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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IK Bone act weird with control bone and does a 180° rotation

when I try to position my control bone from my armature the whole construct makes a 180° roation which I don't want. But the pose that my object should do looks like this and I can't get it this way. ...
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Problem with bones and Inverse kinematics when scaling

I have 6 armatures with IK and the last bone is not attached and used as target for the IK But when I hit S, expecting the bones would move towards the center, they all move in the same direction ...
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Can metarig support adding some extra bones to it?

I already saw this because it showed as a similar question. My use case is, I need to add bones between the limbs, like an extra bone between the shoulder and the bicep. I already have a custom rig, ...
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Rigify: If FK is Working, IK Stops working (and vice-versa)

I added a Meta-Human Armature to these arms, and as their normal bones everything works fine. When I Generate a Rigify Rig off the armature, there's this setting "IK-FK (hand.L)" (or hand.R) ...
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IK Limit Rotation not working when using pole

The IK Limit works fine when the not using a pole, but when you add a pole object the limit of the bone stops working. file: https://filebin.net/t4b8spnk9vuarpp9
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Why does my IK rigged mesh deform when the object is moved or rotated?

My mesh is rigged up and works perfectly in Pose Mode, but when I move or rotate the object in Object Mode the IK parts deform in some really hideous ways. It's as if the IK control bones aren't ...
1 vote
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IK Rig is broken on one half

A very common IK rig problem I always get is that on one half of the rig ( in terms of circular movement of the empty ) the rig completely glitches and behaves broken. It is flipping around and does ...
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1 answer
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inverse kinematics rigging on a quadruped

im learning to rig a quadruped and i want my IK to be able to bend 2 different ways. usually i could solve this by playing around with the pole angle but that seems to deform the mesh in an unwanted ...
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Bone local location axis is broken

For any bone in my rig, when I try changing its location along one of its local axis, only the value for that axis changes, just the way I want. But for this one IK bone, when I try moving it along ...
2 votes
2 answers
78 views

Problem with inverse kinematics and locking bone rotation

I have a simple bone system: I only need to lock the rotation of the "shoulder" bone along the Z axis (Y in bone local space), I lock the rotation in the "inverse kinematics" menu ...
2 votes
1 answer
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Inverse kinematics ignore rotation constraints

I applied rotation constraints to my bones so that they can only rotate around the X axis. Then I use the "inverse kinematics" modifier and it completely ignores the rotation constraints. ...
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IK elbows twist mesh Fk poles face bend the wrong way

Whenever I try pose my model using Ik_arms the arms bends the wrong way.And if I turn the pole controls on they bend the correct way but the mesh twists.How can I stop the mesh from twisting when ...
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Can't seem to rotate bones with IK on model?

I'm trying to curl my rigged hand models finger by rotating or changing the position of individual bones. Bone rotations or transformations are only deforming the model and the IK doesn't seem to be ...
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1 answer
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Can't Find IK in pose mode

Can't Find IK I am in pose mode I can use ⇧ Shift + I but that does not give what I want
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1 answer
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How do I copy bone properties (rotation constraints) with IK from one bone to another

I am trying to set up bone constraints on the fingers of my armature with IK. and all the information on how to copy constraints from one bone to another only apply to the constraints tab and not the ...
2 votes
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Rigify IK Pole Targets Disappearing During Animation

I've been having trouble with my rigify rig where I currently have an action where the IK pole targets disappear completely during the first few frames of the action. I've checked in the rigify ...
1 vote
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Rigify Deform Bones are Squashing

I recently started using Rigify and I encountered an issue where moving the IK bones on a custom generated rig causes the deform bones (and by extension the mesh) to squash unevenly ever so slightly. ...
1 vote
1 answer
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Blender 3.1 IK Bones Snap Out of Position When Moving Them

This seems more like a bug then anything else, but maybe I'm overlooking something. I have this coat that I've rigged that has worked just fine in the past, but now it's doing this weird thing where ...
1 vote
1 answer
56 views

Spline IK with control of both ends

Hiyo! I'm trying really hard to come up with a way to take a bone chain, for example of 5 bones, and use a Spline IK to match this bone chain to a curve WHILE controlling the exact position of both ...
1 vote
1 answer
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Problem when trying to shrink part of model (with armature) - IK

I have problem with armature and bones and due to my lack of knowledge about all this stuff I'll try to explain as good as possible. This is simple model I have a problem with. Course, all work is ...
1 vote
1 answer
56 views

Inverse Kinematics: Bones doesn't bend towards the pole target

I am doing my first rigging in Blender. I am following this and this youtube videos. My armature looks like this from the front view: When I move the inverse kinematics "target bone" up in ...
1 vote
1 answer
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Trying to pose model but the pose snaps back to original immediately

I'm having a frustrating time moving my IK arms. I've tried unchecking "Connected" on bone group but then it warps the movement. This movement shown here is what I want but I somehow seem ...
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Moving an IK bone doesn't affect its location

I set up an IK for a hand and I want to animate that hands' position. However, if I move the bone, its location parameter doesn't change, and when I insert a location keyframe, its always at 0.0, 0.0, ...
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How to force bones to follow tracking points?

I'm trying to animate a 2D figure. My figure is a flat subdivided mesh with an image on it. There's an armature representing the figure, and I have a set of tracking points linked to empties in the ...
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Exporting IK animation to .gltf format breaks the model

I have rigged and animated a bird using IK and drivers. When I try to export it to gltf 2.0 format, IK bones don't seem to be used in the exported animation and there is a place where the skinning is ...
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Keying multiple emptys which are IK targets results in location reverting to 0 when timeline is moved

I've run into a very strange issue with my otherwise normal skeleton and IK rig. When I key my IK emptys, every IK empty snaps to the most recent location keyed when I pan through the timeline. This ...
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2 answers
86 views

IK issue when hand is near face

I'm not entirely sure if I have a clear title but I provided some images to show what my current problem is. Here's how the pose looks like. As you can see, the elbow is too high. I tried to move ...
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Knee going a completely different direction from the pole

As the tittle says, i'm still trying to figure out rigging, but no matter what i try, when i think i finished working with the legs, the knee bends unnaturally when i'm imitating a crouching motion ...
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1 vote
1 answer
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Pole targets on ik rig dont guide the joint properly

I have added 2 pole targets on my rig for the 2 arms and they work as intended, they pull the elbows to the back (where the poles are located). However, i have added 2 similar ones for the knees but ...
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2 votes
1 answer
120 views

How to Rig a Character's Spine if the Face is Part of the Body?

So I am watching a course on rigging and most characters are human like with a normal spine and face is separated with their neck. However, my character has it's face on the body. Here's an example ...
1 vote
1 answer
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Scale IK Bones in Armature without Affecting other bones?

So I want to make my IK bones larger because they're small and hard to click. I tried in both edit and pose mode yet noticed that affects my entire rig. Is there a simple way to scale the IK bones ...
2 votes
2 answers
55 views

Rigging mesh bends rigidly with Inverse Kinematics

I'm a beginner, trying to rig tentacles on my creature. I have added an inverse kinematic constraint to the end of the tentacle and for some reason when I move it looks very rigid instead of smooth. I ...
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1 answer
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specific bone wont move but other will

I'm trying to get one bone to move outward (left arm bone) but it won't move. the other one moves just fine and they (as far as I can see) have the same constraints. below is the blend file along with ...
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1 vote
2 answers
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IK leg flips Upwards

I'm currently advancing my rig with IK, and ran into the problem of the leg flipping full 180 when positioning it upwards. The First picture is showing how it wrongly flips. I of course want the leg ...
3 votes
1 answer
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My inverse kinematics are bugging out hard with crazy rotation issues

I've tried recalculating bone roll before applying IK. I've tried offsetting the knee join so its not perfectly 180 from the upper leg. I've tried deleting excess bones use for cloth on other rigged ...
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Inverse Kinematic Armature Collada Export Direction Problem

I made a simple animation with inverse kinematic. An object flexes x+ direction which I wanted (because of IK armature I used) when animation runs. But when I export it flexes x- direction I could not ...
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1 vote
1 answer
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Arms fidgeting during simple walking animation

I'm trying to learn blender and this is pretty much my first couple weeks in. I'm trying to figure out why the arms would fidget like that I've tried messing around with graph editor but I don't get ...
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1 answer
34 views

Stopping a body part from moving

I am working on an animation of a cyclist on a bike, and I encounter a problematic situation while trying to make the rotational movement of the pedal: when I am moving the crank, the chain ring of ...
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1 vote
1 answer
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leg IK weights not deforming properly

hey sorry for the surplus of images. i am confused on why one model (the issue model) leg wont deform like the leg on the working model does even though the weights are very similar. here is the ...
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215 views

How to stop IK rotation bending Bones or Mesh

When I enabled the rotation under IK, the bone with IK constraint was bent 90 degrees. I rotated the empty to fix the bend. Why did it automatically do this?
2 votes
0 answers
29 views

why doesn't the rig follow the sphere?

Rig beginner here: I have a simple inverse kinematic rig here: The sphere is the target of the IK of Bone.00 I limited the y/z rotation like this for both bones: I do not understand, why this is the ...
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4 votes
1 answer
186 views

Blender IK constraint not working correctly

I made a rigged character but when I wanted to add IK constraint to it, the rotation of bones became confusing : I searched youtube for the answer but the only thing that I found is changing the <...
0 votes
2 answers
216 views

How can I limit the rotation of a bone using euler angles in ik

The problem is I'm trying to limit the y rotation of the top bone in an ik chain to 0. By the way, I'm not using a pole target. When I posed ik handler, then applied the visual transform to the bone, ...
1 vote
1 answer
25 views

Bone constraints for tiered mechanical movement - Moving A a certain amount before B moves

Hello Blender enthousiasts! I am trying to create a tiered mechanical movement, similar to how a forklift might work. Aka the Fork can move up on the Z axis until it reaches the top of the Raising ...
3 votes
1 answer
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I don't see the inverse kinematics in Blender 3.0?

Could someone tell me how I add an inverse kinematics object constraint in Blender 3.0? I selected a bone in Pose Mode, then in Properties > Object Constraint Properties > Add Object Constraint, ...
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Cant not Limit IK Bone Rotation of bone

I Need help with the rig The image is when i using the boneIK to control finger ,The thumb2 work alright,but the thumb1 rotation out of where it should . Does IK limit rotation just work when theres ...
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Why is my armature causing the knees to lock? [duplicate]

I made a full armature for my character and when I tested the movements, I noticed that the knees kinda move towards each other instead of moving straight forward.I'm not quite sure how to fix it so ...
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Inverse Kinematics (IK) rigging does not work

I set up this inverse kinematics (IK) in the left foot of my char rig by following a YouTube tutorial, but the rig is not working as it is working in the video. The bone is bending in a different ...
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104 views

how to disable bone movement while keeping all transforms

(ignore the crazy proportions in this scene I'm just experimenting) I'm trying to make the hand IK bone (square) stay exactly where it is between frames 705-726. I have a few constraints applied to it ...
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How do I create blendable animations for Unity that use IKs?

So, I have two animations I have made. An idle animation and a swing animation: I have tried to blend these in unity as a test for when I add in running, or sliding, etc. But I ended up with this: ...

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