Ok, I'm having a little problem...

I have a Car being followed by 2 weird UFO craft. I have a camera positioned and looking at a helper.  Everything is currently linked to the car as I want the camera in front of the car focused a the passenger side and the flying UFO's are flying behind the car in pursuit.

Now I want to drag the ensemble to the "spline road" so I turn on Collision Detection and attempt to drag the car ensemble down to the road.... FREEZE.... wait....

Carrara comes to its senses again... and I notice that the car has not moved... so I drag it down again....FREEZE.... same thing nothing happened.

Can someone help me clarify what it is I'm doing wrong. and how I will be able to drag the car down to touch the road without it going through?

EDIT: I guess in the end I could just punch in the numbers but I just want to know if this is typical or my procedure is the wrong way to do this.

 i suspect that the Sports Car group's camera or UFO group bounding box is hitting the ground. My first guess is the camera, though. Try scaling the camera down.

Mark

Thanks Mark, I tried your suggestion and scaled the camera... however I get the same result.
Freeze, Carrara recovers and I see there is no movement, try again and the same thing.

This occurs in both C6pro and C7pro

another screen of my scene for reference. I must have some kind of setting wrong or something.

The car is actually not touching the road in the shot tho it look like it from the angle, its still a few feet higher above the spline-road

EDIT I thought it might be the target helper so I scaled that too, but get the same result.

Ok, I did some test in another scene, and I assembled a group of objects together and added a Target helper and then a camera. Collisions work great...   created another grouped object and dragged that into the first group... still works good.

Something is odd, did a test by draging in the viper. no prob... collisions worked, then I grabbed the existing groups into the viper. WORKS...

Now here is what happens if you save the group as a car file and then create a new scene with a terrain (zeroed so its flat)

I import the car group collection.. and BOOM I get the freeze when I try to use collisions.

Now the reason I saved my car setup with the UFO's was to get everything set up in a smaller room and then import it into a larger scene to make it easier to construct my set without dealing with vast distances.

Is there a way to import prepared .car files without having this problem or is this a bug?