Triangulate triangles ?

pilou

4 ? Like what ? Please an image! You speak of a quadrangle hidden on a triangle ?
No 3 triangles!
A simple triangle(s)( any number ) with this simple construction of 3 medians

renderiza

Adding the feature to slit multiple face by automatically finding the center point will be great addition! This should triangulate any type of face aka trig, quad, ect... Because your connecting a line from center to every other vertex. Maybe adding things like skip one vertex every time you add a line will be interesting to see.

Rich O Brian that would be great as well!

Rich O Brien

It is Artisan subdivide. Thank you Catmull Clark

pilou

So no! And why not the connections with middles ?

Medians are wanted!
But if you a have the plugin why not, that can be used for other thing

pilou

Yep cool, but not like the first post
And I should know it!

pilou

Alas I have deserted the Ruby language for a while!

If you can make a little plugin that will be wonderful

renderiza

Here is an example code for achieving what you want Pilou...


model = Sketchup.active_model
ents = model.active_entities
sel = model.selection
faces = ents.grep(Sketchup;;Face)

faces.each do |face|
  vertices = face.vertices
  bbox = face.bounds
  cpoint = bbox.center

  vertices.each do |vertex|
    p1 = cpoint
    p2 = vertex
    line = ents.add_line p1,p2 
   end
end

Note: Some very pretty geometry start appearing when you keep splitting!

renderiza

I will do that!

TIG

Beat me to it
You might want to change the
faces = ents.grep(Sketchup::Face)
to
faces = **sel**.grep(Sketchup::Face)
So then the user changes only selected faces ?
OR perhaps
faces = sel.grep(Sketchup::Face) faces = ents.grep(Sketchup::Face) **unless faces[0]**
so it works on a selection OR everything if there is no selection...

Also you want to make it undoable, so add
**model.start_operation('subtri')** faces.each... ...end **model.commit_operation**

renderiza

Hahaha!

TIG I would be very happy if you modify your existing plugin to add Pilou is feature request.

I am interested in making this for learning and I have some additional ideas I want to explore. I consider you my mentor TIG and there will never be competition between you and me I promise!

By the way thanks for the suggestion!

Here is updated code...

model = Sketchup.active_model
ents = model.active_entities
sel = model.selection
faces = sel.grep(Sketchup;;Face)

model.start_operation('csplit')
  faces.each do |face|
    vertices = face.vertices
    bbox = face.bounds
    cpoint = bbox.center

    vertices.each do |vertex|
      p1 = cpoint
      p2 = vertex
      line = ents.add_line p1,p2
    end
  end
  sel.clear
model.commit_operation

TIG

OK
I'll make a simple script and publish it shortly...

renderiza

Thank you TIG!

anar

Thanks Pilou !
You convinced TIG...
And Thanks TIG, I think it's a must have !

TIG

Try this http://sketchucation.com/forums/viewtopic.php?p=495430#p495430
TriangulateAllFaces...

cotty

I think the triangulation is not the same...

renderiza

Both of these are very useful so maybe add an option to choose between the two.

TIG

To do the former you need to first triangulate all faces, then find each triangle's center using the angles' bisectors' intersections...

renderiza

Not as easy as using the center of face.bounds.center is it.

If I find the best way to do it with code I'll let you know...Best of luck!

renderiza

I sure don't call the code below a success but its definitely interesting...


model = Sketchup.active_model
ents = model.active_entities
sel = model.selection
faces = sel.grep(Sketchup;;Face)

model.start_operation('csplit')
  faces.each do |face|
    vertices = face.vertices
    edges = face.edges
    bbox = face.bounds
    cpoint = bbox.center

   edges.each do |e|
      e1 = e.start.position
      e2 = e.end.position      

      x = (e2.x + e1.x) / 2
      y = (e2.y + e1.y) / 2 
      z = (e2.z + e1.z) / 2

      vertices.each do |vertex|
        p1 = [x, y, z]
        p2 = vertex
        line = ents.add_line p1,p2
      end
    end    
  end
  sel.clear
model.commit_operation

Note: I also find strange that new edges don't intersect with each othere making a new vertex...why is this?