collision normal for physics

Hi,
Is there a way to make an object bounce backwards at the angle of the normal it just collided with?

e.g. if it hits a surface head-on it would move directly backwards,

Is there also a way of making the colliding object spin in the right direction as if it had hit the normal in real life-
e.g. if the colliding object is facing up (entitypitch compared to normal=+5) at the normal make it spin downwards (entitypitch=-5 compared to pitch of normal)

http://www.blitzbasic.com/Community/posts.php?topic=34953

; If the entity collided with the level, make it bounce.
If Entity_Hit > 0

; Calculate bounce:

; Get the normal of the surface which the entity collided with.
Nx# = CollisionNX(ballpos, 1)
Ny# = CollisionNY(ballpos, 1)
Nz# = CollisionNZ(ballpos, 1)

; Compute the dot product of the entity's motion vector and the normal of the surface collided with.
VdotN# = Vx#*Nx# + Vy#*Ny# + Vz#*Nz#

; Calculate the normal force.
NFx# = -2.0 * Nx# * VdotN#
NFy# = -2.0 * Ny# * VdotN#
NFz# = -2.0 * Nz# * VdotN#

; Add the normal force to the direction vector.
Vx# = Vx# + NFx#
Vy# = Vy# + NFy#
Vz# = Vz# + NFz#

This might help a little

so Vx is the velocity of the object right?

thanks for the help

Yes...For the X# component.

Take some time and read the information in the link that I gave you... SSwift, gave me some really good information... Have you looked at Tokamak Physics engine yet?

Regards,
Eric

yeah but this will be a lot simpler to implement, the physics isnt the focus of the game - thanks