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Math Help - Reflection around normal with radians

  1. #1
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    Reflection around normal with radians

    Hello,

    I need to reflect an incidence vector around a normal. The hypotenuse of the incidence vector is a fixed value, and I have the radian value of the angle it takes. I also have the length of the normal, and the corresponding radian value. Is there a way I can calculate the refraction vector in radians? A friend told me I could use R = -2(N*I) - I, but this does not produce the correct results.

    Thanks in advance for your help.

    Edit:

    Apologies if I am being unclear. I have an object with speed 'x', traveling at angle . It collides with the internal edge of a circle at position (y, z). The normal is then, therefore, atan( (y - circle midpoint y) / (z - circle midpoint z)). How can I then find out the resultant vector if the object is to 'bounce' off this point?
    Last edited by hasekura_rokuemon; July 15th 2008 at 06:57 AM. Reason: Further explanation
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