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vasilnatalie In reply to ToadieOdie [2018-03-20 04:15:58 +0000 UTC]

> I haven't figured out why the arms do that.

What kind of twisting?  Depending on what you're talking about, I might be able to explain.

> It appears smooth

That might actually be because I was smart   (Or it might not be, I'm not sure, I wasn't smart enough to make sure it's doing things the right way.)  My goal with this has always been to be smart about the twist bones, so what I'm trying to do is saying, okay, here's the shoulder, here's the elbow, here's the wrist, let's figure out what twist is going to make the elbow bend in the correct axis.  So, maybe, my model is correcting for any deficiencies in the original motion.  Or, maybe, since I wasn't really thinking about that when I connected the rigs to each other, the motion is just smooth there anyways and I'm not doing anything

But also, my body has 10k verts, which is already high for MMD, and then I'm subdividing it twice for this render, making it a grand total of 160k verts, which would choke MMD.  That gives me a lot more room to smooth out any arm twist.

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ToadieOdie In reply to vasilnatalie [2018-03-21 20:07:27 +0000 UTC]

I'm talking about how sometimes you set two frames that involve arm motion and then when you hit play the in between space has the arm twisting in an unnatural direction to get to the final frame. That's what I don't understand why it happens when it does. All I know is that I then have to play around in the in between to set an additional frame to prevent that unnatural twist.

Now that you have explained that you've done some custom work with the twist bones, I'm wondering if that addressed what I've seen.

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vasilnatalie In reply to ToadieOdie [2018-03-21 23:46:54 +0000 UTC]

You mean, like it twists in the wrong direction from what it should?  MMD takes the shortest path and collapses bones angles to plus-or-minus 180.  So if you have a twist of 0 degrees, and the next registration is 190 degrees, it will go from 0 to -170 degrees-- possibly the opposite of what you wanted.

It's possible to design models in MMD to prevent this, to lock off certain angles, but it's much more trouble than it's worth.

In Blender, not too much trouble to make it work like that if you want....  The way this rig works, where it figures out twist automatically, I don't really have to worry about that.

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ToadieOdie In reply to vasilnatalie [2018-03-22 04:17:33 +0000 UTC]

Okay, that's something I'll need to pay more attention to then.

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