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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149 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

Problem in using Invers Kinematics

Please help me, how can i fix it ???
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1answer
535 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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1answer
137 views

Rigging problem with IK: why do the bones turn around?

it's my first time doing this and I have no idea what to do. I have seen a lot of youtube tutorials and at some point my results differ from the video even if I followed it exactly. As you can see in ...
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0answers
415 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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2answers
218 views

some vertices don't follow bone chain with Spline IK

I have made a complex ribbon-like structure (DNA strand), rigged it with bendy bones and made it follow an Archimedic spiral. In one strand, this worked perfectly (1st image), in the other some ...
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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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2answers
1k views

How to best animate a licking tongue?

I'm trying to animate a tongue that is licking an object. First I thought the tongue could be a soft body colliding with the object that it is licking, however, with that many parameters and options, ...
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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
659 views

Is my Inverse Kinematics not working correctly or is it working correctly?

Here is how it looks like when it is on the ground. Here is how it looks like when I move the bone up along the z axis. As you can notice the yellow bone moves to the right a little. How do I fix ...
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1answer
221 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
314 views

Spline IK bake and export problem

I’m having some trouble with SplineIK. I made a rope with bones, animated on a curve. I used spline IK and at the end I baked it before exporting. Everything works well in Blender before exporting, ...
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1answer
715 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
84 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
316 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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2answers
1k views

Disable IK then re-enable with different pose

So first of all I'm very-very beginner in Blender. Previously I have used Source Filmmaker. In SFM you had an option to apply IK rig to models and after that detach it. Now in Blender I have a model (...
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1answer
512 views

Stretching model with ik makes model bigger

How can I get rid of this when I move my bone? Because I would like it to only stretch, but not get bigger. I have stretch enabled in the ik panel. It's the thigh that has the stretch enabled on it ...
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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
258 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
194 views

Spline IK Bake Pose

How can the Blender User get the desired visual results for Bake below? Legend for image above. The letter A is next to a selected Armature which henceforth, for brevity, will be named [A]. The ...
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1answer
5k views

How to put all armature bones under 1 root bone

i have downloaded many arm rigs for my first person project in UE4. UE4 only allows for one root bone when importing. All of the arm rigs i have downloaded have many bones, rather than being children ...
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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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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
849 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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1answer
841 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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1answer
578 views

Can I prevent a specific bone from moving during Auto-IK posing?

Can I limit chain length during Auto-IK posing, or otherwise prevent the movement of specific bones? I'm familiar with the ability to limit chain length when setting IK bone constraints, but I don't ...
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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
536 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
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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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
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
929 views

IK Rig (Pole Target Issue)

Hello there so i have a mesh with IK set up for the arm however as soon as i add a pole target and go back to Position moving for the IK Arm It Screws up the Mesh this only occurs after adding the ...
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0answers
463 views

My IK rigging is backwards. Twisting the mesh and pointing the wrong direction

I am an amateur rigger at best. I do not have much of a grasp on the technical side of it, so this probably seems very stupid. My rig is putting a "knot" in my mesh and will only work if the IK is ...
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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
447 views

Blender 2.78a crashes when setting up IK system [closed]

Okay, this has wasted fifteen minutes of my entire life. I'm using Blender 2.78a with a Windows 32-bit OS. I was just following a character creation tutorial in Youtube and I made it till the end of ...
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2answers
401 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 ...
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0answers
95 views

Control the location of my IK bone

I've created an IK bone for my left arm of my armature. I wonder how I can control it's location to be beside the armature around the hand. As shown below, when I grab it all the way it goes far from ...
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1answer
1k views

How to switch to Inverse Kinematic for Make Human model in blender 2.78?

I exported a human in mhx2 format from MakeHuman and imported it to Blender 2.78a. What is necessary to install in blender in order to see the MHX Main panel and/or switch from FK to IK mode for ...
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1answer
3k views

IK not working properly

I did the exact same IK steps in two armatures and one of them SimpleArmature works great, but with the second one HumanArmature...
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1answer
196 views

Inverse Kinematics in BGE not working

I'm beginning in Blender and trying to create my first test game, but now I'm stuck in the creation of a aim system. Basically I created a tank model and associated an armature in it. Then, I created ...
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1answer
6k views

How can I seamlessly switch between IK/FK?

How can I switch between IK/FK without having bones changing their transformation? I have forearm bone with IK constrained. Now I want to disable IK and rotate forearm. The problem is whenever I ...
2
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1answer
257 views

Bending animation with rig?

I'm trying to make an android animation, but I am stuck at the rigging part. I want his arms and legs to be able to bend like plastic / rubber and use a rig. I've heard of lattice modifier, but that ...
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1answer
694 views

Character deforming with rigging and adding automatic weights

Im super new to blender so.. I have no idea what I'm doing wrong. I added some bones and IK and every time I add automatic weights his body gets all twisted and deformed and distorted. I tried a bunch ...