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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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12 votes
1 answer
6k views

How to rig a cartoon-style hose limb? (cartoon arm)

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 ...
Hungry Moogle's user avatar
10 votes
2 answers
2k views

How to best animate a licking tongue?

I'm trying to animate a tongue that is licking an object. First I thought the tongue could be a soft body colliding with the object that it is licking, however, with that many parameters and options, ...
kindoflike's user avatar
9 votes
1 answer
45k views

How to IK rig legs

I have a simple character. I would like rig the legs so that I can easily control them. How can I IK rig my characters leg? .blend file
Vader's user avatar
  • 14.8k
9 votes
2 answers
1k 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 ...
Andrew Dyall's user avatar
8 votes
3 answers
12k views

What is Inverse Kinematics?

Why do we need the Inverse Kinematic constraint in rigging? What is the benefit of it, what is a situation where I can use it and what does it do to the armature?
Mahmoud Elkout's user avatar
7 votes
2 answers
18k 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 ...
blablaalb's user avatar
  • 177
5 votes
1 answer
1k views

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 <...
Erfan Games's user avatar
4 votes
1 answer
6k views

Enabling IK stretch in the IK Constraint does nothing?

Enabling IK stretch in the IK ConstraintS Stretch in the IK Constraint does nothing?
ashwin's user avatar
  • 1,749
4 votes
1 answer
17k 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 ...
Seq's user avatar
  • 41
3 votes
1 answer
9k views

How do you lock the rotation of a bone in an IK chain?

How can you make an IK chain of bones where one of the bones does not rotate relative to it's parent bone but is still part of the IK chain? Specific example: I have this simple arm rig with IK that ...
Ben Mora's user avatar
  • 852
3 votes
1 answer
724 views

Inverse kinematics ignore rotation constraints

I applied rotation constraints to my bones so that they can only rotate around the X axis. Then I use the "inverse kinematics" modifier and it completely ignores the rotation constraints. ...
arachnoden's user avatar
  • 1,369
3 votes
1 answer
1k 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, ...
Leo_xfh's user avatar
  • 33
3 votes
2 answers
2k views

Mirrored pose problem (IK goes crazy)

I have a problem when I try to mirror my run animation, the IK bones on the foot go completely out of control on the mirrored portion of my animation. The white keyframes are what I copied, and the ...
Hotpockets26's user avatar
3 votes
1 answer
618 views

Limit stretch length of bone driven by IK

I am rigging a mic stand, and using stretch bones to drive the position of bones parented to the mesh. I'm using an IK on the end of the stand, to control the position of the mic arm. My issue is ...
Onion-IO's user avatar
  • 115
3 votes
2 answers
8k views

Worm/Tentacle/Tail/Spine Animation with ease

I wanted to rig and animate a worm using IK, so that if i move the tip of the tail i get the bend one would expect. Unfortunately using plain IK the tip will point towards the ground instead of ...
brunnerh's user avatar
  • 143
3 votes
1 answer
676 views

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 ...
Ryth Azhur's user avatar
3 votes
1 answer
596 views

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 ...
Frofidor's user avatar
3 votes
1 answer
214 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:...
Nicola Sap's user avatar
  • 12.9k
3 votes
1 answer
1k views

Mesh is deformation is mirroring very strangely, how do I fix this?

I am rigging a crossbow to be exported to Unity3D. It is currently just a model of a bow, and I am trying to perfect the rig as much as possible before I model the stock. I have been trying to fix a ...
FeeeshMeister's user avatar
3 votes
1 answer
4k views

Why is my model distorting when I weight paint?

After importing a .OBG file and rigging it, when I weight paint, my model deforms. I use Blender v2.77 .
F. Lu's user avatar
  • 35
3 votes
1 answer
613 views

Model gets squished because of Spline IK

Recorded a video of the issue happening: https://youtu.be/LFoUrE1OHwQ Added a gif in case the video goes down: The head of my character gets squished when one of the controls for the Spline IK is in ...
Opponent019's user avatar
2 votes
2 answers
761 views

Problem with inverse kinematics and locking bone rotation

I have a simple bone system: I only need to lock the rotation of the "shoulder" bone along the Z axis (Y in bone local space), I lock the rotation in the "inverse kinematics" menu ...
arachnoden's user avatar
  • 1,369
2 votes
1 answer
61 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 ...
Valeriia's user avatar
  • 229
2 votes
1 answer
2k 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 ...
MatterGoal's user avatar
2 votes
2 answers
134 views

Rigging - Push object along specified axis (probably IK problem)

I have three shapes like this on graphic below. Objects A and B are connected with object C and I'm trying to get object B translated along Z axis only when object C pushes it due to rotation of ...
Wh1T3h4Ck5's user avatar
2 votes
1 answer
97 views

Rigging a mechanical plunger: bone constraints lead to offset results

I have a model for a soccer robot which has a "leg" that can be used to shoot a ball. It is capable of shooting from a low and high position, allowing the ball to be shot through the air or ...
Imetysaw's user avatar
2 votes
1 answer
236 views

Train Pantograph IK Rig - Rotating armature in Object Mode changes pose

I am a beginner with rigging in Blender. I have successfully created a rig to pose and animate a train pantograph using inverse kinematics. Now, I want to reposition and rotate the complete armature ...
Karma's user avatar
  • 23
2 votes
2 answers
185 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 ...
Dennis's user avatar
  • 23
2 votes
1 answer
9k views

how to stretch ik bone in blender 2.8

in blender 2.7 we have Autostretch Ik for stretching ik and not stretching it, but I can't find it in 2.8. I want this result: please see the picture.
mohammad ehsan's user avatar
2 votes
1 answer
2k views

IK rigged elbows have unexpected "laggy" or "jumpy" behaviour when animated

To keep this both as short and as informative as I can: The character I'm animating has bones in his arms set up like this: The lower arm has a regular IK constraint with a hand controller as a ...
Kochich's user avatar
  • 51
2 votes
1 answer
2k views

Why does this Copy Loc contraint not work with this IK bone?

I'm working on a (toy) VR kayak simulator, but have limited rigging knowledge. I'm attempting to have two IK rigged arms holding onto a paddle, so they will animate with the paddle's movement, like ...
Jordan Davis's user avatar
2 votes
1 answer
174 views

Problem with auto IK, some bones turned stiff (Auto IK doesn't work)

First time working with armatures and IK, I had a rig working and somehow I did something that broke it. I'm using the Auto IK option for it. It's a 2D spider (don't mind the leg count) and each leg ...
Turtle Barrel's user avatar
2 votes
1 answer
219 views

Root of IK arm is twisting

The root of my IK arms are twisting, this is because I need to either roll the bones or apply a pole angle in order to make the elbow fold in the correct direction, unparenting and removing the ...
Anonymous2840938028's user avatar
2 votes
1 answer
248 views

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 ...
makerbaker's user avatar
2 votes
2 answers
209 views

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 ...
atkaizer's user avatar
  • 466
2 votes
1 answer
521 views

Inverse kinematics acting weird

I added a rig with both forward and inverse kinematics but whenever I move the right hand then for some reason the left arm moves in a weird way, same withe the feet. I have already checked and every ...
Jamie Gosling's user avatar
2 votes
1 answer
332 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 ...
allen's user avatar
  • 1,019
2 votes
1 answer
1k 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 (...
Teddy Dykhoff's user avatar
2 votes
1 answer
13k views

Keep rig feet flat on the ground (IK Rig)

So I have an IK rig setup; however, when I move the pelvis down to make the character squat the feet fall through the ground. e.g. How can I set it up so that when I move the pelvis down the feet ...
masterj2001's user avatar
2 votes
1 answer
2k views

How to switch to Inverse Kinematic for Make Human model in blender 2.78?

I exported a human in mhx2 format from MakeHuman and imported it to Blender 2.78a. What is necessary to install in blender in order to see the MHX Main panel and/or switch from FK to IK mode for ...
camcam's user avatar
  • 135
2 votes
2 answers
1k views

Bone shrinks mysteriously under the influence of an IK Constraint

I tried setting up inverse kinematics on a very simple test character rig and the bone went all crazy. It shrinks the leg to a stump when the IK Constraint's influence is at 1. I've set it to 0.5 so ...
Mentalist's user avatar
  • 19.3k
2 votes
1 answer
437 views

How do I copy bone properties (rotation constraints) with IK from one bone to another

I am trying to set up bone constraints on the fingers of my armature with IK. and all the information on how to copy constraints from one bone to another only apply to the constraints tab and not the ...
Mulacela's user avatar
2 votes
1 answer
158 views

IK claw control with driver / controller

I was doing a claw rigging and in-order to perform the claw to open and closing action I want to implement a driver or an object which will provide its translation data along the z-axis, unfortunately,...
Neail's user avatar
  • 81
2 votes
3 answers
3k views

Why does the elbow turn the wrong way?

I'm doing a character for a (very) low poly game. Since I already had a very basic IK rig laying around, I figured I'd adapt its armature to the recently created character. However, even after ...
slashblock's user avatar
2 votes
1 answer
239 views

Was Y-Axis IK Stretching removed in 2.79 RC2?

The stretching I'm referring to is the slider seen here in the IK Constraints settings for individual bones, not the "Stretch To" constraint: A while back (a little under a year ago now I think), I ...
DJTHED's user avatar
  • 31
2 votes
1 answer
407 views

Bending animation with rig?

I'm trying to make an android animation, but I am stuck at the rigging part. I want his arms and legs to be able to bend like plastic / rubber and use a rig. I've heard of lattice modifier, but that ...
tastyturban's user avatar
2 votes
1 answer
205 views

How to make an IK chain stay above another IK chain

I modeled a recurve bow and now I'm rigging it. The wooden body of the bow bends correctly. But at the start of the pulling motion the string's IK chain straightens and goes trough the tip curvature. ...
Cesco's user avatar
  • 21
2 votes
1 answer
39 views

Parent -> child wobbling, witching, shaking inverse kinematics

When I was simulating a car using the Launch Control addon, I noticed that the parented driver (a character) does not follow the animated car correctly, shaking intensely. A similar phenomenon occurs ...
Bogu's user avatar
  • 204
2 votes
1 answer
68 views

IK not tracking to target

I've been making an IK mechanical arm/connector for a project of mine, and I cannot get the bones to properly track to the target. Most of the bones have rotation constraints in the IK menu, but even ...
l_yr3b1rd's user avatar
2 votes
1 answer
200 views

IK only moving the last bone of the chain

I have this skeleton for a cow : With this property for both IK bones : The problem that I have is that when moving the front leg, the bone directly connected to my bone with IK constraints will not ...
Monique Dumont's user avatar

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