There are multiple
different types of IK handles them being Single Chain (SC), Rotate plane (RP)
handle and Spline handle. For this project I will be using at least 2 of the
different handles them being the SC and RP handles. But I will also be looking
into spline handles to see where I can fit them into my project or were I could
fix them into a future project.
Single chain (SC) and
Rotate plan (RP) are used to animate motion into limbs and other objects. Single chain IKs control the middle of joints
when rotating the IK handle. Rotate plane IKs are used to rotate the joint
chain/system they are connected too and can work with the Single chain to make
a limb move realistically. For Example I will be using a Rotate plane handle
from the hip to the ankle then have Single chain handles from the ankle to the
ball of the foot and from the ball of the foot to the toes. Having this IK
handles where I put them make the rig have similar muscles to a real biped or
quadruped.
For my biped I will
be using a combination of Single chain and Rotate plane IKs to animate the
legs. Using this combination in the past has worked really well when it came to
animating it later on it gave me just the right amount of freedom to be able to
do walk cycles, jumps and other actions using the legs. But also when added
with set driven keys it made the animations feel more real and more
professional.
For my shark I didn’t
think about adding any IK handles to this rig because I didn’t fully know it
would be affective enough for it to be worth adding them. It seemed at the time
that moving the rig with controllers gave the model decent movement even though
it was a bit time consuming.
For my quadrupeds each
leg will have a similar to the biped but slightly different because of the way
dogs legs are the basics of it will be the same just the pivot on the Rotate
plane will be slightly. A dogs leg in this case is slightly curved which is why
the IK handles might be a little bit different but they should work the same
way they would in a biped. Adding set driven keys later on will help more with
the animation side of this but I will talk about that later.
When looking up about
the Spline IK handle I found out that they are somewhat similar to the rotate
plane IK in the way you attach them to a rig/ joint system but they are used
more to create the motion of curvy or twisty shapes. Finding this out after
finishing doing my shark model was a bit disappointing because I could of used
that to create a much better rig and make a more realistic movement. I also
could have used the spline in the dog’s tail so that when it wagged it did more
of a wavy motion. Both the human and the dog could have slightly been improved
by adding a spline to the spine and by adding a curve to the spine. Because
when doing a joint chain/system the joints work better when they are in a
straight line than to when they are dotted around everywhere.
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