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View Full Version : Ik/Fk switching to grab and let go


jdonnelly
02-09-2005, 11:44 PM
I watched some tutorials on this, but it doesn't seem to work quite right. I'm also using NURBS curves as controls for the IK handles so I just grab the curve instead of the IK handles to move the arm,etc.
I cannot figure out how to make Ik/Fk switching work for me! I tried using "enable IK/FK" and setting keys for them under the IK/FK Keys sub-menu... but whenever I try anything, the arm "pops" and is never in the right place (even if I hadn't even moved it yet, just tested turning Ik on/off)
Should I just give up computer animation now and be a Doggy Day Care specialist? :)

seven6ty
02-10-2005, 12:20 AM
I'm not really sure exactly what your question is, but to turn IK on/off you have to use the "IK Blend" attribute on the IK handle itself.

jdonnelly
02-10-2005, 12:39 AM
Basically, what I'm trying to get at is how do I manage to have a character place hands on something and not move from that spot while the body could shift around and then later be able to take the hand off of that spot and move freely again?
I'm using curves as my control object to move the arms and am not animating by grabbing the IK Handles themselves.

seven6ty
02-10-2005, 12:55 AM
Um... Well yeah, what you are talking about is exactly what an IK solver does. Keeps the end at whatever point you like and then solves for the rotations of the rest of the joints. And yeah, even if you are using a nurbs curve, you're going to need to set up an attribute to control/drive the IK Blend attribute on the IK handle, so that you can turn it on and off.

Arcon
02-11-2005, 09:03 PM
Basically, what I'm trying to get at is how do I manage to have a character place hands on something and not move from that spot while the body could shift around and then later be able to take the hand off of that spot and move freely again?


are u using a broken chain rig at the wrist...? also how's your IK/FK arm setup? best to make a master arm skeleton driven by seperate IK and FK skeletons (should be covered in the archives), and create a custom attribute that blends between those to avoid popping.

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02-11-2006, 10:00 PM
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