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
votes
2answers
819 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
votes
1answer
2k views

How to rig a cartoon-style hose limb?

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
votes
2answers
547 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
31k 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
5
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3answers
5k 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?
4
votes
1answer
3k 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 ...
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
67 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
361 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
votes
1answer
381 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
449 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
votes
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
654 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
4k 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
157 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
206 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
77 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
votes
0answers
304 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 ...
2
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1answer
3k 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 ...
1
vote
1answer
3k 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
vote
1answer
184 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
vote
1answer
48 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
44 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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vote
1answer
249 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 ...
1
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1answer
124 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
496 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
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1answer
599 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
617 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
vote
1answer
621 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
6k 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
41 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
61 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
151 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
36 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 ...
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vote
3answers
247 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
515 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
1answer
141 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
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1answer
313 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 ...
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vote
2answers
342 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
393 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
396 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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2answers
181 views

Help with IK Rigging

I have IK rigged my model legs but this happens. we all know that it suppose to go forward not backwards. Can someone help me . Thanks ^_^
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0answers
43 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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0answers
26 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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0answers
27 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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0answers
34 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 ...
1
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1answer
104 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
324 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.
1
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1answer
307 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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0answers
39 views

Switchable behaviour for knee bending in IK setup

Making a knee bend in a desired way in IK setup, is as simple as just changing that bend in edit mode. But what if I want the knee to be able to bend both ways, depending on situation. A switchable ...