Irrlicht Engine

That would work, but a bit of a hack!

Yes, that would have allowed to hack around it. And certainly one could work with ID's. But I couldn't figure out a reason that it behaved like it did, so I suppose changing it was better.

So IYO the correct solution is to add the function isVisible to ICameraSceneNode so that it simply returns false?

I had changed the ISceneNode root class function to check if it was a camera node, but then that impacts all classes derived from it, which is a slight extra overhead on all nodes.

I won't stop you from doing that - might work for your case. But my solution was to change the boundingbox and the collision code. You can update to new svn if you want to use that.

Okay, that sounds good. I always have a problem finding these patches in the SVN, its like a back hole for me! Any chance of a link to the new source?

This patch is here: https://sourceforge.net/p/irrlicht/code/5094/
It also contains a bunch of spelling fixes and adapting of the tests.
The changes that matter are CCameraSceneNode.cpp, CCameraSceneNode.h and CSceneCollisionManager.cpp

Or check-out svn trunk itself and work with that.

Thanks, I'm still using 1.7.3 so I'll just patch in those changes for now.