Resolved What is the difference between UnityEngine.Quaternion and Unity.Mathematics.quaternion?

I heard that Unity.Mathematics.quaternion is more effective in BurstCompiled code than UnityEngine.Quaternion, but I am not sure. Also I wonder if it is okay to use Quaternion instead of quaternion, as the first one has much more functions in it?

 

If you want to use burst, you need to use math.quaternion.
Otherwise you loose your performance opportunity.
And yes quaternion has fewer methods than Quaternion. But some these are relocated in different part of math library.
Usually it enough for most of your game logic. Also other burst compatible libs are available online, on various sources.

 

Burst can generate more performant code if being precise.

Quaternion will work just fine as any struct inside Burst compiled code would. Just not as performant as quaternion counterpart. Speedwise - depends on what kind of operations are performed and number of them. Sometimes there's no (or minimal) difference at all.

math lib works as a "hint" for the Burst compiler.
Sometimes its just smart enough to figure out what's going on based on data types of underlying operations.