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  How to reflect an object, with constant acceleration, when hitting a circle?  (Read 1341 times)
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Offline tom_mai78101
« Posted 2012-10-20 15:55:57 »

A few weeks ago, I learned about reflection, R = V + N*(V‧N). It works with velocity, and so far, I have no problems with it. Now I am expanding it further, by applying it to an object with a constant acceleration hitting towards a Pinball Bumper. That's right, a bumper with the ability to knock objects away with a higher velocity.

  • O is an object with a constant acceleration heading west,
  • B is a circular bumper on the path of O, and it doesn't move,
  • A(O) stands for the old acceleration vector of the object,
  • V(O) stands for velocity vector of the object, and
  • P(O) stands for position vector of the object, and finally,
  • A'(O) stands for the new acceleration vector of the object.

My current draft is:

normalize(N), where N is normal vector of (O hit B)'s point of collision.
R = A(O) + N*(A(O)‧N)
A'(O) = R - A(O)
V(O) += A'(O)
P(O) += V(O)

The problem for me is the object, O, instantly warped away from Bumper and constantly stays moving in a westward direction, instead of (moving eastward, slowing down, changing directions, speeding up westward, and repeat the cycle).

Does anyone know how to fix this? I hoped I have provided sufficient information. Thanks in advance.
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