Awesome

Unity3D-Plane-Clipping

Plane clipping shaders for Unity3D 5.3.2+. Extends the Standard shader!

Now it works with the specular setup as well!

example

Attach the "ClippableObject" script to an object.

It will replace the material of the object with a "clippable" standard material.

If you'd like to reuse the properties of your material (as long as it's based from standard material) this comment may be of help !