I was playing with golf swing mocap data, and I followed this tutorial, https://www.youtube.com/watch?v=Eha1cLjALcE but it absolutely does not work for a golf motion. The IK is broken at the wrists with reach targeting. I got the grip to be more or less good enough, but there is no possible way to do a golf swing because the wrists are impossible to put in the right place once you use a reach target. 

It would work perfectly if you could attach each hand to the same object. Does anyone know of a work around? I tried daisy chaining dummies, but I get the error message that something cannot attach to itself.




Close enough for now. A good test would be interlocking fingers.



Off balance, but wrists are normal. 




If addressing ball, then it's broken. No way around it. I also tried gripping in this setup, but then it just breaks elsewhere. It's limitation of the reach target. The IK is pretty good for hip and body rotation. The wrists are just FUBAR.

The iClone house tutorials always depict the program in the best light. The situations where iClone struggles are never chosen. :-) 

I'm sure it is all possible in blender, but I think gripping objects is a big part of what makes humans, human. Golf is the hardest motion you can throw at it I think. It's very easy to tell in sports who has a clue and who doesn't instinctively from small details. This is where 3D is hard. Too much uncanniness. 

I played around with a real club. The hands are very malleable. They can contort in weird ways. 

The reach target IK chain stops at the wrist (the beginning of the hand bone). So there where you are locked. Attaching the dummies to the grip gets you half-way there, but it will take some careful animation of the hands to get them realistic in their motion.

As sw00000p has noted, our hands are extremely pliable. They are also responding to "wiggle" in the real world that can distort their shape. That can't happen in iClone. There is no physics acting on the avatar bodies.

I have always considered it a bug that the wrists are locked. I think the IK chain need to end at the first bone of the middle finger or thumb.

Thanks for the explanation. I am still working on a solution. The animation looks perfectly fine when the club is in one hand attached, it just sucks that reach target makes it behave so weirdly.

I will share in this thread if I find a solution. 

 

Well. I have to take that back. The wrists are rotating. Guess it's been a while since I used the reach targets. :blush:

EDIT

Make sure you have rotation enabled for the targets, and pose the hands really carefully. The pictures you showed are holding the club very straight, but it should be angled across the fingers. I would call your picture a 90 degree grip, and it needs to be 45 degrees. Also set the pivot of the club at the wrist of the back hand.

The photos are with reach target. It's normal not using reach target before lowering and rotating the club, but then I can't attach two hands. The wrist rotates but it's very strange. The position IK wants it to be in is not humanly possible unless your wrist is broken.

Progress, maybe the solution: I'm fairly certain the rig is just wrong for the thumb in the way it moves. This is quite a bit of work and will make this a non-standard character. I challenge RL to make a natural looking golf swing. This will solve a lot of issues. 

I can't find a way to edit pivot point from high in wrist lower when using a reach target. It would work too as well if there is some way to change the pivot point of the wrist. As mentioned earlier, the club is connecting to the wrist, which makes no sense. 

I am going to put this one off for a future free day. I got it to grip ok finally, not sure how, but the IK is wonky.

Tedious editing as you must twist the finger quit a bit, but it looks good enough for the medium. 

The arms were penetrating the body on my model with a perfect setup, and I plugged it in with the stock CC Christian. The problem still exists. I think some of these problems arise from the people doing it not understanding anatomy. Christian has cartoonish proportions and a very bad case of lordosis.  

The golf swing puts arms squished against the body, but I don't think it goes through...

I also think that the CG is thrown off with the reach target. Christian is going to fall over himself after he hits the shot.

@Nadiak. That is looking pretty good. :)

What I meant by changing the pivot was for the club, not the character. The fulcrum of the club (lever) is at the back hand, so that is wher you would want the rotation to happen. Since your using a reach target, the club determines the rotation. The reach target makes it the end of the IK chain.

Select the club, and find the "Edit Pivot" in the modify panel. It's a toggle button. When pressed, you can then use the gizmo to move or rotate the pivot. Move it to the position of the rear hand, then un-toggle the button. Now when you rotate the club, it rotates at the point of the rear hand.

When i do things sometimes I use the little "ball" 3d primitives say if you want someone to grab something complicated I attach those balls and then make the hands etc grab there.   Then I can move the balls err sphere i guess one should say .. nevermind i wont go back and correct it my terminology works for me.   I usually put 1 ball for each hand where i want the hands to go and then put the hands there. 

Sometimes changing the pivot or the main object has unintended side effects err although the golf club is pretty simple as an object.

    
(i swear i am sober and that was serious but now that i read it LOL oh well anyhow yeah goes back to my set building) 

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