Collision Question

Blitz3D Forums/Blitz3D Beginners Area/Collision Question

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How do you set (CollisionX,CollisionY,CollisionZ)'s Index?

I keep getting an "Index out of range" Error.
And there are no examples with these functions in the command reference.
Also, As I move across a 3D terrain every time I get to a steep hill the camera shows
the inside of the hill instead of the surface.
I use the collision command slide2 mode.
How would I get the camera to automatically go up when it gets to a steep hill
and then decend again when I go down, I think checking CollisionY is the way to go.
What is the best way to do it. Thanks in advance.