FixedConstraint doesn't expose local frames about joltphysics HOT 5 CLOSED

Yes, that's what I meant. But I can see your use case. Let me know if this becomes urgent.

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const version for GetBodyInterface has been added.

W.r.t. the Fixed constraint: I did not expose an attachment frame on purpose there as the bodies are always fixed relative to each other, so you should be setting their positions anyway to make them match (if you place the bodies in a very different position than how they're supposed to be attached then it can take pretty long before the constraint is fully stabilized - sometimes it will never fully reach the 'fixed' position). It wouldn't be really hard to support supplying a reference frame, but I'm curious why it isn't possible to place the bodies in the right position?

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Oh you mean just call SetPosition on them and then create the constraint? I guess that's a possibility, too, though I would expect that that can create other problems, like having the objects penetrate things that they shouldn't be able to. That's what the constraint would "fix" for you, by pushing things out of the way a bit more gently (I guess).

This isn't a super important request and I don't have a concrete use case at hand, mainly pointing out that it could be useful to someone and that it would be a bit more consistent to have this in the interface.

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Implemented in #166.

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Be aware that this breaks the interface of FixedConstraint! You need to call SetPoint(body1, body2) now.

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