Fix the calculation of the angular velocity

[fabriceci]

Fix #63004

before this patch:

before.fix.mp4

after this patch:

after_fix.mp4

Description

The angular speed calculation was wrong when the rotation speed was not enough.

In Basis::get_axis_angle, the first condition tested an epsilon of 0.01.

For example, by rotating on Y by 0.005 radians per frame (which is not that slow as you can see in the video) which correspond to an angular velocity of (0, 0.600408, 0), you end up with a difference for Math::abs(rows[2][0] + rows[0][2] of 00999993085861 (and sometime 0019999993965 which explain with in this speed, the cube is moving a bit), so when the value is lower than the epsilon, the function don't return an angular velocity.

test project: bug-rotation.zip

[reduz]

looks ok to me, @aaronfranke what do you think?

[akien-mga]

I assume this might be needed for 3.x too? It has the same code.

[fabriceci]

@akien-mga indeed, the bug is also present in 3.x.

[akien-mga]

Thanks!

[akien-mga]

Cherry-picked for 3.5.

[and-rad]

Is what we see in the "after_fix" video expected behavior? The cube doesn't rotate with the platform and is always facing the same world-space direction.

[fabriceci]

@and-rad Yes, currently only rotation velocity (displacement) is taken into account. I proposed to add the rotation (angle) as well in the near future.