Re: [Algorithms] Kinematic Collision

[pontus b. <her...@ho...>]

This thread
is really interesting (or was up to a point). Before it dies down I'd like to
ask for some recommended reading. This is something that I find a true pain
whenever I start a new project because there's animation and there's physics
and they both want different things and are VERY rigid in how you can use them.



In my experience which mostly dealt with fighting games, the attack animations
will include a player translation which needs to be exact in order for it to
look good, i.e. I must use translation on individual frames and NOT apply a
force which delays and smudges movement.



The animation being translated first poses the problem of not letting the player’s
world position go out of sync with its pelvis (root joint) so various spatially
based algorithms don't get thrown off. This can of course be solved by tricking
around with spatial delta for each animation key frame and applying the correct
translation/rotation on a per frame basis. After this step I end up taking the
transformation from the pelvis bone on that particular key frame and instead apply
it directly to the entity world position.



When I've done this it feels like I've effectively contradicted the way I'm
allowed to work with physics simulated objects though. Unless the physics
integration method is an implicit one, as far as I understand it, I'm not
supposed to move the object using translation, only by force or suffer the hell
that is unstable physics...



So if that's the case, and do point out if I'm wrong, what does this character
controller that I keep hearing about do differently from this that make physics
and animation, not only speak the same language but also like each other?



Regards

Pontus Birgersson


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