TIG, please, can you help me with that.

About groups, I'm not sure, if I'm doing it right.
Rectangel blocks:

group = Sketchup.active_model.entities.add_group 
entities = group.entities
ptA = [x[0+i*8], y[0+i*8], z[0+i*8]].map(&;to_f)
...
entities.add_line(ptA, ptB)
...
bottom = entities.add_face(ptA, ptB, ptC, ptD)
...
bottom.material = blockMaterial[i]
...
bottom.back_material = blockMaterial[i]
...

Similarly cylinders (just using entities.add_circle).
Is it a right way?

Now for make a drill (not a notch), I need to find a face, so I'm trying sth like this

	model = Sketchup.active_model 
	entities = model.entities

	face = nil
	entities.grep( Sketchup;;Group ).each{|e|
	  puts "Group #{e.name.empty? ? e.definition.name.inspect ; e.name.inspect};"
	  faces = e.definition.entities.grep( Sketchup;;Face )
	  if faces.empty?
		puts "  +-- No faces in group!"
	  else
		for f in faces
		  if f.classify_point(center) == Sketchup;;Face;;PointInside then
		   face = f
		  end
		end
	  end
	}

It works - it finds right face, but after, when I execute code from here http://sketchucation.com/forums/viewtopic.php?t=19556, the result is, that the block disappear and stay just a circle edge.

When I add group.explode at the end of block for making rectangles and cylinders works fine this:

	entities.each { |entity| 								# Get all entities
		if entity.typename == "Face" then					# Get all faces from entities
			result = entity.classify_point(center)
			if result == Sketchup;;Face;;PointInside then	# Get our face 
				face = entity
			end		
		end
	}

If I think properly, gourp.explore deletes that group, but I need it for use in intersect_with.
So, is this process right: delete that group via group.explode (for making drills) and before making notch, create new group of block and temporary cylinder?

I learn from this https://www.sketchup.com/intl/en/developer/docs/ and forum.

Thanks

Edit:

	baseGroup = nil
	Sketchup.active_model.entities.each{|g|
		next unless g.is_a?(Sketchup;;Group)
		g.entities.each{|f|
			next unless f.is_a?(Sketchup;;Face)
			next if f.classify_point(notchPoint) == Sketchup;;Face;;PointInside	
			baseGroup = g
		}	
	}	
	
        baseTrans = baseGroup.transformation
	
        cutGroup=entities.add_group
        cutGroupEntities=cutGroup.entities	
	dir = Geom;;Vector3d.new(-1,0,0)
	cutCircle = cutGroupEntities.add_circle(notchPoint, dir, cylinderRadius[0])
	cutFace   = cutGroupEntities.add_face cutCircle 
	cutNormal = cutFace.normal
	cutFace.reverse!
	cutFace.pushpull cylinderHeight[0]	
	cutTrans = cutGroup.transformation	
	
	cutGroupEntities.intersect_with(false, cutTrans, baseGroup, baseTrans , true, baseGroup)

	cutGroup.explode

In baseGroup variable I need to find a group where I'll do a notch - and yeah, it does not work at well (now I have just 1 block, so just 1 group, but later I'll have a lot of blocks/groups).
Then I do a temporary cylinders and trying execute intersect_with, but I'm not sure if is it correct. Can you help me?

Thanks a lot.

Ou, sorry about that.
Tig, you are right, now I'm using Sketchup 2016, just a trial version, but soon I'll use Sketchup 8, is it still possible?
For better imagination, for Ex. I've this

and I need sth like this

of course without edges.
So, now I have a object and position(center) of "imagination" drill - there's no face, but the drill will do "notch".
Can you help me?
Maybe write a example code or a little tutorial how to do it and I'll try it myself.

Thanks very much.

.. sorry for my english

Edit: I just installed SU8 and I'm not sure, but is it possible there? It looks very different, not so much in design but in functions that I can use.

Hi, I'm new in Ruby and sketch, so I learnt to do a couple of simple objects (blocks, cylinders), then I tried do a drill - it works, but I do not know how do a cut.
I can do a hole - drill if the center is in the object, but I have no idea, how do a cut, when the center is out of the object. I know just x y z position, radius and depth of the drill.

Thanks for any help.