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reflection angle

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hi all, am back again with a minor math question. given a orientation, how do find the reflection orientation for the same. assume, i hit a wall with a particular heading value and once an intersection is found, i would like to rotate the object along its reflection vector. hence, how do i compute the orientation of such a vector ?. .kavitha

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I believe the reflection vector is the same as the angle of incidence(assuming no friction / other forces acting on it). I'm pretty sure the surface's normal must be used in the calculation. V' = (N dot V) * V ...or maybe V' = -(N dot V) * V.. its been a while. Can anyone back me up on this?

[EDIT]

Vf = Vi - 2(N')

N' is Projection of Vi onto N

N' = N(N dot Vi)

[/EDIT]

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