When using a vray camera and activating the clipping plane, the vray toon process seems to disregard the clipping plane. Altering the geometry through cutting holes or adding slice modifiers isn’t an option as there are several cameras in the scene and reflective surfaces that must show the wall the camera is behind.
Is this a known issue?
yes its an issue. The vraytoon is an environmental effect, so I’m not sure its possible to get around.
Re: toon and clipping plane
It is now 
I’ll see what can be done about it.
Best regards,
Vlado
So this is corrected now for the service pack.
Best regards,
Vlado
That’s great news! How does a person go about incorporating this fix?
my pappy always said, ‘fixes make the best workarounds.’ 
You can email me to vlado@chaosgroup.com
Best regards,
Vlado