hello i am trying to selected inner faces for wall , i used this code

mod = Sketchup.active_model # Open model
ent = mod.entities # All entities in model
sel = mod.selection # Current selection
faces = (sel[0].entities).grep Sketchup::Face
cf = (faces[0].all_connected).grep Sketchup::Face

Yea, you need to filter of the faces you want based on some distinguishable properties.

In this particular case we can use the fact that the inner faces will be connected to the inner loops of the bottom or top face.

module Example
# Example.get_inner_wall_faces_of_selected_instance
def self.get_inner_wall_faces_of_selected_instance
model = Sketchup.active_model
selection = model.selection
instance = selection.first
faces = self.get_inner_wall_faces(instance.entities)
model.start_operation('Paint Inner Walls', true)
faces.each { |face| face.material = 'red' }
model.commit_operation
end
def self.get_inner_wall_faces(entities)
faces = entities.grep(Sketchup::Face)
# First we find the top face(s).
top_faces = faces.select { |face|
face.normal.samedirection?(Z_AXIS)
}
# Now we just need to iterate its inner loops and find connected faces.
inner_wall_faces = []
top_faces.each { |top_face|
top_face.loops.each { |loop|
next if loop.outer?
inner_wall_faces.concat(self.inner_loop_faces(loop, top_face))
}
}
inner_wall_faces
end
def self.inner_loop_faces(loop, ignore_face)
faces = []
loop.edges.each { |edge|
edge_faces = edge.faces
edge_faces.delete(ignore_face) # Don't want the top face
faces.concat(edge_faces)
}
faces
end
end

thanks for response â€¦
now i am trying to using pushpull tool for inner face itâ€™s work correctly with wall on square shape and dose not with wall on pentagon or hexagon shape , after push inner faces i found intersection line on upper face and bottom face

mod = Sketchup.active_model
ent = mod.entities
sel = mod.selection
prom = ["Thikness"]
default = [""]
result = UI.inputbox prom , default , "Edit thikness"
thik = result[0].to_f
UI.messagebox thik
faces = sel[0].entities.grep(Sketchup::Face)
# First we find the top face(s).
top_faces = faces.select { |face|
face.normal.samedirection?([0,0,-1])
}
sel.clear
faces = []
edge_faces = []
top_faces.each{|top|
#UI.messagebox top.loops.length
top.loops.each{|l| next if l.outer?
l.edges.each{|e| edge_faces = e.faces
edge_faces.delete(top)
faces.concat(edge_faces)
}
}
}
faces.each{|f|
u = Sketchup.active_model.options["UnitsOptions"]["LengthUnit"]
case u
when 0
f.pushpull thik.inch
when 1
f.pushpull thik.feet
when 2
f.pushpull thik.mm
when 3
f.pushpull thik.cm
when 4
f.pushpull thik.m
else
UI.messagebox "model doesn't have unit"
end
}

You could for instance take the bottom face, and locate the points for the â€śouterâ€ť surface. Then offset this path to the new wall width and create a new face to push-pull up.
As Dan mentions, using push-pull on the vertical wall surfaces wonâ€™t work. Think of how youâ€™d do this when modelling by hand.

thank mr Dan for helping , so i am trying to use transformation .
when i selected a face i used face.normal to find direction of movement so how to find the perpendicular direction for face if a return of face.normal equal to (0.948683, -0.316228, -0)
i tried to apply transformation to each inner face like in code below but that field with error message "reference to deleted Face "

i tried to transform vertices so i found new edge appears on faces like in image

this my code

mod = Sketchup.active_model # Open model
ent = mod.entities # All entities in model
sel = mod.selection # Current selection
faces = sel[0].entities.grep Sketchup::Face
vertices = []
normals = []
newpoint = Array.new(3)
faces.each{|f|
if f.normal == [0,0,1] or f.normal == [-0,-0,1] or f.normal == [0,0,-1] or f.normal == [-0,-0,-1]
next
else
nor = f.normal
nor = nor.to_a.map!{|n|
if nor.to_a.index(n) == 2
n.to_m
else
n.to_m * (0.5).m #changes only on x and y direction
end
}
f.vertices.each{|e| vertices << e
normals << nor }
end
}
vertices.each{|v|
p = v.position
p = p.to_a.map{|p| p.to_m}
i = 0
while i < 3 do
if i == 2
newpoint[i] = p[i]
else
newpoint[i] = p[i] + normals[vertices.index(v)][i]
end
i +=1
end
vect = p.vector_to(newpoint)
vect = vect.to_a.map{|v| v.m}
tr = Geom::Transformation.new(vect)
sel[0].entities.transform_entities tr , v
}

i tried to transform vertices so i found new edge appears on faces like in image

this my code

mod = Sketchup.active_model # Open model![t|690x338](upload://d9qk6rNu8EzeEetY9g9Bp6Xsd7w.png)
ent = mod.entities # All entities in model
sel = mod.selection # Current selection
faces = sel[0].entities.grep Sketchup::Face
vertices = []
normals = []
newpoint = Array.new(3)
faces.each{|f|
if f.normal == [0,0,1] or f.normal == [-0,-0,1] or f.normal == [0,0,-1] or f.normal == [-0,-0,-1]
next
else
nor = f.normal
nor = nor.to_a.map!{|n|
if nor.to_a.index(n) == 2
n.to_m
else
n.to_m * (0.5).m #changes only on x and y direction
end
}
f.vertices.each{|e| vertices << e
normals << nor }
end
}
vertices.each{|v|
p = v.position
p = p.to_a.map{|p| p.to_m}
i = 0
while i < 3 do
if i == 2
newpoint[i] = p[i]
else
newpoint[i] = p[i] + normals[vertices.index(v)][i]
end
i +=1
end
vect = p.vector_to(newpoint)
vect = vect.to_a.map{|v| v.m}
tr = Geom::Transformation.new(vect)
sel[0].entities.transform_entities tr , v
}

I saw your previous post. It is not respectful to flood the topic with duplicate posts.
I am busy and not able to participate further in this discussion.