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First you will need a target bone for the Ik - for example a copy of the foot bone. Make sure this bone is not parented to anything (except when you have a root/master bone - then parent it to root/master)
Now in pose mode add an IK constraint to the shin bone and setup it like in the picture. You can do this fast by selecting the target_bone first (copy of ...
answered Dec 25 '14 at 14:15
Jaroslav Jerryno Novotny
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15
I think you could test at least 3 solutions, the classic rigging with bendy bones playing with Easing In and Out, the Stretch To constraint solution, will allow you to stretch the arm, and the Spline IK constraint solution, which is a bit more complicated but will deform more nicely.
1) CLASSIC RIGGING
Create a chain of bones: upper arm, lower arm, hand, ...
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Shapekeys
Would consider using shapekeys for the handles. With two shapekeys fully flexed and fully straight.
For example sake have made the rest of the mesh into shapekeys, however could use hooks or constraints to move cylinders, but what matters here is getting the handle flex.
To open close handle is now only a matter of adjusting flex shape value.
...
8
One solution is to make the stretch value in
BONE > INVERSE KINEMETICS > STRETCH to more than zero and not close to 1
I set it to 0.1 As seen in Pitchipoy rig set up
It has to be done for each bone in the chain
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What is Inverse Kinematics?
There are two main ways to pose a chain of bones:
"Forward Kinematics" (FK) is the normal way of manipulating a bone chain, based on parent-child relationships. You need to rotate each bone individually.
Inverse Kinematics (IK) is another way, where the movement of the chain is determined by a "target" bone (and optionally a "...
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It should work this way:
Create 2 armatures, A and B, and create a bezier curve with 3 vertices that follows the armature B’s arc.
Parent both bones a2 and a3 to bone a1 in Keep Offset mode.
In Pose mode, give a2 a Limit Location constraint / Local Space mode, with only the Y axis unchecked, so that this bone can only move on its Y axis.
Hook each vertex of ...
5
You need to use the IK Limit rotation found as shown below:
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Like this?
Yeah, that's a tricky one and it needs either a cheat or the not so new but usually overlooked iTaSC solver.
So, in the settings of your armature, enable iTaSC:
I made the blue part the boss and the green will follow. If I'm not mistaken, this special solver doesn't like unparented targets, so I made a main bone. The hierarchy is as follows (u =...
4
Original Article: Overview of Inverse Kinematics
You’ve probably heard of Inverse Kinematics. IK is a popular tool in Blender and computer graphics, but if this is the first time you’ve tried to create or use an Inverse Kinematics system then you might want more details. I’m going to explain what IK is, define the vocabulary, and review the uses.
What is ...
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That method works extremely well for all sorts of short bendy things, tails, tentacles, tongues, you name it. Only having 3 controllers for all of it makes animating a snap, too.
I just want to add, that a couple of modifiers in combination with the mesh are useful:
First, a Subdivision Surface Modifier, to make sure there is enough geometry there to be ...
3
Under the Rig Main Properties you have the IK/FK slider. Below that you have two options to snap the pose to either the IK or FK position.
p.s. I notice you are using the MetaRig to animate. Generally the MetaRig is used to generate a new rig with all the bells and whistles like IK/FK organised for you.
The 'generation' also creates the Rig Layers which ...
3
So by messing around I managed to find my own mistake, and hopefully this answer will help others avoid it.
As is the standard with most IK setups, I have 2 bones in the place of the Hand:
The actual deforming Hand bone, which is child of the Lower Arm bone
A helper "Controller" bone, which occupies the same space as the Hand bone, but is not a child of ...
3
I ended up using bendy bones – which are essentially a number of bones aligned to a spline, whose control points can be animated.
I found this youtube tutorial very helpful. using drivers to map the position of an object to a parameter of the spline is a neat trick.
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Solution: The gun and body armatures were separate, so I deleted the original gun armature and created one inside the body armature. Using IK that targets the last bone of the gun and uses the gun mesh as a pole. I could achieve an almost, if not completely perfect result.
Took me way too long to find it myself, so I'll leave it here for others, who suffer ...
2
Consider using a Spline IK on the armature.
In the animation above the influence of the constraint is keyframed.
Animate the curve as part of your animation.
Animate influence of Spline IK constraint as part of your animation.
Your bones will flow fluidly under the control of the curve.
Save poses. Many options.
Attach this in pose mode.
Bones in yellow ...
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In the bone IK constraint, try to disable weight influence for position, leave it only for rotation. You can restore influence to 1.0 as is probably needed for rotation.
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There are two ways that you can do this. You can either select the bone and add in rotation constraints or you can do it a really easy way. Simply select the bone you want not to rotate while in pose mode. Then press N to bring up the additional menu on the right side of the view port. The top tab that says transform is what you want to look at. Where ...
2
The legs need a bend in their default position. Select the armature, go into Edit Mode, and push the knees forward a tad. Here's what it should look like after that.
Also, consider reducing the leg IK chain length to 2. This will make the bending more predictable.
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The issue you have is parenting. You would have the hand bone as a child of the lower arm bone, this parenting defines the position of the hand, preventing the location constraint from moving it. As the bone parenting doesn't effect the rotation, your rotation constraint can do it's thing.
You have the right idea with using IK, the IK constraint will set ...
2
You've got many dependency cycle into your Rig, as you can see on console :
This is because you add a limit distance between your IK target and bone that have the IK constraint.
Delete your limit distance constraint, and everything will be find.
(Why exactly you added this constraint ?)
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You'll need to create a symmetrical armature first, rig it properly, and then assign proper weights to the mesh. What you get is partially logical. Think about it: The vertices of the right hand side of your crossbow are parented to the left bone. That bone, when it deforms, rotates counter-clockwise. Since the vertices have no idea yet that they should ...
2
You need to check "Override Exported Data" when importing the mhx2 file, and add a rig:
The rig controls are under the "MHX2 Runtime" tab (Layers and "FK/IK Switch") in the tools panel. The MakeWalk addon is not needed for this, only the MakeHuman import-runtime.
2
This is a scaling artifact that happens when Y-stretch is enabled. The bone scales get applied additively down the chain, because the bones are parented to each other, resulting in an odd shape.
What you need to do is: Copy the SplineIK bone chain, delete the SplineIK constraint in this new chain and unparent all the bones from each other. Than add copy ...
2
I found the problem, thanks to this answer. It turns out the vertices in question were also controlled by a bone at the very end of the chain.
What I did:
select the mesh, go into edit mode;
select one vertex inside the problematic part of the mesh and bring up the properties bar by pressing N;
under Vertex Weights, check the names of the bones controlling ...
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The Problem here is your Control bone for those IK is parented with the IK bone. So simply clear parent it will slove the problem.
-Select FrontFoot.L bone
-Press Alt + P
-Choose Clear Parent
The IK work correctly now.
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You need to create a controller bone that will control your IK:
Create a bone from the last one and deparent it with alt P.
Deactivate the Deform option of this bone so that this bone won't deform the mesh of your object when you'll parent it to the armature.
Choose this new bone as the Target of your IK bone.
Move the controller, the bones will follow.
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In pose mode you can select all bones you need and bake the animation into a new action, removing the constraints. The movements will be the same as if the constraints were still acting.
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You could deactivate the IK when needed: Click on the eye icon to deactivate, put your cursor on it and press i to insert a keyframe. If you want to reactivate, same thing, click on the eye to reactivate and press i.
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If you want the IK-Handle to stay in the same position as the pencil, simply use a Bone Constraint on the IK-Handle. Select the IK-Handle in Pose Mode and add the Copy Location Constraint from the Bone Constraint Menu (not the regular Object Constraints, see screenshot). Choose the pencil as a target, the bone will then follow the pencils origin.
If that ...
2
In the ideal case, you should have the pole value set to zero, reaching the desired behaviour by tweaking the bones roll in edit mode, and it's a habit to choose positive X axis as main bone rotation. The more your rotations happen on a single axis, the easier is to edit the animation with the graph editor, and this is the reason why - 90 and 90 degrees are ...
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