How to Detect Faces Using Ruby

how to know face contain another face with ruby api in sketchup

This can be determined by comparing the loops that make up the face.

Face.outerloop will return the loop that bounds a face (excluding any internal edges). Face.loop returns all of a face's loops including inner and outer.

So, by getting a list of all connected faces (using the example code with all_connected that you posted), you can iterate over those faces to determine if any of faceA's outerloop is shared by the iterated face. If so, it is not an inset face, rather it is adjacent.

There is an alternative method posted here that might be a good way to go too: https://forums.sketchup.com/t/how-to-know-that-a-face-contains-another-face-using-ruby-api/21840/3

Note, in the linked post, they comment that you can't directly compare loops, but you can compare edges (which compose a loop).

Is there any image recognation gem/ plugin for ruby on rails?

I haven't tried the library myself yet but

https://github.com/jeffrafter/ruby-opencv

has a short example code section on face recognition - although I think this is the source used for the RubyGem OpenCV (or at least a fork of the original), neither has been under development for quite a few years.

http://rubygems.org/gems/opencv

gem "opencv", "~> 0.0.7"

if you need more up-to-date features maybe try

https://github.com/amarburg/opencv-ffi

Although you will need to import the modules into your public folders (or whichever folder you are using to import external code from - it varies with Rails version), and then follow the example code.

Quickest Way to create Face and Edge objects in Sketchup

I found add_faces_from_mesh and
fill_from_mesh to be much faster but I
end up with a mesh consisting of
Surface instances instead of the Face
and Edge objects I am looking for.

Calling add_faces_from_mesh or fill_from_mesh with the smooth_flags parameter explicitly set to zero correctly constructs Face and Edge objects. Sketchup Documentation claims that smooth_flags defaults to zero... my trials show otherwise.

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