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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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 ...
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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 ...
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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 ...
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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
81 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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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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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 ...
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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 ...
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2 votes
2 answers
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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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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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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 ...
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4 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 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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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 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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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?
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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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5 votes
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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 <...
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2 answers
115 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, ...
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1 vote
1 answer
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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 ...
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3 votes
1 answer
204 views

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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33 views

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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37 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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1 answer
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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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3 votes
1 answer
54 views

Non-identical behaviour of symmetric armature

I did foot controls armature on the left foot and symmetrized it for the right (btw I did the same manually without symmetrizing them and the problem appeared as well). As you can see , on the picture ...
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2 votes
2 answers
58 views

Change rig target control transform on 6 axis robot

In Blender I created a 6 axis robot with a control bone 'EndBone'. Bone.000 is the root bone on which all IK locks are set. On the other bones only one IK lock is cleared so movement around one axis ...
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1 vote
0 answers
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Limit movement of IK Controller vs Armature

Before I start, I've already seen How to limit movement of a IK-chain (armature) to one plane? which kinda looks like my problem but honestly, didn't understand much. I'm not very familiar with ...
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1 answer
39 views

Copy rotation keep offset for the bones doesn't work

I'm following this tutorial in making IK controls for the bones. https://www.youtube.com/watch?v=VVHKBSknFhA&list=PLyelx0TsmSpcgsINPt6fOh3yWjTjk2Nz9&index=7 The problem starts with 12:40 in ...
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45 views

how to keep the foot on the ground?

Is there a way to keep the foot joint not moving when the hip joint moving up? in blender?
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0 votes
1 answer
40 views

IK rotation control question

please see the picture below. there are 3 bones, bone A,bone B, and bone C.bone A is bone B's parent and bone A and bone B are connected. bone B has IK constraint and chain length is 2, target is bone ...
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39 views

inverse kinematics target goes crazy when attempting to move or adjust pole target

i was trying to move my target for my right arm IK to be able to animate the way the arm bends but when i try to move it, it seems to move the same way no matter what way i move it. the same thing ...
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1 vote
1 answer
37 views

My bone is not letting me modify IK limits

First of all I'm a very beginner in terms of blender at the point that I'm still doing a course in Udemy, now we are on the rigging part of the blender course and I got my first issue. We are trying ...
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0 votes
1 answer
56 views

Unable to IK rig this simple mech

I made this simple lego mech but when I try to IK rig it, the bones are always deformed and I can never adjust to a standard T pose. I tried following the royal skies tutorial but I could never get it ...
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How to IK rig a nested hard surface mechanism arm with attached vehicle?

the setup is to create an armature for a hard surface mechanism. It consists of a three step radial joint arm, and a lateral moving vehicle, moving on rails, that is controlled by that arm. The arm is ...
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1 answer
64 views

Why are my IK bones rotating my DEF bones like so?

Any ideas as to why the IK bones of my rig are twisting the arm like so? This is of course using rigify. This doesn't occur with FK bones posed to the same position, it just appears to be happening ...
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1 vote
1 answer
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Why do we use IK in the lower arm (fore arm) bone? How to select IK bone?

There is no issue to be solved or artefacts to be tweaked. The purpose of this question is just to better understand how IK works. I'm just curious what bone should we choose to have the IK constraint?...
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1 answer
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Problem with the IK Rigging/ The heel bone control is not connected at it should

Noob question: Im new to Blender and I watched videos where they put the IK behind the desire joint (articulation) but when they move it its still connected to the bone. But mine is separated for some ...
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Tail Armature acting weird, how do I fix it?

Followed this tutorial in rigging, https://www.youtube.com/watch?v=NjSUjiD-SvI&ab_channel=RicSanCustomToys whole body works well. Trex tail (when I select any of the three last armatures) does not ...
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1 vote
1 answer
50 views

How do I make an IK rig with separated bones?

Ill try to make this quick, I'm new to rigging so I bought a Model for a few bucks, model came as an .fbx file (Don't know if that makes a difference.) and I imported it to Blender. Got rid of some ...
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1 vote
0 answers
58 views

How to make shoulder bend properly?

I'm trying to make my shoulder bend properly and so far it looks like this: but when I try to move my hand it looks like this: I was wondering if there was a way I could limit the rotation around ...
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61 views

Rigid body with an armature on a complex model

I am trying to make a human character which would behave like a rigid body, ie. fall down to the ground and deform. I tried to follow this process which involves creating empties and parenting them to ...
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56 views

Two issues with pose mode - Can't apply pose as rest pose - IK Bone doesn't keep its connection to the controller

I am having a rather unusual issue with pose-mode in blender. Everytime I apply the pose as rest pose, the armature moves out of its position. Also - edit mode does not "accept" that new ...
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