[Plugin] Select by Z

[MartinRinehart]

@earthmover said:

I had a few times this week that I needed to select all the faces at a given height ...

Have you visited the Ruby Console? You could get this done there without waiting on a Ruby.

[TIG]

@earthmover said:

Just wondering if this were possibly still in the works? TIG?

I had a few times this week that I needed to select all the faces at a given height and this script would've been very useful. No hurry, just wondering. Thanks!

Time flies when you are enjoying yourself...

These are the lines of code you need...

def selectfacesbyz()
  model=Sketchup.active_model
  ss=model.selection; face=ss[0]; ss.clear
  model.active_entities.each{|e|ss.add(e)if e.class==Sketchup;;Face and e.bounds.min.z==face.bounds.min.z}
end#if

[Untested !]
Paste all of it into a selectfacesbyz.rb file, restart SUp and see what happens...
Usage:
Select a face... then in Ruby Console type/paste:

selectfacesbyz

it selects every face at same height.

You can make the menu by copying similar code ?

[EarthMover]

Thanks TIG! It indeed works. I tried this for adding to the menu as an option, but it didn't work. What am I missing?

def selectfacesbyz()
  model=Sketchup.active_model
  ss=model.selection; face=ss[0]; ss.clear
  model.active_entities.each{|e|ss.add(e)if e.class==Sketchup;;Face and e.bounds.min.z==face.bounds.min.z}
### Menu ###
    UI.menu("Plugins").add_item("Select Faces by Z"){selectfacesbyz}
end#if

[TIG]

Put the menu OUTSIDE of the def...end thus:

def selectfacesbyz()
  model=Sketchup.active_model
  ss=model.selection; face=ss[0]; ss.clear
  model.active_entities.each{|e|ss.add(e)if e.class==Sketchup;;Face and e.bounds.min.z==face.bounds.min.z}
end#def
UI.menu("Plugins").add_item("Select Faces by Z"){selectfacesbyz} if not file_loaded?(File.basename(__FILE__))
file_loaded(File.basename(__FILE__))

The file_loded bit ensures it only loads into menu if you reload the Ruby manually later...

You're now a scripter !

Next: test if ss[0], test if ss[0] is a Face etc and if not UI.messagebox()... "Must Select a Face First.."

[EarthMover]

@tig said:

Next: test if ss[0], test if ss[0] is a Face etc and if not UI.messagebox()... "Must Select a Face First.."

Would this work?

def selectfacesbyz
	mo=Sketchup.active_model()
	ss = mo.selection()

	if ss.empty? 
		UI.messagebox("Must Select a Face First")
	else
		mo.start_operation "selectfacesbyz"

[TIG]

Yes, that's OK.
But I'd just use this:

###...
if ss.empty? or not ss[0].class==Sketchup;;Face
  UI.messagebox("Must Select a Face First...")
  return nil
end
### then rest of code assuming it does get past this test...

'return nil' simply stops the process...
Note how I also added a test to see if the first thing in the selection is not a Face...
You will winkle a script out of me bit by bit...

[EarthMover]

So kind my friend. Thanks for making me work for it! I'm looking through code to try and determine how to also have the selection apply to edges, but the variables for edges are greater. If I could figure out how to apply it to just work with edges that exist solely on an xy plane....

[TIG]

edge.start.position.z==edge.end.position.z

is 'flat'
you could also get the lower value with

edge.bounds.min.z

?

[EarthMover]

ss=model.selection; face=ss[0]; ss.clear

So I assume this lines tells sketchup if the selection is a face then process this line

model.active_entities.each{|e|ss.add(e)if e.class==Sketchup::Face and e.bounds.min.z==face.bounds.min.z}

And this says to add to the selection all other faces with the with z bounds.

To translate this to apply for edges, is it as simple as changing the name face to edges and defining it further with the xy constraint code you provided? I tried it a few different ways and I keep getting errors.

[TIG]

Correct - test that the entities are Edges...

e.class==Sketchup;;Edge

Then test to see if same height as edge=ss[0] ###you need to have got edge's min.z...
There are several ways of testing for entity types - the [probable] fastest is e.class==Sketchup::Edge but there are also
e.is_a?("Edge") e.kind_of?("Edge") e.typename=="Edge"
etc...
Now you can also try code to manipulate a selection so that say only edges or faces are left in it...
For example:

ss.each{|e|ss.remove(e) if not e.class==Sketchup;;Face}### leaves only faces
### OR
ss.each{|e|ss.remove(e) if not e.class==Sketchup;;Edge}### leaves only edges

[EarthMover]

def selectedgesbyz()
  model=Sketchup.active_model
  ss=model.selection; Edge=ss[0]; ss.clear
  model.active_entities.each{|e|ss.add(e)if e.class==Sketchup;;Edge and e.bounds.min.z==edge.start.position.z==edge.end.position.z}
end#if
UI.menu("Plugins").add_item("Select Edges by Z"){selectedgesbyz} if not file_loaded?(File.basename(__FILE__))
file_loaded(File.basename(__FILE__))

Got this so far. Something is wrong in the syntax. Can you show me the error to my ways. I have no idea how the language works, but it's been a good mental exercise and I'd love to learn more. Thanks for your help.

[BTM]

@earthmover said:

def selectedgesbyz()
>   model=Sketchup.active_model
>   ss=model.selection; Edge=ss[0]; ss.clear
>   model.active_entities.each{|e|ss.add(e)if e.class==Sketchup;;Edge and e.bounds.min.z==edge.start.position.z==edge.end.position.z}
> end#if
> UI.menu("Plugins").add_item("Select Edges by Z"){selectedgesbyz} if not file_loaded?(File.basename(__FILE__))
> file_loaded(File.basename(__FILE__))

Got this so far. Something is wrong in the syntax. Can you show me the error to my ways. I have no idea how the language works, but it's been a good mental exercise and I'd love to learn more. Thanks for your help.

Well, first problem is that you capitalized edge in edge=ss[0]. Second, you can't have something like 'if a==b==c'. You have to seperate it into 'if a==b and a==c'. Here's a working example.

def selectedgesbyz()
  model=Sketchup.active_model
  ss=model.selection; edge=ss[0]; ss.clear
  model.active_entities.each{|e|ss.add(e)if e.class==Sketchup;;Edge and (e.bounds.min.z)==(edge.start.position.z) and (e.bounds.min.z)==(edge.end.position.z)}
end#if
UI.menu("Plugins").add_item("Select Edges by Z"){selectedgesbyz} if not file_loaded?(File.basename(__FILE__))
file_loaded(File.basename(__FILE__))

[TIG]

Thanks - BTM ... all variables must start with a lower-case letter and test 'x==y and z==a' are both the correct way forward... We'' make a scripter out of EarthMover yet

[EarthMover]

Thanks BTM - that makes sense and I follow the logic behind the code. Perhaps I will try and find time to learn the language. I am good at obsessing and not so good at multi-tasking, so it may have to wait till the snow is falling and my work slows down.

Regarding the script, it indeed is working. However, it is not properly defining the edges end bounds. The script is selecting any edge which has one of the their bounds (verticies) corresponding with the selection, so it is thus selecting also vertical lines and diagonal lines who's start bounds is on the Z in relevance to the selection. Any suggestions for further defining the end bounds so that the script will only select lines only completely on the same XY plane as the selection?

[BTM]

@earthmover said:

Thanks BTM - that makes sense and I follow the logic behind the code. Perhaps I will try and find time to learn the language. I am good at obsessing and not so good at multi-tasking, so it may have to wait till the snow is falling and my work slows down.

Regarding the script, it indeed is working. However, it is not properly defining the edges end bounds. The script is selecting any edge which has one of the their bounds (verticies) corresponding with the selection, so it is thus selecting also vertical lines and diagonal lines who's start bounds is on the Z in relevance to the selection. Any suggestions for further defining the end bounds so that the script will only select lines only completely on the same XY plane as the selection?

Ah, here:

def selectedgesbyz()
  model=Sketchup.active_model
  ss=model.selection; edge=ss[0]; ss.clear
  model.active_entities.each{|e|ss.add(e)if e.class==Sketchup;;Edge and (edge.start.position.z)== (edge.end.position.z) and (e.bounds.min.z)==(edge.start.position.z) and (e.bounds.max.z)==(edge.start.position.z)}
end#if
UI.menu("Plugins").add_item("Select Edges by Z"){selectedgesbyz} if not file_loaded?(File.basename(__FILE__))
file_loaded(File.basename(__FILE__))

[EarthMover]

Thanks BTM! It's working great. I see defining the max bounds for the edges was the trick!

[conconbrr]

Hello,

I was searching for long for such a plugin. So, first of all thanks for it, it's quite useful to select all the contour lines at one level (topography).

I just wondered if it is possible to make a small improvement on the execution procedure.

In addition of the current method (select one edge or face and then execute the plugin), could it be possible to execute the plugin first and then enter a Z value on the VCB (I don't know if the name is correct, the little box on the right bottom ) and finally validate with "enter"?

In order to keep the current method, the general procedure could be:

1. Execute the plugin
2. Enter a value on the VCB OR select an edge or a face
3. Push "enter"

At each step some short information could be displayed on the status bar.

I just discover ruby and its power and unfortunately I don't really have the time to learn it so that I can make this modification.

Thank you

[ricomon35]

Any chance to get a rbz version that can b installed in 2019 or higher?

[Box]

The version in the extension store by Tig works in newer versions.