e < 0: A COR less than zero would represent a collision in which the separation velocity of the objects has the same direction (sign) as the closing velocity, implying the objects passed through one another without fully engaging. This may also be thought of as an incomplete transfer of momentum. An example of this might be a small, dense object passing through a large, less dense one – e.g., a bullet passing through a target, or a motorcycle passing through a motor home or a wave tearing through a dam.
0 < e < 1: This is a real-world inelastic collision, in which some kinetic energy is dissipated.
e = 1: This is a perfectly elastic collision, in which no kinetic energy is dissipated, and the objects rebound from one another with the same relative speed with which they approached.
Here are gifs that illustrate the issue (all using static duration of 0.005):
0.35:
1.0:
-0.35:
Notable things:
as expected, restitution of 0.35 has the least amount of initial bounce
initial bounce looks very similar between restitutions -0.35 and 1.0
highest jump of 4th sphere appears to occur with restitution 0.35
lowest jump of 4th spears appears to occur with restitution 1.0
1.0 still appears to damping the bounce a lot even though it should mean no modification to restitution calculations
negative restitution still produced a bounce; I guess this happened because objects penetrated so the bounce was secondary
Just from fiddling around with the value, it looks like with current demo the sphere jumps back to original position with restitution coefficient of 48.88 or thereabouts but only for the weight of 1. Increasing weight makes the sphere jump higher on each collision.
Unexpectedly small difference between restitution coefficients of
0.35,1.0and-0.35https://en.wikipedia.org/wiki/Coefficient_of_restitution says the following:Here are gifs that illustrate the issue (all using static duration of 0.005): 0.35:
1.0:
-0.35:
Notable things:
0.35has the least amount of initial bounce-0.35and1.00.351.01.0still appears to damping the bounce a lot even though it should meanno modification to restitution calculationsJust from fiddling around with the value, it looks like with current demo the sphere jumps back to original position with restitution coefficient of
48.88or thereabouts but only for the weight of1. Increasing weight makes the sphere jump higher on each collision.