@tig said:

First, your code...
which I assume is just a sample...

door_width = 3
makes it 3" wide

door_width = 3.feet
makes it 3' wide !
etc...

I.E. force the use of a 'length', rather than passing a default 'number' - which SketchUp always interprets as inches !

Also... you'd probably be better off adding a new group into model.active_entities and then adding your new geometry into that group.entities

Currently your code draws a rectangle on the ground [Z=0 - and 0 is 0 in ALL length-units!] and then you extrudes it downwards by -1["]...
If you wanted -1' then use -1.feet etc

AND... you haven't actually explained 'how' you want to 'offset a face' !?
Your code uses 0 for all of the Z values used in the rectangle's corner-points, but of course you could use any value for those Z's - but remember that they should be set to the same length if a valid 'flat' rectangle is to result...

now i know in Sketchup API , there is no method to offset a face.... but i thought to offset a face like this..... pl.offset 1, to get a border of 1" width

i have the same problem... not to offset a edge... but offset a face in ruby code
i hope TIG have a solution for this issue
see example

Set the house dimensions (in feet)

@num_windows = 4
door_width = 3
door_height = 7
house_height = 9
house_length = (@num_windows + 1) * (door_width + 2) + 2
house_width = 10
roof_height = 2

ents = model.entities

  pl = ents.add_face([0, 0, 0], [0, house_length, 0],
     [house_width, house_length, 0], 
     [house_width, 0, 0], [0, 0, 0])
	 pl.pushpull -1

Hi There, i wonder..... when you make an group with ruby in sketchup.... you can explode
that group.... but is it possible to make the same group egain...???
can anyone help me...?

see the following simple exaample

#create a group and add a line into the group
model = Sketchup.active_model # Open model
entities = model.entities # All entities in model
selection = model.selection # Current selection
group = entities.add_group #make emplty group

#create a line in group
line = group.entities.add_line [0,0,0], [100,50,20]

#explode group
group.explode