[Plugin] Select by Z

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:

Execute the plugin
Enter a value on the VCB OR select an edge or a face
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.