with this open library can I substract models like this video http://www.youtube.com/watch?v=GwT7Vk0KEzs?
I always use XNA library, but I can't substract with this...
A lor of thanks!
Like XNA does with Direct3D, OpenTK just offers acces to a graphics API, here OpenGL. No application logic whatsoever is included in this. If you want to create a CSG (Constructive Solid Geometry) application, this has (almost) nothing to do with the graphics API you use for rendering. Of course you can create such an application with both XNA and OpenTK, but you have to program the CSG functionality yourself.
try the example launcher for a way to do CSG using a stencil buffer in realtime, depending on your needs it may be sufficient? (you can do that trick with DX/XNA too ofc)
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