[REQ] drop and drape

solo · 14 Jan 2011, 21:43

Just wondering if it's possible to make a ruby that can drop and drape a plane, Like a cloth simulation.

I can almost get what I need using small blocks and smart drop as these illustrations show.

Here I made a plane using 50x50 individually grouped blocks (RED) with a base surface (BLUE) and a drape shape (Yellow).

Using Smartdrop I dropped the blocks to achieve this drape shape.

Okay, what I'd like it to be able to do this without the blocks but rather a plane, which I'd probably use the 'from scratch tool' in sandbox to create, I would need the mesh to stay attached and form over the shape/s they drop on.

Am I making sense?

solo · 14 Jan 2011, 21:46

Here is a drop with multiple different surfaces.

Rich O Brien · 14 Jan 2011, 21:58

Drape CPoints - http://forums.sketchucation.com/viewtopic.php?t=21379

Point Cloud Triangulation - http://rhin.crai.archi.fr/RubyLibraryDepot/plugin_details.php?id=292

TIG · 14 Jan 2011, 22:27

@unknownuser said:

Drape CPoints - http://forums.sketchucation.com/viewtopic.php?t=21379
Point Cloud Triangulation - http://rhin.crai.archi.fr/RubyLibraryDepot/plugin_details.php?id=292

Thanks - beat me to it...
This tool makes cpoints on the surface then you make the mesh from those...

solo · 14 Jan 2011, 22:48

I have that script with the delauney and triangulate in my plugins folder, however I cannot to the life of me find the triangulate option anywhere in SU, it's supposed to be in the plugins drop down but nada, I installed it 5 times incase I messed up somehow, but still nothing appears in SU 8.

Rich O Brien · 14 Jan 2011, 22:49

Nice to see someone appreciates me around here

TIG · 14 Jan 2011, 23:06

@solo said:

I have that script with the delauney and triangulate in my plugins folder, however I cannot to the life of me find the triangulate option anywhere in SU, it's supposed to be in the plugins drop down but nada, I installed it 5 times in case I messed up somehow, but still nothing appears in SU 8.

Plugins >> Triangulate points...
What version did you install ?

solo · 14 Jan 2011, 23:11

I have both triangulate.rb and points_cloud_triangulation.rb.

TIG · 14 Jan 2011, 23:41

@solo said:

I have both triangulate.rb and points_cloud_triangulation.rb.

And delauney2.rb ?
What happens if you type triangulate_points into the Ruby Console ?
I have these files in ../Plugins AND I get the Plugins menu item 'Triangulate points'
You haven't suffered some weird Vista type compatibility files folder problems ??

solo · 15 Jan 2011, 02:07

I typed it in, it asked me if I wanted to put it on a new layer, I clicked yes and it did nothing.

Ruby consol showed a 0.

Yes I have delauney2.rb in plugins folder.

solo · 15 Jan 2011, 02:15

Then I closed SU, opened it again, made new setup, exploded points and got this:

triangulate_points
Error; #<ArgumentError; C;/Program Files (x86)/Google/Google SketchUp 8/Plugins/points_cloud_triangulation.rb;107;in `triangulate'; wrong number of arguments (1 for 0)>
C;/Program Files (x86)/Google/Google SketchUp 8/Plugins/points_cloud_triangulation.rb;107
C;/Program Files (x86)/Google/Google SketchUp 8/Plugins/points_cloud_triangulation.rb;107;in `triangulate_points'
(eval);948

No thing happened however, still points and no mesh.

If I choose not to put on layer I get this:

triangulate_points
Error; #<ArgumentError; C;/Program Files (x86)/Google/Google SketchUp 8/Plugins/points_cloud_triangulation.rb;107;in `triangulate'; wrong number of arguments (1 for 0)>
C;/Program Files (x86)/Google/Google SketchUp 8/Plugins/points_cloud_triangulation.rb;107
C;/Program Files (x86)/Google/Google SketchUp 8/Plugins/points_cloud_triangulation.rb;107;in `triangulate_points'
(eval);107

xrok1 · 15 Jan 2011, 04:53

try this???
http://forums.sketchucation.com/viewtopic.php?f=323&t=24676

TIG · 15 Jan 2011, 15:23

Solo

Please remove your points_cloud_triangulation.rb and install my version from here http://forums.sketchucation.com/viewtopic.php?p=301274#p301274 - extract the two .rb files into Plugins... note it needs my version 'delauney3.rb' included in the zip.

I suspect from your error message that the 'unencapsulated' method 'trangulate' in delauney2 is getting compromised by another method of the same name loading from another script... My versions contains the methods inside a 'class'.

solo · 15 Jan 2011, 16:09

Thanks TIG, it works now.

Jim · 31 Jul 2011, 03:43

Could not this be done more directly using an actual PolygonMesh instead of using cpoints? I mean, you could generate a flat mesh of some density, then iterate the points and adjust each points's Z coordinate (using .set_point) to the "ground" using raycast?

TIG · 31 Jul 2011, 10:49

@jim said:

Could not this be done more directly using an actual PolygonMesh instead of using cpoints? I mean, you could generate a flat mesh of some density, then iterate the points and adjust each points's Z coordinate (using .set_point) to the "ground" using raycast?
You certainly could - the drape_cpoints then triangulate method was written some while ago in response to a request [it does allow you to adjust some of the cpoints before making the mesh so in some respects it's perhaps easier that trying to move a mesh's vertices later on?]... BUT a method like you suggested that auto-drapes a flat [grouped] mesh over some 3d solid forms below using a raytest and a 'vertex-move' method would be quite doable [so over to you...]