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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50 views

Automatic Forearm twist?

I'm trying to setup a rig that allows IK/FK (via influence property), where the forearm twist joint automatically alleviates part of the twist of the hand. Not necessarily as part of the IK - just ...
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1answer
173 views

Rig with sticky feet and hands, how do I create arm swings? (ex: playing tennis)

I've been using this tutorial ( https://www.youtube.com/watch?v=Q9f-WVs3ghI ) to create sticky feet and hands for my character rig. Sticky feet I've noticed is pretty standard for character rigging ...
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1answer
286 views

Inverse Kinematics constraint with pole target

Salutations, I am currently trying to make a rig for a project involving 2D planes to create some kind of equivalent of DragonBones in Blender (I'm working on Linux and DragonBones isn't available ...
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1answer
22 views

How to use root motion with inverse kinematics?

I have created a simple attack animation using inverse kinematics to animate the arms and legs of a character. Now, I want the animation to use root motion to export it to Unreal Engine 4. I have ...
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2answers
57 views

I can't understand Inverse Kinematics

So I am relatively new to Blender, and while figuring out the process that is rigging, and applying Inverse Kinematics to my armature, I came into contact with a weird problem, Normally, inverse ...
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1answer
16 views

Using Inverse Kinematics and/or Pole Targets to move hair bones in unison?

I have a model whose hair is composed of several strands that I have each connected to a bone as part of the whole armature. What I want is for each "hair bone" to rotate at the tail in correspondence ...
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1answer
386 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
30 views

Bone constraint rotation not working correctly

I am following a skeleton rig tutorial on youtube step by step and despite having the exact same setup, my armature behaves incorrectly. https://youtu.be/jp_SqjB0468?t=920 at minute 15:40. This is the ...
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1answer
783 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
128 views

Torus animation rig

I am trying to deal with Blender's IK solving system (though maybe I don't need it at all?). I need to animate torus into a smile-like figure (upside- and downside-"smile" animation will be for the ...
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0answers
21 views

How to Rig This

I have this Bone Rig that I don't know how to rig. Think of it like a dog ear. Here's a picture. I'm trying to figure out how to rig it so that the bones on the right side are the control bones. ...
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1answer
28 views

Finger Isn't Flexing

OK, I am new to rigging, so hopefully this is an easy question to answer. I've got a finger rig, which I made by following a book, to be specific, the Second Edition of Oliver Villar's book, Learning ...
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1answer
20 views

Wacky IK arm Movement

I have an arm rig shown below. C stands for control, and D stands for deform. I'm having a problem where when I try to move C_Hand in order to move the forearm, it does move, but it spins around ...
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0answers
23 views

Which algorithm does Blender use for Inverse Kinematics?

Is there any documentation how the Inverse Kinematics Bone Constraint is implemented? I assume the problem is written in some kind of minimizing problem and ...
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1answer
124 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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1answer
20 views

Heel bone twists strangely under rotation, need to resolve in order to progress

I have about 13 animations already made for an armature and now I am getting a very alarming, unexpected result that I need help identifying the cause of and fixing: When I try to rotate the entire ...
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1answer
98 views

Problems with IK Rigging and Ragdolls

I'm currently working on a game that uses an AI system that heavily depends on having humanoid rigs (and ragdoll physics), and I have a modeler/animator who made this character for the game that looks ...
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1answer
48 views

Hand is not glued to gun as expected

I have a character mesh with a 2 handed gun held in his right arm and supported by left arm. IK and constraints are set properly as suggested here: Rigging two handed weapon Still, it seems like the ...
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0answers
15 views

Converting FK animations to IK

I have already created a few animations (idle, run...) for a character that I rigged using FK, because I didn't know about IK at the time (I'm very new to animation). However I recently learnt about ...
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1answer
33 views

What Inverse kinematics technique does the legacy IK solver use?

There are different IK techniques like FABRIK, CCD, Jacobian inverse technique etc. Does anybody know which one Blender's legacy solver uses?
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1answer
21 views

How to make ik target overlap with its constrained bone's location

I know that the general practice when creating an ik rig for say a leg, you constrain lower leg bone to ik target and create a copy rotation constraint from the ik target to the foot. Now I would ...
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1answer
269 views

Copy rotation rotates through wrong axis

I want to rotate hand bone when I rotate IK bone as well. So I decided to using Copy Rotation constraint. Here's how looks like: Nothing special, important thing is that Hand Bone has Copy Rotation ...
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1answer
3k 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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0answers
22 views

Having trouble Parenting a Bezier curve

So I am working on a mesh of a character with a tail. I used a Bezier curve to IK that but I'm having trouble. Everything is fine until I try to parent the curve to the armature in some what either ...
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1answer
65 views

IK Rotation option for opposite end

I have a string of bones with an IK constraint at the end that uses most, but not all, of the bones. When the target is brought back, the first bone bends greatly away from the bone before it, and the ...
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0answers
14 views

Floor constraint makes armature move floor

I have a model with an armature, with IK legs, that I want to animate. Before I begin animating, I would first like to constrain it to a rooms boundaries, specifically the floor. When I set up the "...
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1answer
21 views

Switching a bone's head and tail

I was trying to set up IK on a model I'm using for animation, when I noticed the foot was trying to bend the hip rather than the knee: I think this is because the thigh bone is facing the wrong way (...
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0answers
32 views

Make Pole Targets follow the bone

Im trying to rig a Humanoid in blender, and I have the Iks done with their Pole Targets. My problem its that I dont know what its the best option to make them follow their bone position. I have tried ...
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1answer
297 views

when I add IK, my bone moves out of place in Blender 2.8

please see the picture, after adding IK the bone is moving out of my character, please help.
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0answers
15 views

Bizarre animation issue after fbx export -What am I doing wrong?

I seem to have run into an issue with my animation that I simply can't wrap my head around. My fairly simple run animation looks fine while it plays in the original blender file, but as soon as I ...
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1answer
319 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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2answers
818 views

Animation advice please (sliding pipes with handles)

Hi this is my first post. I've been learning Blender 2.8 for about a month with the aim of creating some simple, stylized animations for a medical device. The device (see picture) consists of two ...
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1answer
25 views

How to limit the rotation of a bone in an FK chain?

Im using metarig to rig a model of a robot and the arms and legs have brackets connecting the joints where rotation in a certain axis would cause part of the model to twist into the mesh of the ...
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1answer
39 views

Does 'Inverse Kinematics' override other bone constraints?

Rig is for a quadruped, I have IK applied at second bone, but I want to place a limit on the to the toes, so that they can't go below 0 on the Z axis. Selecting the Limit Location bone constraint ...
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1answer
61 views

IK constraint causes crazy global rotation

I was following a rigging tutorial (first minutes of third video) on a simple model I made earlier. But when I add an IK constraint on the bone shin.L to have the bone foot_IK.L become an IK ...
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1answer
39 views

Made the leg IK bone, tried to attach the upper leg bone to the pelvis but after attaching it, the body rotates a little bit

I'm relatively new at rigging in Blender, and I tried to rig a humanoid model that I made. Everything went fine, but after finishing the leg IK bone, I tried to attach the upper leg bone to the lower ...
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1answer
35 views

Ik rig severely deforms, target pole rotates torso?

For some reason my rig's targer pole isn't working properly. I was trying to practice rigging poses by using an image as reference, but I didn't know why my pose was limited and it wasn't deforming ...
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0answers
58 views

How to fix leg IK rotating foot bone?

I'm rigging a model using IK for legs and arms and initially I set up the IK while the bone roll for the leg and arm bones wasn't 0. After going back to fix the bone roll and redoing the IK, I now ...
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1answer
36 views

Bone won't bend in quadruped leg

So I am rigging a fox mesh, and the method I used of inverse kinematics isn't working like it has on numerous quadrupeds I have rigged. So the leg has four bones in it. Now I put the IK on the second ...
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1answer
74 views

What is the recommended angle to set the Pole angle to when setting up an IK rig?

Is there a specific or recommended degree to set the pole angle at when setting up an IK? I've read that 90 or 180/-90 or -180 are good degrees to set it to, but does it matter? Can any degree be ...
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1answer
39 views

Align orientation in Pose Mode

I'm trying to do a simple manipulation that I'm doing every day at work as a professionnal animator. My experiance is with Motion Builder and 3dxMax, but I'm learning Blender on spare time. I just ...
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1answer
3k 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 ...
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1answer
110 views

How to move bones with IK?

Hi, does anyone know how I can move the end bone? The bone only rotates or scales depending on the connected checkbox. File here:
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0answers
12 views

Why does Mirroring Leg IK in One Frame Mess Up All Other Frames?

i have had instances where copying/pasting/mirroring an ik control have caused weirdness in other frames of animation, but usually, just moving the scrubber one frame then back, or by switching ...
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0answers
14 views

IK leg acts as FK when Torso is transformed on the z axis

I found the following rig the Blend file on sketchfab and tweaked while following DanPro advanced rigging tutorials. Then I noted that I have a strange issue with the rig, and I'm curious as for ...
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1answer
214 views

Exporting Animation without IK targets, poles bones and other controls

I've created a character that has been rigged with IKs constraints for legs and arms and some other custom controls implemented through other constraints applied on control bones (like a copy rotation ...
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0answers
31 views

How to add inverse kinematics onto rigify rig add-on?

So I know how to make a human meta rig using the rigify add-on (the one that comes included in 2.79). I also know how to add additional bones onto the rig, I can do all that stuff successfully, ...
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1answer
486 views

Simple Inverse Kinematics for a slider?

I tried recreating something like this: https://www.instagram.com/p/Bk1tq1DgMRV/?taken-by=flvio.cc The head can move on the x and y axis. The model itself is done, but I just want to move the head ...
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1answer
2k views

How to rig a cartoon-style hose limb?

I was wondering if anyone knows how to set up a hose-like, cartoon-type limb like in this picture? My current setup for my model's limbs uses Inverse Kinematics and actually works quite well for the ...
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1answer
42 views

set specific bone as child of object

The pencil in picture follows a path, and the hand bones connected with IK, I want the last smallest bone to follow the pencil location. when I add constrain in edit or pose mode, it parents the ...