How can I record animations in the studio? For example, in games, H scenes have animations, how to do this? In 1st chapter creators used some kind of extraneous program as far as I know
There are a few ways, but a lot of the better ones rely on plugins that haven't been ported yet (that I know of). HS1 and Koikatsu both had advanced IK options that would allow you to map character bones (basically parts of the body) to motion controllers (found under add > items > gimmick). I don't think either AIG or HS2 have this yet. It's hard to explain, but this video for HS1 has a pretty good rundown that helped me understand it:
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You can use motion objects (called gimmicks) and parent whole characters (click the thing you want to be the parent first, then click the thing you want to inherit movement, and click the "parent" button on the workspace window in studio) to them, which will cause their entire body to move with the gimmick, but without the advanced plugins you can't target individual bones as far as I know. You also have to hide the gimmick somewhere in the scene, so that there isn't a weird mechanical piston in your shot.
There are the preset animations in studio, of course, but those tend to not mesh very well, and also get fucked up once IK/FK is applied. HS2 doesn't have many user created scenes yet, but the ones I've seen with animation have come from clever combinations of preset animations and IK/FK.
Finally, you can cause a character to move with a route animation. On the workspace window in studio press the button that says "Route", and then add points to it. You can then parent a character to it, and they'll move along the route in terms of points you define (click on the route in the workspace window, then click the "anim" tab in studio for editing options). These are tricky, and I never use them, but I feel like you could cleverly use them to animate a scene.
These are just what I know about, so if anyone else knows more about animation with the current studio software I'd love to hear it too.