Feature request: local position/rotation to a reference entity

[LeXXik]

This is a feature request to get local position/rotation of an entity in another entity's local frame. Something like:

entity.getLocalPosition(referenceEntity /* optional */,  resultVec3 /* optional */)
entity.getLocalRotation(referenceEntity /* optional */,  resultQuat /* optional */)

[LeXXik]

Since both position and rotation are usually needed, its probably better to calculate them in one go, so a new API would probably be preferred, e.g.:

entity.toLocal(referencedEntity, resultVec3, resultQuat);

[mvaligursky]

Would not not simply:

• convert position to world space using entity's getWorldTransform
• invert getWorldTransform of your destination entity, and multiply that world transform by it, to get it in the local space

Not sure we need a new API for this?

[mvaligursky]

I guess rotation might be more tricky. Either way, I think this would be more of a math library api, and not entity.