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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1answer
19 views

Can I limit what IK bends? Need bones to only move certain way

I was working with a model of a robot arm type thing, and wanted to use an IK constraint with an empty as the target to assist in posing. I abandoned the idea because: The IK constraint seems to run ...
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8 views

Pole target prevent IK restraints

I'm trying to rig a character and I encountered a rather annoying problem: I followed tutorials to create IK and pole targets etc And it work fine, except: if I use pole target the IK constraints will ...
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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
31 views

Issue with IK armature messing up when I try to shrink my model

Hi there I'm starting out and just finished making my first model that has a IK to FK switch, but I only realized afterwords it was way bigger than I'd have liked, so I went to scale it and this ...
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5 views

IK Bone locks even when Rotation Constraint set to 360d

The thigh bone of the character has to be rotated in the forward direction , beyond the extent shown below. There are no limit constraints on the bones. But it locks even when the IK rotation ...
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25 views

IK rigging not working

In the file here attached i can't seem to get the IK working - the legs jump all over the place and the arms rotate weirdly when i select the pole target and i can't change the Pole angle so that the ...
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27 views

rigging landing gear with empties

I am rigging an aeroplane landing gear which looks something like that. Those supports are like hinges that retract and look like those annotations in the below picture. I want it to be rigged using ...
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1answer
80 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
168 views

RIGGING in 2.79b ~ IK handles cause hands/feet to detatch from the body, alternatives? (Foot rigging)

I've followed a couple of tutorials to learn how to rig my flying humanoid character. Both of them tell me to unparent feet/hands bones and parent them to added bones that will work as IK handles. ...
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1answer
21 views

Bones are not bending as intended

First of all, I am pretty new to all of this but wanted to try it, so I followed a tutorial from Youtube by Sabastian Lague. Although it was posted in 2016 and pretty much was changed, I tried to ...
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1answer
18 views

How to prevent Parent bone rotates the child bone in pose mode in Blender 2.8?

As you can see in the figure 1 , I have one child bone connected to the parent , Although I locked all the rotation axis(fig 1) and applied limit rotation constraint to the child bone; when I move ...
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1answer
12 views

Why has IK rotation constraint “envelope” stopped displaying?

Uptil yesterday,for the same Ik rig, IK rotation constraint "envelopes"(red line) were being displayed. However today,with multidimensional constraints they no longer show. Is there an ...
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41 views

How to avoid bone roll on “Rotation Constrained” IK bone?

For 2d cutout animation sidefacing rig (XZ plane), movement and rotation in Y axis is restricted with constraints.However even after applying IK constraints to the IK chain and location constraints to ...
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The bending direction of IK constraints

I modeled the octopus and I am working on rigging. I applied IK constraints to the legs and the direction in which they bend is as shown in the GIF. This is generally good. However, my octopus ...
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1answer
43 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
18 views

How to Avoid/Correct Circular Dependencies on IK Rigs with Drivers?

In reference to this report on mis-behaving IK rigs-- https://developer.blender.org/T76158 The answer is, IK rigs with dependency cycles have undefined (glitchy) behavior. My follow up questions are: ...
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1answer
45 views

Why won't the arms move with my bones?

I am learning rigging in blender so I made this: The bones work fine with everything except for the upper arm on both arms. Take a look here: Here is my rig:
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1answer
14 views

IK Arm rotates in wrong direction

After having done my IK rig, I notice that moving my arm control bone moves it in the wrong direction. I am not able to put my arm in the correct way. How I want to pose my arm (sorry, best photo I ...
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1answer
56 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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0answers
7 views

How do I fix jutting of bones once ik is added

AS i move the wrist bone, the whole armature rotates uncontrollably. Im sorry if the picture isnt very clear. just imagine the armature wierdly jutting about as I move the wrist bone. Thank you
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8 views

FBX Exports IK bone with wrong position, rotation and scale

I have a rigged and animated model with IK bones attached behind the feet. I've exported the model to FBX with the following settings: 4 out of 5 animations seem to export properly, but in one of the ...
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20 views

Need help with this mechanism

I’m trying to animate an umbrella designed by me, whose opening is based on a system of pulling wires. The bone called “Molletta_F_SX” has an IK constraint and, during the entire animation, it should ...
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9 views

Why doesn't Auto-IK work for “ Crouch ” Action? (Override Cyclic Dependency)

While implementing "Crouch" action , the model/armature crouches fine when used with "IK Bone Constraint" applied to relevant bones , but when crouch action is tried on the same ...
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Help regarding stretching and bending animations

I'm new to game development and for a few weeks I've been trying to accomplish something and I'm getting nowhere. I'm working on a game where the player controls a slime (looks like a hemisphere when ...
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0answers
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How to import data in IK

I've been using blender for a few months. I made an IK (Inverse Kinematics) model and have 3D position data of hands. What I've been doing was manually typing in the x, y, z coordinates in each frame ...
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1answer
141 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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Rigify mixing bones between DEF and ORG hierachies

I'm building a custom Rigify metarig with a spines.super_head. The final head bone has a number of (disconnected) child bones for the beak (which are a limbs.simple_tentacle), but once generated the ...
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1answer
12 views

Bone snapping to control bone while making an Inverse Kinematic Rig

Good evening. I have made a humanoid rig and wish to add an IK Controller to the bone "UpperArm.R". I wish to make the bone "CTRL_1.R" bone as a controller bone. Whenever I do so, ...
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1answer
51 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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0answers
14 views

armature relation off center

I have parented a grease pencil drawing to a bone and when I try rotating the bone they don't rotate around the same path. What am I missing? This has worked for me once but then it never worked again ...
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11 views

Parenting arm twist bones to forearm bone

I created separate bones for animating twist of the arm muscles and applied a copy rotation constraint based on the wrist bone. (Y axis only, local space to local space, mix=replace): I had to ...
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0answers
19 views

Inverse Kinematics Issue

I am fairly new at using Blender and I am currently trying to learn how to rig my modeled guy I downloaded off the internet. I was able to rig my guy's leg and is moving smoothly, but when I tried to ...
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2answers
46 views

Sequenced Bone Movement with IK

yet another IK question.... I'm working on an animation project where I have an accordion wall segment that needs to extend outwards, one fold at a time. When I create the the IK bone setup and pull ...
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1answer
43 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
19 views

How To: 1 Bone Moves Entire Arm, While IK Bones Can Bend Arm

I am trying to make a very simple character who has two IK bones in his arm (Besides Target and Pole) to move and bend it. At the moment I am to move his arm, bending it "realistically". However, I ...
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1answer
60 views

How can I make an object's tip position exactly where the IK controller bone is?

So I have this robot leg I made. This is the current setup I have The selected bone is the IK controller bone. When I tried to move the IK bone to the 3D cursor in edit mode I get this. So as a work ...
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7 views

Is there a way to set triggers for IK to pull other bones?

My plan is when I pull my arm far enough forwards it starts pulling on a different bone or IK? I'm using it to pull an Ik Handle to pull the arm to pull the shoulders pull handle forwards. I hope to ...
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1answer
141 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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1answer
655 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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0answers
17 views

Is there a way to make inverse kinematics target anywhere on a path or surface instead of just a point?

I'm trying to make an animation of someone playing the piano (as automatically as possible using the MIDI). It would be nice if I could make them hit somewhere on the key instead of having to specify ...
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1answer
23 views

Can you rotate bones within an IK Chain and allow the IK Target bone to move along with it?

I have a robot arm rigged with an IK and down the chain of the IK there is a joint specifically for rotating on the bone's Y Axis that allows the entire lower arm to rotate. However once I move the ...
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0answers
10 views

Rigging: leg IK is behaving wierd. Clothes are tearing

For some reason, My Leg IK is not behaving properly. Clothes are tearing apart on bending the leg. I following this tutorial for LegIK and setup pole target.
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32 views

Is it possible to add IK's to a pre-existing rigs?

Im trying to add IK' to this model's pre-existing rig, but have no idea how exactly todo it In this case. Is it even possible? This is the file:
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1answer
28 views

newbie question: Move several bones with one control

So i have a humanoid rig and i want it to only do one thing - open and close arms as if hugging someone. I want to have a single control (with one degree of freedom) that moves all the bones ...
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0answers
16 views

How to make IK target bone undetachable?

So I have a arm, and a IK. The target bone of the IK is called wrist. My goal is to make the wrist bone undetachable from the IK bone. This is what I don't want. The wrist bone (purple one, is ...
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1answer
378 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
28 views

Character model going crazy after parenting

For this first post, I wand to detail a weird issue for my character model. I am new to IK rigs, and I just finished my character. The armature has absolutely no problem. After having parented the ...
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1answer
22 views

Bone rigging incorrectly

I am making a rigged character. When the wrist is lifted up, the whole arm should move, and the torso should not. The correct 'connecting line' from the wrist to the collarbone (may be hard to see, ...
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1answer
678 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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The rig rotates automatically when the desired pole target is set in Inverse kinematics

I was rigging my character seeing the tutorial by CG Geek https://youtu.be/SBYb1YmaOMY?t=450. The same process was done but my rig rotates out of model

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