticipated spiky shape.
I'm having the same trouble as Halroach (did you ever find the solution why?)
@unknownuser said:
Re: [Plugin] QHull
Postby Halroach on Tue May 19, 2009 8:07 am
I haven't been able to generate any shapes with selected shapes, or with selected construction points, if in a group/components/outside a group/component. I get the following errors:
"qhull generated empty results"
"qhull failed to generate valid results"Please help me find a path to generate voronoi shapes from convex polygons generated and selected by me (not by Convex).
Thanks!
-
@22curious said:
I'm having the same trouble as Halroach (did you ever find the solution why?)
I haven't found a solution yet...
-
Can you post a small example scene?
Very "regular" results, like a cube, a sphere, all geometry in a single plane, usually won't generate valid results. It's just how the mathematics work.
-
Hello!!
Thank you for the plugin!
It s AMAZING!
But I have the same problem as Halroach.....
... I select the group, (the convex medium), then I run voronoi Selection (Free), and suddenly, sketch up window is minimized, and appears the two error messages ...:
Qhull failed to generate valid results,
Qhull generated empty results
....Thank yoouuu!!
Advertisement