Forces and vectors length

OK, now I'm really mad. I doubled speed of my character - just for fun and test, and... Rays checking distance in front and sides hits colliders even if They are loooong way from character. I found, that problem is with camera direction vectors (x,y,z). Rays are cross products of camera direction and world Z axis - if camera moves, direction vector is longer, so rays too and here we go - I'm about 10m from rock and "BUM"... How can I create vector that will have same "transformation, direction" as (in this case) camera but it is own, independent length?

And the second thing, more complex. How can I avoid rigidbody bounces... like ship on the water surface for example. Is there any kind of collision margin? I do not think, that calculating tons of forces etc etc for real water simulation have sense for iPhone. I need object that smoothly slides and rock on non planar surfaces (waves).

I'm fighting with those two things from about three days I'm damn stuck (and tired ) If You can put me onto right direction (with good length ) I will be really greatfull!

Kind regards,
Mad

1) How about a normalized pointer to the camera direction vector? Normalized vectors are always 1 unit long.

2) Maybe you can use the 'terrain clamping' code in this post?

1 - hmmm, I have not normalized up vector ;/ I really need to rest.

2- thanks, looks as good idea to reveal - I will try and give You feedback