[UE5] SOL: Enchant

[zxhxy]

Hey @spiritovod, a large portion of the animations are facing the wrong direction, somewhat similar to the issue with RF Online Next. Could you take a look?

[zxhxy]

@zxhxy: I could create a fix specifically for this game, but I would prefer some more general solution, which requires more time for testing. Could you please tell if you ever bumped in similar issue in other UE5 games rather than RF Online and this one (with animations that are clearly not additive ones).

So far, in my testing, only these two games have this issue, and it only appears in certain parts of the content; not all characters are affected.

I'm also puzzled about the cause of the problem. However, after trying to import it into other software, I discovered that all the problematic animations have a 90° flip along the x-axis in world coordinates. Correcting this to 0 restores the correct behavior.

[zxhxy]

@zxhxy: There are at least two other games with such problem, Architect and Eriksholm (though Architect is somehow fixed in current build). Unfortunately it's only part of the issue and you're fixing the result, not the cause. From my understanding, the core of this problem is that retargeted animation may have linked reference pose, which is different from used in the referenced skeleton. It's not currently being parsed, as UE5 build is omitting most properties. And upon restoring stripped reference pose (bind pose) for an animation from referenced skeleton instead of the linked one, result may be all over the place. I'm just trying to mitigate the issue on post-processing phase instead of modifying output, which may bring other possible issues in the future.

This is indeed a rather complex problem. I'm thinking, since we can't resolve the reference pose that references the bones, could we establish a detection mechanism to handle problematic animations? Using the root node of the reference pose as the standard value, if the attached animation causes the value of the root node to change, then correct that value to the standard value of the reference pose (only the root node needs to be modified).