Faces to components problem

oalexis · 20 Sept 2009, 03:38

Hi I was wondering if there was an upper limit to Chris fullmer's Faces to components plugin? I'm trying to use it on a model with under 2000 tris and it keeps crashing SU. I'll attach the model so maybe someone can play around with it and see why its not working

UAVcrysis.skp

Chris Fullmer · 20 Sept 2009, 04:51

More than likely its a problem with my scripting.

I'll take a look at it and see what I find,

Chris

oalexis · 20 Sept 2009, 06:20

Thanks for the swift response I hope you can figure it out. Its pretty hard to UV map in SU without your plugin

TIG · 21 Sept 2009, 10:26

Running any script that makes multiple components or groups etc will fall over if the Outliner window is open and not 'rolled up' = known bug with Outliner... Check the tool with no Outliner open ?

oalexis · 21 Sept 2009, 13:40

thats not it TIG, I never use outliner so its never open

Chris Fullmer · 21 Sept 2009, 15:13

I also don't have the outliner open, and it still crashes.

If you wanted to look quickly at ths code TIG I'd be quite happy. I'm pretty sure I've narroed the problem down to the loop that adds each face to a group and then turns the group into a component.

I really have not kept up with all the group and component snippets that have been written recently. So perhaps you have a snippet that would work better than:

faces.each do |e|
group = entities.add_group( e )
group.to_component
end

Because that is scrashing on this model. And interestingly, it doesn't crash on the first face. IT normally processes 10 to 20 faces, then crashes. So far I have not figured out what the problem is

Chris

TIG · 21 Sept 2009, 18:59

I don't have a copy of the full code, BUT...


faces.each do |e|
  group = entities.add_group( e )
  group.to_component 
end

Might be the problem ! It destroys the entities face/edges etc as you go ?
So some things disappear before you can process them !
Try something like this... assuming 'entities=model.active_entities' etc are predefined...


groups2process=[]
edges2go=[]
### first we 'clone' the faces...
faces.each{|face|
  points=[]; face.vertices.each{|v|points<<v.position}
  group=entities.add_group()
  face2=group.entities.add_face(points)
  face2.reverse! if face2.normal != face.normal
  face2.material=face.material
  face2.back_material=face.back_material
  ### also clone attributes etc - you add this...
  ### also clone materials/attributes of edges etc - you do this...
  groups2process<<group
  ### stuff to go...
  edges2go<<face.edges
  face.erase! ### it's now in the group
}
edges2go.uniq!
edges2go.each{|e|e.erase! if e.valid? and e.faces.length==0}
groups2process.each{|group|group.to_component}
### this should process tidily... ;)

oalexis · 21 Sept 2009, 23:33

anyway to put that back into the plugin? I have no idea how to use ruby...

TIG · 22 Sept 2009, 08:28

Made a few tweaks to the untested code and added undo and counter etc...

This quick ruby file makes 'selected faces into components' - put the file into your plugins folder, open the model, select the faces and type 'selectedfaces2components' in the ruby console...selectedfaces2components.rb

Chris Fullmer · 28 Sept 2009, 05:53

ok, I've also tried to update my code and I think it is improved. I'm not sure if its perfect. But perhaps its better? It seems to work on the UAV model now. But if TIG's is working well, you might just stick with it. I think he re-creates your geometry, whereas I am moving the original into the components (which is not recommended, but it seems to work here). Any, hope it helps.

Chris

v 1.2

TIG · 28 Sept 2009, 09:34

@chris fullmer said:

ok, I've also tried to update my code and I think it is improved. I'm not sure if its perfect. But perhaps its better? It seems to work on the UAV model now. But if TIG's is working well, you might just stick with it. I think he re-creates your geometry, whereas I am moving the original into the components (which is not recommended, but it seems to work here). Any, hope it helps.
Chris

You can move entities wholesale into a group:
model.active_entities.add_group(required_entities)
BUT they must include 'all_connected' geometry that's 'sensitive' to the 'move' into the group - otherwise you run the risk of perhaps moving a face into a group and not its edges, if it takes its edges they might have other connected faces, then these they are screwed by loosing an edge etc etc...

So the safest way is to do something like this: where you group the required_stuff AND its all_connected, copy that group, explode one and then throw away everything that's in the remaining group that's not needed - e.g. keep required_stuff AND any faces' edges etc they are not in the set already...

honoluludesktop · 24 Oct 2009, 04:33

TIG, I hacked your code to add a right click menu choice. I have a little programing expierence, but don't know Ruby. Do you mind if I mess with it in this way?

If thats OK with you, can you show me how to end up with one big component, or group made up of individual faces rather then all the seperate components?

This is the modified code

honoluludesktop · 24 Oct 2009, 20:01

TIG, Thanks, Even at my rate (slow), I'll eventually learn some Ruby, and the SU API:-)

TIG · 24 Oct 2009, 21:00

@honoluludesktop said:

TIG, I hacked your code to add a right click menu choice. I have a little programing expierence, but don't know Ruby. Do you mind if I mess with it in this way?
If that's OK with you, can you show me how to end up with one big component, or group made up of individual faces rather then all the separate components?

Hack as much as you want, but please ensure that any of your versions that 'get out' have explanatory text in them so as to apportion blame and not confuse the user

If you look at the code... We loop through each of the faces - first we add an empty group to the model.active_entities and then clone the face with it's properties into that group, then we erase the original face - remembering to leave any shared edges. Finally that group in made into the component.

To change it so that each of the face-group-components is added into a super-group change the lines to read


### outside of the loop we make a new 'supergroup'
supergroup=model.active_entities.add_group()
supergroup_entities=supergroup.entities
### later in the loop for each face we change the group's 'destination'...
group=supergroup_entities.add_group()
### rather than the previous 'model.active_entities'
### etc

Now all of the face-groups [which are now actually separate components] are inside a 'super_group'.
At the end you can name that or change it into a component itself, thus...


supergroup_component=supergroup.to_component
supergroup_component.definition.name="Face_SuperGroup#1"
supergroup_component.name=supergroup_component.definition.name

oalexis · 13 Nov 2009, 04:47

thanks for your help on this guys, the right click option that you made honolulu doesn't seem to work on my computer but Chris, your updated code works so thank you very much