Awesome! Looking forward to this! Would love to see some extra breast sliders to imitate better jiggle physics in the future

There are a couple of approaches to this, you can invert the knee joint, add an extra knee correction joint,  or do something like:

	AppExprLinear . {
        .InputObjectNameArray [ "Person" + :person + "Anim:Model01:Sknee_L_joint" ];
      ...
        .OutputObjectName "Person" + :person + "Anim:Model01:knee_L_pe_transY";
        .OutputAttr @ BlendControl .Weight;
    };	

But the morphs should be used as well, in fact everyone is using them, including Daz.

Later edit.

There is something that must be added to the knee bone and that is missing apparently from the default inputs. I had this problem with my custom bodies which allowed only a slight change in translation, but this also affects the stock bodies at a high rotation angle.

Code for the fix:

:Person" + :person + "Anim:Model01:knee_L_joint.SNode?.PreferredAngle (0.0f, 0.0f, 90.0f);
:Person" + :person + "Anim:Model01:knee_R_joint.SNode?.PreferredAngle (0.0f, 0.0f, 90.0f);

@hfg2

I don't get what those lines do tbh especially after full two months away from modding now. Is only a slight change (translation?) allowed with your custom body? And those lines prevents from it? In my testing body translation is unlimited though... anyway those information are appreciated, for me in the future, or for someone who's working for their custom bodies.

Under Limbs section there is a Knee L and a Knee R, those in fact manipulates the values under 

Anim:Model01:knee_L_pe_transY

This is obviously found in anim01.bs file.

You can drive those sliders manually, but if you want you can auto-drive those sliders using AppExprLinear. I thought this is what you tried to do in your "fixings".

If you drive those sliders to the max the leg will jump out of the place like crazy, to correct that and allow for more extreme sliders you need to fix the PreferredAngle. This is omitted in the anim01.bs file because it doesnt cause problems for original joints values.

On 12/28/2023 at 4:31 AM, hfg2 said:

Under Limbs section there is a Knee L and a Knee R, those in fact manipulates the values under 

Anim:Model01:knee_L_pe_transY

This is obviously found in anim01.bs file.

You can drive those sliders manually, but if you want you can auto-drive those sliders using AppExprLinear. I thought this is what you tried to do in your "fixings".

If you drive those sliders to the max the leg will jump out of the place like crazy, to correct that and allow for more extreme sliders you need to fix the PreferredAngle. This is omitted in the anim01.bs file because it doesnt cause problems for original joints values.

So PreferredAngle enable reverse joint or something? I'm not sure this is relevant tho I wish there's some "limiter" for AppExprLinear to prevent it from working all the way in a bone rotation but to enable only work in between specific angles.

Speaking about AppExprrLinear, yeah I used it in the demo clip and the "Anim:Model01:knee_L_pe_transY" must be (iirc) from what I made mimic animation to be used in my ExprLinear code because it was impossible to use same anime in both pe slider and ExprLinear atst. Thanks to Raistin I could make a brand new blend group, and probably would be possible to make new connection group itself. And that may be possible to add as many animation as you want from Addons folder, not replacing anim01 file. But I'm taking a brake before working on it.

17 hours ago, HDiddy said:

@Driver the ones in the game...well they suck. LOL, I used the ones @Sammrchssn created in Realistic Female in XBody and IMO those are perfect.

Yeah Samm's correction morphs just work nicely. My version uses bone translation so that it doesn't cause major clipping issue with pants or skirt, that is the major difference. But adding some auto morphs to shape knee caps more decent when the knee are bent would be nice.

When you make an IK chain, the bones must have some kind of bending, so the IK solver knows how the bones are supposed to bend, in which direction. This is usually obtained from the bones themselves, as long as the bones are not in a straight line, there will be some kind of bending (like in the knee area). However, if you translate the bones, then the original bending will be messed up and as a result the bones will flip.

This is where PreferredAngle is useful, it will tell the bones how they should bend.

RK had some info about IK here: 

This looks just awesome. Can you by any chance do something about this instance:

And make Latona body a bit more "flexible"? If you put feet and knees behind some point towarda the head and upper body this happens.  This would be really great.

13 hours ago, The Other One said:

This looks just awesome. Can you by any chance do something about this instance:

And make Latona body a bit more "flexible"? If you put feet and knees behind some point towarda the head and upper body this happens.  This would be really great.

I'm sure female body do has such problem more or less, but I'd say that in your image is problem of the cloth itself. To get better result in those poses you need to have dual approaches one from addon clothes and the other from the body.