[Plugin]ArcCurve-set_segments.rb & changearcsegments 130830

pilou

For the volumes 3D from Autocad does it possible to make the same thing?

Something like this in the Widows box option of SU importation : give minimum angle between facets
(so numbers of segments of arcs will be limited by this value)
But I don't know how is managed entities
I suppose 2 circles connected but...

here a cylinder from autocad

cylinder.zip

TIG

Unfortunately SUp doesn't allow [easy] editing of many of the properties of arcs or circles it they form parts of complex 3D shapes... Changing an arc or circle could change so many other things that are connected to it that it would quickly become unmanageable ! So, you cannot change the number of segments in an arc or circle using Entity Info IF it has connected faces that aren't coplanar with the arc/circle itself... My new 'method' has the same limitations...

Sorry...

pilou

Well, Nevemind!
Maybe something to make by "exploding" object in Autocad

pilou

All this don't arrive if you use Moi
Here a simple cylinder with a hight number of segments
(limit of the 24 segments default is overpassed
And you can control the aspect of polygons before exportation!
Exportation is in SKP format of course!

Chris Fullmer

That is one of the key differences of solid modeler vs. face modeler.

TIG

Here is an updated version http://forums.sketchucation.com/viewtopic.php?p=158903#p158903
e.g. arcCurve.set_segments=6

You will need both of the rubies that are attached there...

The new file, ArcCurveTests.rb, includes three new methods is_loop?, .is_circle? and .is_polygon? - these methods are not accessible through Ruby otherwise...

They are used to determine the original ArcCurve's underlying 'type' [Arc/Circle/Polygon] and then use that to remake the geometry with the new segment/sides count as the right 'type' [previously any Circles/Polygons that were changed by this method became 'Arcs' !]...

EDIT: ArcCurveTests.rb updated... 20091002

thomthom

Some of these methods can be simplified with the aid of Curve.is_polygon? added in Google SketchUp 7.1 - Maintenance 1.

Here's a set I made for my TT_Lib:


	def self.is_curve?(entity)
		return false unless entity.is_a?(Sketchup;;Edge) && entity.curve
		return false if entity.curve.respond_to?(;is_polygon? ) && entity.curve.is_polygon?
		return true
	end
	
	def self.is_arc?(entity)
		return self.is_curve?(entity) && entity.curve.is_a?(Sketchup;;ArcCurve)
	end
	
	def self.is_circle?(ent)
		# (i) A bug in SU makes extruded circles into Arcs with .end_angle of 720 degrees when reopening the file.
		# Instead of checking for 360 degrees exactly, we check for anything larger as well. A 2D arc
		# can't have more than 360 degrees.
		#
		# This doesn't work. Maybe due to rounding errors?
		# return (arc_curve.end_angle - arc_curve.start_angle >= 360.degrees) ? true ; false
		return false unless self.is_arc?(ent)
		return ((ent.curve.end_angle - ent.curve.start_angle).radians >= 360) ? true ; false
	end
	
	def self.is_polygon?(ent)
		return ent.is_a?(Sketchup;;Edge) && ent.curve && ent.curve.respond_to?(;is_polygon? ) && ent.curve.is_polygon?
	end
	
	def self.is_ngon?(ent)
		return false unless self.is_polygon?(ent) && ent.curve.is_a?(Sketchup;;ArcCurve)
		return ((ent.curve.end_angle - ent.curve.start_angle).radians >= 360) ? true ; false
	end

SU versions prior to this .is_polygon? will not be able to tell a Circle or Polygon apart, but no error is thrown.

TIG

Here's an updated version that avoids other method clashes... http://forums.sketchucation.com/viewtopic.php?p=158903#p158903
IF you have the older script ArcCurveTests.rb installed please remove it as it might clash with some other methods...

eskis

great! great! great! that is what i was looking for!!!!!!
thank you...

ahnvtk

I've tried making a script that automatically creates an 8-sided circle in a group at sketchup start, to see if all circles created by a user would then be 8-sided as well. They aren't - scripting an 8-sided circle still leaves the default sides at 24.

I tried changing the sides of a circle with this script as well - Sketchup still leaves the default at 24.

How can I change the default sides of a circle?

TIG

You can't.

ahnvtk

At least this script here just saved me time reducing polys from extruded circles.. thanks!

boilingsnow

TIG it's nice of you to share this with us. I think this ruby is very useful but it's convenient to use because everytime I have to type "changearcsegments NNN" in the ruby console...Why not make it possible to be added in the plugin menu and works with a popup window to type in the segment number.

TIG

Edit the script with a plain-text editor [Notepad/Notepad++.exe] and add this code at the end

unless file_loaded?(File.basename(__FILE__))
  UI.menu("Plugins").add_item("Change Arc Segments"){
    segments=inputbox(["Segments; "],[12],"Change Arc Segments")
    changearcsegments(segments[0])if segments
  }
end
file_loaded(File.basename(__FILE__))

boilingsnow

@tig said:

Edit the script with a plain-text editor [Notepad/Notepad++.exe] and add this code at the end

unless file_loaded?(File.basename(__FILE__))
>   UI.menu("Plugins").add_item("Change Arc Segments"){
>     segments=inputbox(["Segments; "],[12],"Change Arc Segments")
>     changearcsegments(segments[0])if segments
>   }
> end
> file_loaded(File.basename(__FILE__))

Thank you!

LorenzoS

Hi!

Is Anyone so kind to tell me how to use this plug-in.

I get an error that says
Error Loading File ArcCurve-set_segments=.rb
no such file to load -- ArcCurveTests.rb

any help?

thx!
p.s.
I downloaded the script from the first post.

TIG

It doesn't even use ArcCurveTests.rb or mention it in its code - in fact in earlier posts [in this thread] you are recommended to remove that very file from your Plugins folder, because changes to the API have meant that it might clash and updates of this tool no longer need it anyway.
So it is not 'required' by the recent versions of this script...
Your error message leads me to think that you have an old version of the tool loading...
Are you sure you have got the latest one in the Plugins folder? Windows Vista/Win7 can 'play tricks' if you don't have full access rights to the Plugins folder - it looks like you have added/updated a file/subfolder... but there's a 'Compatibility Files' button added to the folder's window-bar and they have actually gone into a side folder, IF you haven't got full security access rights to a folder [right-click context-menu Properties > Security]

Here's the latest version http://forums.sketchucation.com/viewtopic.php?p=158903#p158903
It has the Plugins menu item added to the code as discussed a few posts back...
Download the latest file from this link.
It should make a Plugins menu item which opens a dialog into which you type the number of arc segments required to process all selected arcs/circles...

theotses

Hi!

I downloaded the plugin and istalled it. I have a big drawing with many arcs and is nearly impossible to select them all. So i select the whole drawing as i imported it and then i use the plugin. But the plugin works only with some of the arcs and the others remain with the default number of segments.

How can i use the plugin on all the arcs?

Thank you in advance.

TIG

SketchUp's Arcs/Circles can have their 'segmentation' set as they are made OR later on by using 'Entity Info', OR bu using this tool.
BUT Arcs that have been scaled, exploded into edges OR are now incorporated into 3d geometry [extrusions etc] are never changeable.
So if you can't change your Arc's segmentation using 'Entity Info', then you can't change it with anything else either: its properties have been fixed by your earlier actions.

theotses

I can change the segmentation from entity info but the arcs are too many. So I tried to select the whole drawing and change the segmentation with the tool but only few of the arcs got the segments I wanted.

[Plugin]ArcCurve-set_segments.rb &amp; changearcsegments 130830

[Plugin]ArcCurve-set_segments.rb & changearcsegments 130830