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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10
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2answers
846 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 ...
10
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1answer
3k 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 ...
10
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2answers
979 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, ...
7
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1answer
36k 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
6
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3answers
7k 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?
5
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1answer
5k 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 ...
4
votes
1answer
5k 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 ...
3
votes
1answer
3k views

Enabling IK stretch in the IK Constraint does nothing?

Enabling IK stretch in the IK ConstraintS Stretch in the IK Constraint does nothing?
3
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1answer
84 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:...
3
votes
1answer
461 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 ...
3
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1answer
427 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 ...
2
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1answer
805 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 ...
2
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1answer
37 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 ...
2
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1answer
1k 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 ...
2
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2answers
762 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 ...
2
votes
1answer
5k 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 ...
2
votes
1answer
183 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 ...
2
votes
1answer
250 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 ...
2
votes
1answer
93 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. ...
2
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0answers
56 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 (...
2
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0answers
1k views

Creating a generic IK/FK snap script

I've tried deconstructing the Rigify addon to isolate the script part that handles IK/FK snapping, but so far I've had no luck. Rigify is a very nice tool, but I'd like to get the snap functionality ...
2
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0answers
406 views

Controlling robot servo arm (in real-time) via 3d model in blender

I am trying to create and control a robot arm (made of servos) via it's 3D model. I am big fan of Justin Dailey's work -- he was one of the first few people to accomplish this but his 7 year old ...
1
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1answer
422 views

Rigging this mechanical linkage in Blender

I am tackling this mechanical linkage which moves in the x axis (see image). I would like to do it using IK but the problem is that I can't establish a relationship between the blue and green parts ...
1
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1answer
4k 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 ...
1
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1answer
73 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 ...
1
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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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1answer
56 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 ...
1
vote
1answer
130 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 ...
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1answer
479 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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1answer
248 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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1answer
531 views

IK not working for legs, where am I wrong?

I'm stuck in this armature creation where IK works pretty well for harms but knees don't curve as they should.. I set same but something is not working..
1
vote
1answer
845 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 ...
1
vote
1answer
728 views

IK lagging behind to point at target bone

I am using Blender 2.75. So I have an armature for a pig. I used IK to have the legs always bend (a certain direction using a pole target) to connect with the target bone. I am pretty sure this is ...
1
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1answer
722 views

How to make sure the final bone in an IK chain doesn't rotate?

I've got a chain of inverse kinematic a bones, and I want the one that I grab to be unable to rotate while it is moving. How do I do this? My setup is a rigged car assembly arm: http://sendvid.com/...
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2answers
7k 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 ...
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1answer
94 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
111 views

Character Hands Stuck During Animation

I'm having a problem with some of my animations. My character is an ape and I designed 19 animations. For two of them, sometimes my ape's hands get "stuck" in place, and the rest of the mesh contorts ...
1
vote
1answer
376 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 ...
1
vote
1answer
60 views

Incorrect IK behaviours

I am rigging a robot for some personal training, and I got into a very weird issue while rigging the legs. Here are my two foots, both are parented to the right bones, rigged to their respective ...
1
vote
3answers
764 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 ...
1
vote
1answer
728 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 ...
1
vote
2answers
1k views

Disable IK then re-enable with different pose

So first of all I'm very-very beginner in Blender. Previously I have used Source Filmmaker. In SFM you had an option to apply IK rig to models and after that detach it. Now in Blender I have a model (...
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1answer
504 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 ...
1
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1answer
189 views

Spline IK Bake Pose

How can the Blender User get the desired visual results for Bake below? Legend for image above. The letter A is next to a selected Armature which henceforth, for brevity, will be named [A]. The ...
1
vote
1answer
546 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 ...
1
vote
1answer
1k views

IK local rotation locking

I have an IK chain, and there are some axes that I don't want some bones to rotate around. So I go to the bone tab, scroll down to Inverse Kinematics, and lock the axes I don't want the bone to rotate ...
1
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1answer
381 views

Inverse Kinematics Documentation

I am currently writing a thesis and for the practical part I use blender to simulate something with the Blender IK Solver ( and iTaSC). Are there books etc about the implementation or the usage of the ...
1
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2answers
397 views

How do I put a constraint on a bone affected by chain length?

I'm trying to figure out how to put a constraint on the shoulder bone as shown in the images below. What I'm looking for is a realistic motion where the shoulder moves upward ONLY when the arm bone ...
1
vote
2answers
445 views

MakeHuman Inverse Kinematics

I have a makehuman model that I want to use for animating. However, with the current forward kinematics, it's very difficult to animate each bone one by one. So after messing around, I figured out how ...
1
vote
1answer
513 views

How to maintain IK chain angle to target?

I've got a robot assembly arm (http://sendvid.com/ze9l813s) set up with an inverse kinematics solver, but I don't know how to keep the end bone from rotating. I need that bone to remain perpendicular ...

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