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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11
votes
1answer
4k 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
votes
2answers
1k 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, ...
9
votes
2answers
910 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 ...
7
votes
3answers
9k 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?
7
votes
1answer
40k 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
votes
1answer
9k 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
4k views

Enabling IK stretch in the IK Constraint does nothing?

Enabling IK stretch in the IK ConstraintS Stretch in the IK Constraint does nothing?
4
votes
1answer
9k 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
2answers
688 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 ...
3
votes
1answer
119 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
628 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
493 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
votes
1answer
6k 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 ...
2
votes
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 ...
2
votes
1answer
96 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
votes
1answer
7k 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
1k 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
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 ...
2
votes
1answer
1k 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 ...
2
votes
2answers
889 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
19 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,...
2
votes
3answers
2k 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 ...
2
votes
1answer
205 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
337 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
2k 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 .
2
votes
1answer
116 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
56 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 ...
2
votes
0answers
214 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
votes
0answers
2k 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
votes
0answers
529 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
vote
1answer
688 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
81 views

Rigging technique for flexible cardboard packaging

I am trying to mockup a packaging project of mine which looks something like this: When the package is closed a little basket is enclosed by two outer cardboard flaps that come down to the sides when ...
1
vote
1answer
815 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 ...
1
vote
1answer
159 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
vote
1answer
16 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 ...
1
vote
1answer
21 views

Base Mesh changes back to its original form after switching to object mode

I downloaded the free RoyalSkies Male Rig from his website just to play around. I made the character less buffed up with proportional editing but it reverts back to its original form after switching ...
1
vote
1answer
65 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 ...
1
vote
1answer
64 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
289 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 ...
1
vote
1answer
753 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
vote
1answer
438 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:
1
vote
1answer
537 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
902 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
852 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/...
1
vote
1answer
25 views

Clearing Transforms Doesn't Make Rest Pose (IK problem?)

I have a problem where my pose position and my Rest Pose position are not the same, even when I have cleared all transforms for the pose position. It has something to do with the IK bones - perhaps ...
1
vote
1answer
26 views

Problem with armature with automatic weight

I am relatively new to blender and was following this YT tutorial, everything was going well and my IK were working on the bones, but, when I tried to parent the bones to the mesh everything went ...
1
vote
1answer
45 views

Shape key driver not working with IK bones

Blender version 2.79: I configured a shape key driver for when the leg rotates in X, to repair the "shoulders", but the problem is that the repair shape key shows all the time, even when the ...
1
vote
1answer
53 views

How to fix clipping knee joint with ik bones?

I created a quadruped character, and added ik bones to the legs, but the problem is the knees start clipping when it bends. i tried to see if changing the weight paint would help, but it just got ...
1
vote
1answer
210 views

How to limit rotation on the last bone of an ik chain

The last bone here, Bone7, has an ik constraint of chain length 3. As in the image, moving ikBone moves the bones all the way back to bone4. This makes me think that the length of a chain doesn't ...
1
vote
1answer
95 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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