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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20 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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18 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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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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18 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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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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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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15 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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18 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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15 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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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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18 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
25 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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1answer
18 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
50 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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19 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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1answer
12 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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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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31 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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30 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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67 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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1answer
45 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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How do i fix this IK

Basically, I can't rotate the thigh higher than this point with IK, or when I try to rotate it separately. If I remove the IK, then I can rotate it how ever much I like
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rigging & IKs : should one parent Pole Targets to Targets?

I'm learning rigging, and I have got a "philosophical" question here... I was wondering if, when using IKs, people do usually parent Pole Targets to Targets ? From what I understood, a Pole Target ...
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Knee vertices not following Foot IK. Seem locked in place

I'm trying to make the knee and hip joints respond to the footIK but the knee vertices seem stuck in place. Probably an easy problem, but I'm new to blender. Any help much appreciated!!! Thank you
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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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44 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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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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685 views

How to export animated character from Blender 2.8 as fbx to Unity?

I have a fully rigged and animated character with shape keys. I created it in 2.79, exported it using ASCII with the settings below and could use it in Unity without any problems. However, after ...
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1answer
27 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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1answer
19 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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2answers
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inverse kinematic animation alignement of mouvement issue

I have rigged this elephant mesh with inverse kinematic but when I move the leg with the controler bone, the leg bend inward (my goal is to have a leg that bend along the Y axis). Here are picture to ...
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54 views

Deform bone will not follow IK bone perfectly with copy rotation

I am trying to separate bone layers with ik fk central and deform layers. I am having problem with copy rotation from IK>central>def bones (each in different layers.) The deform bone will not follow ...
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74 views

How to rig a plate so that it points to a target, with off-centre tilt, and constraints on elongation and tilt

a question from someone who has never done rigging before. I need to make a plate (in my example: a cylinder) follow a target (a empty). But with some constraints: There are three degrees of freedom:...
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178 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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1answer
293 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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37 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
29 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
26 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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27 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
36 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
58 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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1answer
326 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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151 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
75 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
46 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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2answers
83 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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40 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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30 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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29 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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47 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 ...