single joint chain IK/FK Switch with stretchy limb

[wildfire0310]

I know when working in maya, this is short how i been shown.

Say for an Arm

create distance locators to give the distance of each bone that makes up said Arm for the FK.
create an attribute that has the orginal length of the IK arm
then create a multiplyDivde node to divide the orginal length of the IK arm by the FK length sum. That number is then inputed as the scale of each bone
Then I go and make the minium value of the scale for each bone to be 1 so the scale can never go less then one.


I think I maybe leaving off a few steps, but hopefully that helps some. BTW I am still kinda new so it is still hard for me to explain.

[solun]

thx wildfire,


but i can't follow all of that , is itthat for single joint chain IK/FK.


Anyway, thx again




solun

[wildfire0310]

I build my IK/FK with three parts:

Ik joints, Fk joints, and binding joints

right now my rig is flipping out, cause my Ik handle is adding rotate values to my Ik joints, and so when I switch from Ik to Fk it not lining up anymore.

so what was working is now not... blah.

Once I figure it out, I'll post back.

Sorry

[aaronholly]

With a single joint chain rig (arm or leg) you should not need to match scaling. Your effector will be locked to the end of the joint no matter what.

When I build a single-chain limb I have been able to scale the joints and only manage it switch between the fk/ik states. The scaling comes along "for free" in a sense.

Can you explain your setup and the problem you are having?

[solun]

With a single joint chain rig (arm or leg) you should not need to match scaling. Your effector will be locked to the end of the joint no matter what.

When I build a single-chain limb I have been able to scale the joints and only manage it switch between the fk/ik states. The scaling comes along "for free" in a sense.

Can you explain your setup and the problem you are having?

I snap the Ikhandle for switching IK and matching rotation value for switching FK , ik/fk can be switched smoothly, but i have no idea with the stretchy scale. I use

if IK length > sum of joints
then scale of joints = IK length / sum of joints

for the IK joint scale, it works, but how can I scale joints individly after switch FK and matching the scale after swtich IK.

thx alot

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