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fixed intersect.bounce_off bouncing if the velocity was already going away from the normal

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Max Cahill 2022-01-20 17:37:40 +11:00
parent 658c8e7117
commit c0847e1955
1 changed files with 8 additions and 5 deletions
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3
intersect.lua
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@ -508,11 +508,14 @@ function intersect.bounce_off(velocity, normal, conservation)
conservation = conservation or 1
--take a copy, we need it
local old_vel = velocity:pooled_copy()
--heading into the normal
if old_vel:dot(normal) < 0 then
--reject on the normal (keep velocity tangential to the normal)
velocity:vector_rejection_inplace(normal)
--add back the complement of the difference;
--basically "flip" the velocity in line with the normal.
velocity:fused_multiply_add_inplace(old_vel:vector_sub_inplace(velocity), -conservation)
end
--clean up
old_vel:release()
return velocity