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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39 views

Force IK rig to bend knee “Wrong” way?

I've designed this mech's legs so they can fold up when crouched but that left the knee pivot behind the top one so my IK rig bends my leg the wrong way. Can I have my knee behind the "pelvis" and ...
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1answer
26 views

IK Legs Mess Up in Render

I have created an animation with this robot, and everything looks fine and normal in the viewport, but once I render it out in any render engine it does this weird thing that you see in the first ...
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2answers
29 views

Parenting armature to mesh with automatic weights

I'm just beginning in the animation world and I've been studying Blender – so far it's been good but now I've got a snag. Whenever I parent my mesh to a certain armature or bone on the right side of ...
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16 views

Robot animation, joint angles and cloth cover

I'm new to Blender 2.8 and need help creating a cover for a robot arm. I've been working with tutorials but would like to hear about better practices or better approaches to create my animation. What ...
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1answer
97 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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14 views

Python API: How to export bone angles in real-time?

Attached is a screenshot of a simple IK armature. Is there a way to export the bone rotations (in radians or degrees) into the terminal window (as a plaintext) in real time? As in: "When I move the ...
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1answer
68 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
58 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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49 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
32 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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107 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
47 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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22 views

My IK rig won't flip properly

i'm having problems with my IK rig. I'm working on a generic character model rig with multiple animations. One of these animations is a walk cycle and a practice that a lot of people implement is the ...
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8 views

IK Foot moving after enabling rotation

I'm trying to give my rig an IK for the foot, but whenever I enable the rotation tickbox on the IK bone options, the foot snaps to a complete different place. Is there anyway to prevent the foot ...
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19 views

Model breaks when animating

I use blender 2.8 and animated using armature, bones and inverse-kinnematics and applied auto weigths. I Followed these tutorials to do it: Youtube tutorial by Royal Skies LLC The armature animation ...
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37 views

Animating tentacles

I'm doing some tests for a character for a videogame I'm making. The body is straight from MakeHumans, I imported it with the rig because it would save me the pain of rigging the character myself (...
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1answer
39 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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1answer
81 views

Exporting IK bones from blender2.8 to unity has problem

I'm working blender2.8 with unity3d but when I export my model from blender to unity My Bone plays animation so weird see this First picture in on unity. second one is on blender2.8 Two legs have ...
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22 views

How do I reset pose with IK?

I can't seem to find any answers on this as everything pose reset question I found is ALT+R/S/G. I've rigged a leg with IK using the basic methods with a pull target and control bone. But now I can ...
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20 views

How to force IK chain bend direction?

So, after tons of misadventures in the world of Blender I decided to rig my first model. So far I made good progress, the base armature works quite well and I started to do some IK rig stuff. Legs/...
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16 views

How to I bake IK targets into an animation?

I'm new to Blender, I have a rigged character in Blender. He is riding a ATV(quad). His hand bones have IK constraints with targets (empties) positioned at each handlebar. Everything is working as ...
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1answer
52 views

How to scale along a spline Ik rig

I was curious if it was possible to scale this along the spline of a spline IK rig almost like it was growing along the spline. Below is how it scales now but I do not want it to look like this I ...
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80 views

RIGGING - How to make a “correct” arm twist

I try to make a 100% custom rig system based on stretching bones, and I kind of manage to do everything correctly, BUT, and that's a problem I've met for years on Blender, I can't find a way to make a ...
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31 views

Keyframe non IK bones

I've created a somewhat working IK rig for a video game character that I would want to animate for use in the game through modding. My issue is that when I move my IK bones and set a key frame for ...
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17 views

Does anyone know why my bone name won't show up in the bone tab for the target when doing constraints?

I'm trying to make an IK bone, but it won't show up in the constraints tab, I press the target and go to the armature, then I press the bone tab and the name won't show up, does that for the rest of ...
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1answer
13 views

I made an IK foot bone and it moves the entire body while bending the foot. Anyone have any idea's why this is happening?

Here's the file if anyone needs it so they can help figure out the problem, thanks.
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1answer
53 views

I rigged a human model with Inversed Kinematics but it is not working. How can I debug this?

I'm having a hard time understanding how to debug my rig not working. I created the human model and now I am trying to rig the right leg. How could share more information about this? I would like my ...
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1answer
19 views

Targeted bones don't move with the rest of the armature

IK bones don't move with the rest of the armature Ask Question Asked today Viewed 9 times 0 Whenever I move the main controller bone of the mesh, most of the armature moves except for the bones the ...
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1answer
26 views

IK Flexible Bones Twisting Mesh

I created a tentacle, added an armature, changed the bones to b bones, added ik, target null object and noticed that the bones looked twisted (without me doing anything). Once I started posing my ...
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8 views

Auto Key does not Key limbs that are moved with FK_IK Snapping Rigify

I am using a rigify rig. I have auto key on. After creating an animation using IK, I want to snap the FK limbs to the animated IK limbs. Auto Key does not record the new position of FK limbs once they ...
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19 views

2.79 FK to IK Rig and Drivers, Why are they Conflicting?

blender 2.79 i'm not real versed in this, but i was following this tutorial: https://www.youtube.com/watch?v=r-G3ocQ5cjg basically, the pose bones follow the ik chain bones when the ik switch is on. ...
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1answer
22 views

3-bone IK chain not rotating properly, why?

I ran into a weird bug where my 3-bone IK chain isn't behaving as expected. I've made other quadrupeds in the past and had no problem like this. As far as I can tell, the IK constraint is also exactly ...
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19 views

Does the iTaSC IK Solver Turn off the FK Rig?

i put some iTaSC IK constraints on my rig, and have been using them to animate. however, i turned the IK constraints OFF to pose the fk rig... and my fk bones will NOT move. is this a side effect of ...
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1answer
398 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
276 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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19 views

Bone chain with IK bends uncontrllably/randomly when I move it's helper bone

I'm trying to follow this yt tutorial on inverse kinematics https://www.youtube.com/watch?v=Pt3-mHBCoQk ...but I can't seem to be able to move the bones in a single plane like in the video, my rig ...
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1answer
549 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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2answers
88 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
48 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
469 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
877 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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21 views

Mesh partially wrinkling when armature moves

I'm new to Blender and am having an issue with some joints wrinkling when moving the armature. In the attached image the left knee is exhibiting this problem, while the right knee is bending as I want ...
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1answer
128 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
204 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
458 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
4k 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
460 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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1answer
46 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
37 views

Offset Bone Rotation and Inverse Kinematics Wheel Steering (Rigging Setup)

I am trying to rig an armature with 2 links and a wheel. The wheel can rotate. The two links need to help lift the wheel (1 DOF) and steer the wheel (1 DOF). I followed a rigging tutorial online and ...
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1answer
448 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 ...