bjornbytes
Issue with Joint initialization
Background: In Jolt, when you create a slider, you have to specify a frame of reference for both colliders. This consists of a point (can be in world space or relative to the collider), a slider axis, and a normal axis.
We currently aren't specifying the 2 points at all, they're both at 0,0,0, which causes sliders to not behave as expected. There's an option called AutoDetectPoint, but we don't use it. I tried using it, but it picks a single anchor point between the two colliders, weighted by mass, which maybe isn't very useful. Instead, LÖVR should probably use the positions of the 2 colliders as the 2 points.
Additionally there's the issue of the slider axis and normal axis. We currently use a helper function SetSliderAxis for this, which computes the normal axis as any vector perpendicular to the main slider axis. This is probably okay.
Similarly, we don't set the hinge normal axes. We should set both of those to be perpendicular to the hinge axis.