How to highlight the contact area between two buffergeometry Mesh (or else two stl objects) in Three.js

[vishalgala]

I am trying to highlight the contact area of two objects (for eg. Bone and Guide). Even after hiding the guide the contact area of the guide on the bone should be highlighted. I’ve tried using CSG Geometry to get the intersected area into a mesh and then highlighting it but in that process the browser always displays out of memory message. Any ideas or implementations which may help?