Best way to get all Face's in model?

draftomatic

I'm having trouble getting an Array of all Face's in the model, since Sketchup.active_model.entities returns Group objects, without the Face's contained within them.

thomthom


model = Sketchup.active_model
faces = []
faces.concat( model.entities.select{|e| e.is_a?( Sketchup;;Face ) }
model.definitions.each { |d|
  next if d.image?
  faces.concat( d.entities.select{|e| e.is_a?( Sketchup;;Face ) }
}

draftomatic

Thanks thomthom!

exvion

thomthom, I run your code on Sketchup 7.1:

(eval);508; compile error
(eval);505; syntax error, unexpected tIDENTIFIER, expecting ')'
model.definitions.each { |d|
     ^
(eval);508; syntax error, unexpected '}', expecting ')'<<< Process finished.

TIG

Ther was a typo [a missing ')'...]

    model = Sketchup.active_model
    faces = []
    faces.concat( model.entities.select{|e| e.is_a?( Sketchup;;Face ) }
    model.definitions.each { |d|
      next if d.image?
      faces.concat( d.entities.select{|e| e.is_a?( Sketchup;;Face ) } )
    }

exvion

This code work:

 model = Sketchup.active_model
    faces = []
    faces.concat( model.entities.select{|e| e.is_a?( Sketchup;;Face ) }    )
    model.definitions.each { |d|
      next if d.image?
      faces.concat( d.entities.select{|e| e.is_a?( Sketchup;;Face ) } )
    }

draftomatic

@exvion said:

This code work:

 model = Sketchup.active_model
>     faces = []
>     faces.concat( model.entities.select{|e| e.is_a?( Sketchup;;Face ) }    )
>     model.definitions.each { |d|
>       next if d.image?
>       faces.concat( d.entities.select{|e| e.is_a?( Sketchup;;Face ) } )
>     }

It doesn't seem to be working for me. I put it as a method called get_face_array() inside a class called Tester:

This is a 68.2MB model.

thomthom

faces = [] faces.concat( model.entities.select{|e| e.is_a?( Sketchup::Face ) } )

Could be simplified to:

faces = model.entities.select{|e| e.is_a?( Sketchup::Face ) }

thomthom

@draftomatic said:

It doesn't seem to be working for me. I put it as a method called get_face_array() inside a class called Tester:

It doesn't return the correct number because the code doesn't take into account instances.

<span class="syntaxdefault">def number_of_faces<br />  model </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> Sketchup</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">active_model<br />  faces </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> model</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">entities</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">select</span><span class="syntaxkeyword">{|</span><span class="syntaxdefault">e</span><span class="syntaxkeyword">|</span><span class="syntaxdefault"> e</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">is_a</span><span class="syntaxkeyword">?(</span><span class="syntaxdefault"> Sketchup</span><span class="syntaxkeyword">;;</span><span class="syntaxdefault">Face </span><span class="syntaxkeyword">)</span><span class="syntaxdefault"> </span><span class="syntaxkeyword">}.</span><span class="syntaxdefault">length<br />  model</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">definitions</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">each </span><span class="syntaxkeyword">{</span><span class="syntaxdefault"> </span><span class="syntaxkeyword">|</span><span class="syntaxdefault">d</span><span class="syntaxkeyword">|<br /></span><span class="syntaxdefault">    next if d</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">image</span><span class="syntaxkeyword">?<br /></span><span class="syntaxdefault">    next if d</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">count_instances </span><span class="syntaxkeyword">==</span><span class="syntaxdefault"> 0<br />    faces </span><span class="syntaxkeyword">+=</span><span class="syntaxdefault"> </span><span class="syntaxkeyword">(</span><span class="syntaxdefault"> d</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">entities</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">select</span><span class="syntaxkeyword">{|</span><span class="syntaxdefault">e</span><span class="syntaxkeyword">|</span><span class="syntaxdefault"> e</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">is_a</span><span class="syntaxkeyword">?(</span><span class="syntaxdefault"> Sketchup</span><span class="syntaxkeyword">;;</span><span class="syntaxdefault">Face </span><span class="syntaxkeyword">)</span><span class="syntaxdefault"> </span><span class="syntaxkeyword">}.</span><span class="syntaxdefault">length </span><span class="syntaxkeyword">*</span><span class="syntaxdefault"> d</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">count_instances </span><span class="syntaxkeyword">)<br /></span><span class="syntaxdefault">  </span><span class="syntaxkeyword">}<br /></span><span class="syntaxdefault">end</span>

thomthom

Or - even easier if you can settle with SU7.1 or higher:

model.number_faces

thomthom

Oh, wait - you actually need arrays of all the face entities?

draftomatic

@thomthom said:

Oh, wait - you actually need arrays of all the face entities?

Well, I really just needed to iterate through all the Faces in the model... the array thing is just useful for testing.

Bah, I should've realized the instances issue... So your code in the 2nd post isn't quite right

thomthom

@draftomatic said:

Bah, I should've realized the instances issue... So your code in the 2nd post isn't quite right

It depends what you do with it...
If you need to count the faces you need to take into account all instances.

But if you need to just iterate over all faces you only need to process model.entities and the entities of each definition, even if a definition has multiple instances, a face in that definition is the same in each instance. It just exist in multiple locations.

draftomatic

@thomthom said:

@draftomatic said:

Bah, I should've realized the instances issue... So your code in the 2nd post isn't quite right

It depends what you do with it...
If you need to count the faces you need to take into account all instances.

But if you need to just iterate over all faces you only need to process model.entities and the entities of each definition, even if a definition has multiple instances, a face in that definition is the same in each instance. It just exist in multiple locations.

As you saw a few minutes ago, I'm writing an exporter, and it doesn't keep Component information. I need every Face.

draftomatic

Closer, but still not working:

Here's the get_face_count() method I'm using:

  def get_face_count()
    count = 0
    @model.entities.each { |e|
      if (e.is_a?(Sketchup;;Face))
        count +=1
      end
    }
    
    @model.definitions.each { |d|
      next if d.image?
      next if d.count_instances == 0
      count += d.entities.select { |e|
        e.is_a?(Sketchup;;Face)
      }.length * d.count_instances
    }
    return count
  end

thomthom

hm... instances inside other instance might throw the count of...

I think you need to traverse the model in a tree like structure

<span class="syntaxdefault"><br />def&nbsp;process_model<br />&nbsp;&nbsp;walk_faces</span><span class="syntaxkeyword">(&nbsp;</span><span class="syntaxdefault">Sketchup</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">active_model&nbsp;</span><span class="syntaxkeyword">)<br /></span><span class="syntaxdefault">end<br /><br />def&nbsp;walk_faces</span><span class="syntaxkeyword">(&nbsp;</span><span class="syntaxdefault">entities</span><span class="syntaxkeyword">,&nbsp;</span><span class="syntaxdefault">transformation&nbsp;</span><span class="syntaxkeyword">=&nbsp;</span><span class="syntaxdefault">Geom</span><span class="syntaxkeyword">;;</span><span class="syntaxdefault">Transformation</span><span class="syntaxkeyword">.new&nbsp;)<br />&nbsp;&nbsp;</span><span class="syntaxdefault">faces&nbsp;</span><span class="syntaxkeyword">=&nbsp;[]<br />&nbsp;&nbsp;for&nbsp;</span><span class="syntaxdefault">e&nbsp;in&nbsp;entities<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span class="syntaxkeyword">if&nbsp;</span><span class="syntaxdefault">e</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">is_a</span><span class="syntaxkeyword">?(&nbsp;</span><span class="syntaxdefault">Sketchup</span><span class="syntaxkeyword">;;</span><span class="syntaxdefault">Face&nbsp;</span><span class="syntaxkeyword">)<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span class="syntaxdefault">faces&nbsp;</span><span class="syntaxkeyword"><<&nbsp;</span><span class="syntaxdefault">e<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span class="syntaxkeyword">elseif&nbsp;</span><span class="syntaxdefault">e</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">is_a</span><span class="syntaxkeyword">?(&nbsp;</span><span class="syntaxdefault">Sketchup</span><span class="syntaxkeyword">;;</span><span class="syntaxdefault">Group&nbsp;</span><span class="syntaxkeyword">)<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span class="syntaxdefault">faces</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">concat</span><span class="syntaxkeyword">(&nbsp;</span><span class="syntaxdefault">walk_faces</span><span class="syntaxkeyword">(&nbsp;</span><span class="syntaxdefault">e</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">entities</span><span class="syntaxkeyword">,&nbsp;</span><span class="syntaxdefault">transformation&nbsp;</span><span class="syntaxkeyword">*&nbsp;</span><span class="syntaxdefault">e</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">transformation&nbsp;</span><span class="syntaxkeyword">)&nbsp;)<br />&nbsp;&nbsp;&nbsp;&nbsp;elseif&nbsp;</span><span class="syntaxdefault">e</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">is_a</span><span class="syntaxkeyword">?(&nbsp;</span><span class="syntaxdefault">Sketchup</span><span class="syntaxkeyword">;;</span><span class="syntaxdefault">ComponentInstance&nbsp;</span><span class="syntaxkeyword">)<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span class="syntaxdefault">faces</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">concat</span><span class="syntaxkeyword">(&nbsp;</span><span class="syntaxdefault">walk_faces</span><span class="syntaxkeyword">(&nbsp;</span><span class="syntaxdefault">e</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">definition</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">entities</span><span class="syntaxkeyword">,&nbsp;</span><span class="syntaxdefault">transformation&nbsp;</span><span class="syntaxkeyword">*&nbsp;</span><span class="syntaxdefault">e</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">transformation&nbsp;</span><span class="syntaxkeyword">)&nbsp;)<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span class="syntaxdefault">end<br />&nbsp;&nbsp;end<br />&nbsp;&nbsp;faces<br />end<br /></span>

(Untested - but something like this)

draftomatic

Your code had a few lil typos; this one works:

  def process_model()
    return walk_faces( Sketchup.active_model.entities )
  end

  def walk_faces( entities, transformation = Geom;;Transformation.new )
    faces = []
    entities.each { |e|
      if e.is_a?( Sketchup;;Face )
        faces << e
      elsif e.is_a?( Sketchup;;Group )
        faces.concat( walk_faces( e.entities, transformation * e.transformation ) )
      elsif e.is_a?( Sketchup;;ComponentInstance )
        faces.concat( walk_faces( e.definition.entities, transformation * e.transformation ) )
      end
    }
    return faces
  end

Thanks Tom, you're the best!

thomthom

There we go - got there in the end!

draftomatic

One more question - I see you're messing with a transformation - if I ask a nested instance for, say, it's Face's vertices locations (assuming it's just a rectangle or something simple), will it give me the (globally) correct coordinates, or something relative to the Component's origin?

I guess ComponentDefinitions have entities, so I can ask for their locations. But ComponentInstances are transformed somewhere... I don't have much experience with transformations...

EDIT: Ah nevermind, I see now that you're carrying the transformation through each nesting of an instance. Gotcha.

Thanks again Tom

thomthom

Had a feeling the transformation would be needed.