Write all faces id's and point information to text file

neon_daytona

Hi All,
I am looking for a plugin/script to loop through all the faces (All faces are in XY plane), get the 2 extreme points on the bottom edge of the face and give the distance between the 2 points.
I need to write this output to a text file in this format
Face No, dX, dY.
1, 0.5, 2

I have attached an image that might help show what is required.
The face may be of any shape. The arrows are to show the direction to measure dX and dY. All faces on either side of the reference line (white in middle of image) will need to be calculated in that direction. The green colour dots indicate the points. There can be intermediate points on the lower line of each face, but I need to pick only the extreme points on that line for dX and dY
Is this possible?

Thanks in advance

TIG

As all faces are oblong and 'flat' it's even easier...
A face has a 'boundingbox'.
bb=face.bounds
A 'boundingbox' has various properties, including
dX=bb.width dY=bb.height
which would be the values you want.
You either use 'selection' or all for collecting the faces - let's assume 'all'
` faces=[]
Sketchup.active_model.active_entities.each{|e|faces << e if e.class==Sketchup::Face and e.normal.z.abs>0.9999}
text="No,dX,dY\n"
num="1"
faces.each{|face|text << num+","+face.bounds.width.to_s+","+face.bounds.height.to_s+"\n"; num.next!}

now write text to the file

file=File.join(Sketchup.active_model.path, Sketchup.active_model.title+"_FaceDump.txt")
fi=File.open(file, "w")
fi.puts(text)
fi.close`
This should then find all flat faces and add their dX/dY values as a comma separated list, the ref 'num' is as 1,2,3...

neon_daytona

Thanks for the quick reply.

There is no selection of faces. All the faces have to be written out. So your code should work.

dX and dY in my case are not the width and height of the face.
Basically I need these 3 steps:

Select a face.
Select the extreme points for that face at its bottom. (Point 1 and Point 4 in the attached image)
difference in coordinates for these 2 points is my dX and dY.

Need to do this for all the faces in the model

TIG

Assuming your face is an orthogonal rectangle then the dX=bb.width and dY=bb.height [oddly the 'Z-height' in the SKP is called the 'bb.depth' !]

Unfortunately your explanation is illogical.
Points 1 and 4 are dX apart [without recourse to finding their coordinates at all!]

If the face is not flat or orthogonal or a rectangle then the issue is more complex but still solvable...

Please explain a little better...

neon_daytona

@tig said:

Assuming your face is an orthogonal rectangle then the dX=bb.width and dY=bb.height [oddly the 'Z-height' in the SKP is called the 'bb.depth' !]

Unfortunately your explanation is illogical.
Points 1 and 4 are dX apart [without recourse to finding their coordinates at all!]
Points 1 and 4 are definitely dX apart but may not be in the same Y coordiante.
If the face is not flat or orthogonal or a rectangle then the issue is more complex but still solvable...
As I mentioned in my first post, the face can be of any shape.
Please explain a little better...

I guess this new image will clear the question. Sorry for the confusion.
There are 2 faces in the XY plane in the image. The first face on the left, I need dX and dY between point 1 and 4. In the second face on the right, I need dX and dY between points 1 and 6. The faces can be of any shape and have as many edges as possible.
But the common thing is that all faces are in XY plane. So I need to find the edge/line that is at the bottom of the face and pick the 2 points attached to line to get the dX and dY.

ktkoh

A question along similar lines:
I am trying to write the input data to a file named like the rb file and in the same directory as the rb file. This will provide users with their on default data not what the author picked. Currently in windows the file is written to the desktop and I have not found code to change it. Where I would like it is in .....plugins\K2WS.

Keith

TIG

Shashi

That's much clearer...
The faces are 'flat' in the Z-plane BUT can any number of vertices and you need to find the length of the edge that has a vertex that has the minimum Y value, since every vertex will have two faces the edge required is the one where its other vertex also has the minimum Y value.
One scenario not covered is what if the minimum Y vertex has two edges that both have other vertices that have the same Y - I assume we take the one with the lesser X ?
Here's some code

faces=[]
Sketchup.active_model.active_entities.each{|e|faces << e if e.class==Sketchup;;Face and e.normal.z.abs>0.9999}
### == 'flat'
num="1"
text="No,dX,dY\n"
faces.each{|face|
  pts=[]
  verts=face.vertices
  verts.each{|v|pts << v.position}
  pt=pts[0].clone
  minY=pt.y
  minX=pt.x
  pts.each{|p|
    if p.y < minY
      pt=p.clone
      minY=pt.y
      minX=pt.x
    end
  }
  ### pt is at minY vertex
  ve=verts[0]
  verts.each{|v|ve=v if v.position==pt}
  ### ve is minY vertex
  edges=ve.edges
  edges.each{|e|edges.delete(e) if not face.edges.include?(e)}
  ### 'edges' is just the face's 2 edges with 'minY'
  edge=edges[0]
  ey=edge.other_vertex(ve).position.y
  nedges=[]
  edges.each{|e|
    if e.other_vertex(ve).position.y <= ey
      nedges << e
    end
  }
  if not nedges[1]
    nedge=nedges[0]
  else
    n0=nedges[0]
    n1=nedges[1]
    if n0.other_vertex(ve).position.x <= n1.other_vertex(ve).position.x
      nedge=n0
    else
      nedge=n1
    end
  end
  ### 'nedge' is the required edge
  ps=nedge.start.position
  pe=nedge.end.position
  dX=(ps.x-pe.x).abs.to_s
  dY=(ps.y-pe.y).abs.to_s
  ###
  ### now add data to 'text'
  text << num+","+dX+","+dY+"\n"
  ###
  num.next!
  ### '1' >> '2' etc
}
### now write the completed 'text' to a file
file=File.join(Sketchup.active_model.path, Sketchup.active_model.title+"_FaceDump.txt")
fi=File.open(file, "w")
fi.puts(text)
fi.close
### done!

this is untested - please try and report back...

TIG

Keith

Your separate question....

The .rb file's details are got from the special __FILE__ variable which returns the full path the the .rb file.
So let's assume that the Ruby file is called ' keith.rb'...
Then
rb=__FILE__ >>> 'C:\Program Files\Google\Google SketchUp 7\Plugins\K2WS\keith.rb'
To find its folder use
folder=File.dirname(rb) >>> 'C:\Program Files\Google\Google SketchUp 7\Plugins\K2WS'
To find its name use
name=File.basename(rb,".*") >>> 'keith'
To compile the path to the new matching .txt file use
txtfile=File.join(folder, name+".txt") >>> 'C:\Program Files\Google\Google SketchUp 7\Plugins\K2WS\keith.txt'

NOTE: another 'one-step' way [but somewhat less clear] would be this
txtfile=__FILE__.gsub(/.rb$/,'.txt')
Which directly returns 'C:\Program Files\Google\Google SketchUp 7\Plugins\K2WS\keith.txt' without any intermediate steps...

I show the File parsing/join methods because they do have wider uses...

Remember that ' txtfile' is only a string representing the file path and you need to use the File.open... etc to make the file and write to it... See the example[s] in the post[s] below...

ktkoh

Thanks TIG That should help me out. I had already worked out the file new/open etc. but found no help on directories etc.

Keith

neon_daytona

Thanks TIG for the help.
There was one small typo, which I edited.
The text file is always saved to directory not in the active model path.
Need to verify that, But the main functionality works like a charm.

Trying it on bigger models and will then update back.

Thanks Again

TIG

Shashi

Glad to hear it helped...
I hadn't tested the code as I typed it 'cold', from memory as one stream of consciousness - can you tell me were my 'typo is' - I can then edit the original code-block so that anyone else trying to use it doesn't have to fret about sorting that out... Saving the data file with the model OR to a fixed file-path is your choice - so if that's the 'typo' then I need not worry... as I just needed a 'FaceDump.txt' file to write to...

neon_daytona

TIG,

this is the typo

minX=py.x
needs to be changed to
minX=pt.x

Thanks

TIG

Thanks! fixed it...