1. ## Reflection

An vector moving at speed c at angle ø has the x component of $c * sin(ø)$ and the y component of $c * cos(ø)$. It collides with a point on a circle (y, z).

How do I establish the reflection angle of the vector hitting the circle at this point, so that the object 'bounces' off the tangent of the circle?

2. Originally Posted by hasekura_rokuemon
An vector moving at speed c at angle ø has the x component of $c * sin(ø)$ and the y component of $c * cos(ø)$. It collides with a point on a circle (y, z).

How do I establish the reflection angle of the vector hitting the circle at this point, so that the object 'bounces' off the tangent of the circle?
I'm not certain of what you mean. If the reflection "bounces" the object in the direction tangent to the circle then the object must be moving along this tangent line. Since I doubt the question is this, some clarification is needed.

-Dan

3. Maybe this image will help explain what I mean. I apologise for not being able to make it clear with words, this is by no means my area of expertise.