Questions tagged [inverse-kinematics]

For questions about using IK in rigging. Inverse Kinematics is the opposite of the default Forward Kinematics. Instead of posing each bone in a chain from the base to the tip, IK solves the rotations of preceding bone(s) in the chain automatically based on the position of the IK-constrained bone.

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42 views

Switchable behaviour for knee bending in IK setup

Making a knee bend in a desired way in IK setup, is as simple as just changing that bend in edit mode. But what if I want the knee to be able to bend both ways, depending on situation. A switchable ...
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126 views

Should I include shoulders in arm IK?

When doing inverse kinematics on arms, is it a bad idea to have the shoulder bone be a part of the reverse chain? I find it very hard to constrain the rotation of shoulders when I include them. I ...
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1answer
392 views

Mirrored pose problem (IK goes crazy)

I have a problem when I try to mirror my run animation, the IK bones on the foot go completely out of control on the mirrored portion of my animation. The white keyframes are what I copied, and the ...
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74 views

Activating IK on Existing Armature

How do I activate IK (Inverse Kinematics) on this rig? I feel like it has the necessary bones. I appreciate your help. I would really like to enable crouching and gyrating of hips for dance animations ...
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0answers
555 views

About local space in action constraint

As you can see the picture below, if you change the rotation value by rotating the parent object (box), the rotation value of the child object (monkey) is retained. Child objects have their own local ...
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1answer
227 views

“child of” bone constraind with ik?

I'm animating a weapon for a game and ran into a little trouble that i don't know how to resolve. What i want to do is have the left hand supporting the gun like a person would, but that hand is ...
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1answer
41 views

IK Constraints Swinging Around Wildly

My IK's are out of control. I've set up enough simple IK's to know how to do it correctly and I have not idea what's going on here. I've tried redoing the IK's, recreating the bones completely, but ...
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0answers
160 views

Object doesn't get motion blur in several frames

I made a robot animation with IK rig. After rendering, as you can see on image 2 & 4, the robot didn't get motion blur at all but the furniture still get the motion blur. image 1 & 3 works ...
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1answer
373 views

How do I properly fit this tail with IK?

I have this tail rig that I'm using IK to animate with. I'm fairly new to rigging and IK, however, I've come this far: The problem is I want to have more control over the curve that the IK Target ...
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1answer
62 views

Incorrect IK behaviours

I am rigging a robot for some personal training, and I got into a very weird issue while rigging the legs. Here are my two foots, both are parented to the right bones, rigged to their respective ...
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3answers
869 views

Why does the elbow turn the wrong way?

I'm doing a character for a (very) low poly game. Since I already had a very basic IK rig laying around, I figured I'd adapt its armature to the recently created character. However, even after ...
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1answer
549 views

Rigify IK Not Working Properly

I've been working in a character during my free time, and I came to the point where I decided to Rig it using rigify. Everything went fine.. Until I tried bending the legs. Instead of bending like a ...
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1answer
24 views

pole targ it does not work as I would like

I'm working ik, and I try to put them a pole targ but this one does not work like I want. I'm using the pole targ to simulate the elbow but as you can see in the picture this nose bends like a piece ...
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1answer
394 views

Leg bones twisting backwards when moving leg up

The leg looks fine up to this part: However when I go further up it just twists and flips backward like so: I've scoured the internet and can't find a solution. The pole target offset is at 90 ...
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0answers
62 views

Inverse Kinematics Armature Rotation

When trying to learn how to animate characters today I wanted to accomplish learning Inverse Kinematics. Watched a couple tutorials on youtube, seems pretty straight forward. When I apply the target ...
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0answers
1k views

Creating a generic IK/FK snap script

I've tried deconstructing the Rigify addon to isolate the script part that handles IK/FK snapping, but so far I've had no luck. Rigify is a very nice tool, but I'd like to get the snap functionality ...
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1answer
166 views

Save ik bones after bake action for backup

Hi how do we save ik bones after baking action? After baking action, normally i’ll delete the ik bones so i can work on another animation in another action. Occasionally, i’ll need to enhance ...
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150 views

IK Pole Target directing to wrong direction

I have no idea why the pole doesn't follow the target, instead, the pole avoid it, i've tried to ROLL the bone to 0 degree. The result still the same.
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1answer
44 views
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1answer
542 views

How to change Chain Lenght in Inverse Kinematics?

I'm new in Blender. I have a character and I have some problem with his leg. Chain Lenght is 2 in left leg but it's 0 in right leg. I wanted to change it for 2, but my character fell apart. I watched ...
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0answers
418 views

Controlling robot servo arm (in real-time) via 3d model in blender

I am trying to create and control a robot arm (made of servos) via it's 3D model. I am big fan of Justin Dailey's work -- he was one of the first few people to accomplish this but his 7 year old ...
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1k views

How to setup IK Arms with upper and lower arm twist bones?

I have two bones for the upper arm, and two bones for the forearm. This is to assist in proper deformations when rotating the elbow and wrist, respectively. (ie: Using forward kinematics, if I want to ...
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0answers
43 views

Need help with bone constraints for creating joints

I have this rig that has an arm composed of 3 bones. I have an IK bone set up already to control the entire chain. I would like to use the Elbow.L bone to create a pole target that acts as a joint, ...
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0answers
61 views

Is my Inverse Kinematics bone working correctly?

Take a look at the bone selected. Now take a look at the selected bone. Shouldn't it be moving down as shown in the video tutorial I have been watching? https://youtu.be/jp_SqjB0468?t=14m22s
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1answer
722 views

IK restraint makes hand rotate weird in relation to gun, how to fix?

So i'm trying to make a gun animation in blender, so I set up an arm rig and modeled a gun, the only problem is, is that the arm's IK constraint messes up rotation, so the hand won't rotate with the ...
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1answer
85 views

IK rotation locking partially working

So I'm making a fairly rigid robot where only the top most bone on the leg can rotation on Z and the everything below that can only rotate on the X, I read some other posts about not using rotation ...
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1answer
322 views

IK on legs works only after you rotate a bone in the IK chain

I've been having this problem for a while. So I have a rig for a robot I am doing and the arm IKs are working as expected. But when I move the leg IKs the IK isn't working. The first half of the ...
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1answer
259 views

Belly deforming when moving hand!

For some reason moving the hand deforms the belly: However, there are no weights in that area, or at least none strong enough to cause the deformation I see: This is how it appears normally (at rest ...
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1answer
6k views

Keep rig feet flat on the ground (IK Rig)

So I have an IK rig setup; however, when I move the pelvis down to make the character squat the feet fall through the ground. e.g. How can I set it up so that when I move the pelvis down the feet ...
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1answer
187 views

Was Y-Axis IK Stretching removed in 2.79 RC2?

The stretching I'm referring to is the slider seen here in the IK Constraints settings for individual bones, not the "Stretch To" constraint: A while back (a little under a year ago now I think), I ...
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2answers
811 views

IK/Posing Nightmare

I'm fairly new to blender, and I've modeled plenty of low poly models.. but this is my first time attempting to rig anything. I've been following this great video tutorial step by step, but even ...
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0answers
306 views

Disable IK effect for a model's certain animations (and keep for the rest)

I have a question set in the title - I have a model where I use an IK structure to affect maniopulation with 2 handed weapon, it works the way to match the top hand of an imitated weapon in the ...
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1answer
866 views

IK rigged elbows have unexpected “laggy” or “jumpy” behaviour when animated

To keep this both as short and as informative as I can: The character I'm animating has bones in his arms set up like this: The lower arm has a regular IK constraint with a hand controller as a ...
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0answers
313 views

Inverse Kinematics odd behaviour

I have rigged an ant by parenting each bone of armature and then parenting every ant part to its corresponding bone. For animation purposes i have created empty objects in the ant's feet position and ...
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3answers
7k views

What is Inverse Kinematics?

Why do we need the Inverse Kinematic constraint in rigging? What is the benefit of it, what is a situation where I can use it and what does it do to the armature?
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1answer
843 views

Make Human to Blender with IK doesn't work as expected

I'm exporting the character from MakeHuman with the MHX format with a rig "CMU mb" or the "Game Engine". Then I imported the file to blender overriding the exported data and selecting the MHX as the ...
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2answers
2k views

Baking IK into FCurves

I have an object containing multiple models with several IK. One model has fcurves (euler rotation only) which gives motor to linked IK models. What I need is bake/convert all IK animations into ...
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2answers
2k views

How to export rigged character with ik or fk with .fbx format

I want to export my 3d modal with ik in .fbx format. I also try this with export my rigged character with .fbx format but it`s IK is not working after import it again. One more problem is ik bone ...
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1answer
2k views

Adding Armour to Rig

So I have a model of the Master Chief (Halo 5) that I downloaded from the internet, and I constructed a rig for him. The rig works fine But when I add the armour to the rig I get bad distortion (...
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0answers
102 views

Is it possible to get a list of sub-layouts from a self.layout and insert buttons on it?

I'd like to write an operator to set the correct pole angle for IKs, so adding a pole target won't move the rig. As I'd like to add a button next to the pole angle property field in the UI, found out ...
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0answers
545 views

I want to make this eye blink

I have modeled a little doggy and I wanna make her eyes blink. What I have created are two quarter spheres that set at the back of the eye behind the mesh to roll on the x-axis over the eyeball. I ...
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1answer
1k views

IK local rotation locking

I have an IK chain, and there are some axes that I don't want some bones to rotate around. So I go to the bone tab, scroll down to Inverse Kinematics, and lock the axes I don't want the bone to rotate ...
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1answer
387 views

Inverse Kinematics Documentation

I am currently writing a thesis and for the practical part I use blender to simulate something with the Blender IK Solver ( and iTaSC). Are there books etc about the implementation or the usage of the ...
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1answer
397 views

Inverse Kinematic Panel disabled from Bone tab

I cannot restrict the rotation of a Bone in Blender... I have done it on the previous project, but now it is disabled and I cannot figure out why.. Any ideas would be much appreciated, thanks.
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1answer
4k views

How do you lock the rotation of a bone in an IK chain?

How can you make an IK chain of bones where one of the bones does not rotate relative to it's parent bone but is still part of the IK chain? Specific example: I have this simple arm rig with IK that ...
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0answers
277 views

Get bone rotation from IK

Is it possible to get the xyz euler rotation of the bones in an armature that is controlled by the iTaSC IK solver with python? With the rotation I mean the difference e.g. between the start and end ...
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2answers
1k views

Adding a pole target causes bones to ignore their IK constraints

I currently have a robotic arm rig with the shoulder only being able to rotate along 1 axis, and the bicep only being allowed to rotate along a different axis. I am controlling these bones with an IK ...
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1answer
3k views

Disable stretch in IK bones

I'm using the nice rig from BornCG tutorial, and when I move the hand IK targets, the arms do not stretch, however, the legs do, and I can't figure out how to prevent them from doing that.
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1answer
402 views

IK show bones Degrees of Freedom

I rigged a human and now want to set the limits. I have a blue / red ring that visualizes the limits on the x and z axis but not on the y axis ( I just found out that I can deactivate them by ...
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2answers
403 views

How do I put a constraint on a bone affected by chain length?

I'm trying to figure out how to put a constraint on the shoulder bone as shown in the images below. What I'm looking for is a realistic motion where the shoulder moves upward ONLY when the arm bone ...