On 7/13/2011 1:55 AM, Le_Forgeron wrote:
> Le 13/07/2011 04:57, Some Yahoo nous fit lire :
>> I'm looking for a way to calculate the bounce off the interior of a
>> sphere...
>>
>>
>> I have a position, a velocity vector and my sphere is hollow and
>> centered at the origin.
>>
>> I'm pretty sure that Velocity=-Velocity is not right, though in my head
>> it seems logical.
>
> Velocity := -Velocity is correct only when position&  Velocity are
> aligned (you came through the center of the sphere, you go back to it)
>
> For other positions, you need to find the intersection point on the
> sphere and mirror the velocity in regard to the normal of the sphere at
> that point.

ok, lets pretend I failed 3D calculus...

Sphere is <0,0,0>,100

I can use VDist to see when the marbles hit  each marble has

position (vector)
velocity (vector)

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