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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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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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Bones flip out when posed using inverse kinematics

Okay so I have rigged many armatures in my time in blender, and this problem happens from time to time but its usually slight enough to ignore, but not this time. So I have a rig made for a human, ...
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Added IK bone messing up excisting animation

I have downloaded and imported a model from Mixamo. It doens't import right, but after some experimenting I managed to get the existing bones right. The problem is that I want to add IK to the ...
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Blender IK animation becomes inaccurate when exported

Animating a robot with 8 bones, I chose to use IK animation with the iTaSC (SDLS) solver. In Blender everything works great, but when exporting the animation there are accuracy issues. I made a ...
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18 views

Adding Inverse Kinematics to this rig guide

i've been following this tutorial for adding IK to rigs but it does not seem to be working: https://www.youtube.com/watch?v=Z0IhgS_us5U. like once i set up the IK constraint for the leg and connect it ...
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33 views

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

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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51 views

Inverse Kinematics to rig a Truck with a Trailer

I'm trying to animate a truck with a trailer on it can follow a path realistically. I know I should be rigging the model using inverse kinematics but I can't get it to work. I found a previous post ...
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78 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.
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67 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.
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18 views

Unable to create linear bone slip, slid or stretch on Inverse Kinematics

This is a simplified version of part of a complex project I am currently working on. See image to understand my description. The slider is the input that is powered be continuous linear back and forth ...
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18 views

Bone object tracking with python code in blender

I have working inverse kinematic code in python for 3dof manipulator robotic arm. I am trying to model that robotic arm with bone in a blender. I have already written the python code to do it in the ...
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29 views

IK on eyeball does not move how I tell it to - Resolved

So I have this IK restraint so that my eye follows a bone that I can position wherever I want the eye to look. However, I have come to find that when I try to move the handle, it is very sporadic. I ...
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26 views

Changing Influence value on Bone Constraint frame by frame

So i'm new to animating in Blender. And I'm currently having trouble with the 'Child Of' on the Bone Constraint, for some reason the 'Influence' value is not working frame by frame. What I mean by '...
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24 views

Bone Constraints do not appear in the bone constraints tab

I imported an XPS model into Blender with the XPS addon. Then I found that its IK doesn't work properly. So I decided to clear the constraints and fix it myself. But I found nothing in the bone ...
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21 views

Bones warping out of place with inverse kinematics

I've been struggling with this problem for a while now. When I add inverse kinematics to my quadruped animal's front legs and try moving them in posing mode, the entire leg warps out of place and ...
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34 views

Inverse Kinematics Knee

I'm out of options, I have to ask... Why is the knee in the below picture not always pointing to the ik.knee.l bone? I've read this (VERY informative) and I also followed this tutorial... But no luck....
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39 views

Ugly deformation for wrist and shoulder with IK

New here. I've been implementing some basic IK stuff for a rig of mine. The arms, the legs, etc. Overall I'm happy with how it's been going, but there is a problem. Whenever I go to push the rig's ...
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84 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 ...
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Inverse kinematics without a target, or by targeting to self

I have a complicated rig where the end bone in an IK chain needs to exactly copy the transforms of a separate control bone, so i can't have a target bone because that would mess up the "copy ...
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2answers
541 views

How to IK Rig a human arm with external controllers?

So in the above image: Symbol Description S - Shoulder U - Upper Arm L - Lower Arm W - Wrist F - Fingers Now, I have to IK-rig it from upper arm to fingers and I was ...
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75 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
134 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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30 views

Why did my IK bone shrink?

I was animating a run cycle and this happened at some point but I can't figure out how or when. Any help?
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43 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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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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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 ...
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Should I include shoulders in arm IK?

When doing inverse kinematics on arms, is it a bad idea to have the shoulder bone be a part of the reverse chain? I find it very hard to constrain the rotation of shoulders when I include them. I ...
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19 views

how to set up IK bone copying y rotation of target bone

I am setting up wrist IK and trying to get the forearm to copy the y rotation of the hand/ik target. I put a copy y rotation constraint on the forearm directed at its IK target and it works for y only ...
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66 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 ...
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43 views

Activating IK on Existing Armature

How do I activate IK (Inverse Kinematics) on this rig? I feel like it has the necessary bones. I appreciate your help. I would really like to enable crouching and gyrating of hips for dance animations ...
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29 views

Bone won't bend in quadruped leg

So I am rigging a fox mesh, and the method I used of inverse kinematics isn't working like it has on numerous quadrupeds I have rigged. So the leg has four bones in it. Now I put the IK on the second ...
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1answer
29 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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156 views

Copy rotation rotates through wrong axis

I want to rotate hand bone when I rotate IK bone as well. So I decided to using Copy Rotation constraint. Here's how looks like: Nothing special, important thing is that Hand Bone has Copy Rotation ...
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126 views

About local space in action constraint

As you can see the picture below, if you change the rotation value by rotating the parent object (box), the rotation value of the child object (monkey) is retained. Child objects have their own local ...
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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 ...
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IK Constraints Swinging Around Wildly

My IK's are out of control. I've set up enough simple IK's to know how to do it correctly and I have not idea what's going on here. I've tried redoing the IK's, recreating the bones completely, but ...
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42 views

How to use spline ik with curve with modifer applied? (How to use splike ik, for snake movement animation ?)

I try to use Spline IK Constraint to make "Snake move". I have armature with 4 bones, and I apply Spline IK Constraint to it. Its don't want to work with curve after modification, it uses curve ...
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Rigging, how do i keep my target at the bones position?

in my project, i want my target bones root(1) to always have the position of the given bones tip/root(2) even if i change my pose with ik, but i dont know which constraint would achieve it. And i ...
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87 views

Object doesn't get motion blur in several frames

I made a robot animation with IK rig. After rendering, as you can see on image 2 & 4, the robot didn't get motion blur at all but the furniture still get the motion blur. image 1 & 3 works ...
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48 views

How do I properly fit this tail with IK?

I have this tail rig that I'm using IK to animate with. I'm fairly new to rigging and IK, however, I've come this far: The problem is I want to have more control over the curve that the IK Target ...
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1answer
26 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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1answer
30 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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120 views

Switching from IK to FK-losing pose

Learning rigging and ran into this whole ik/fk switch thing which is confusing. I rigged a leg using the usual IK(heel influencing shin>thigh), I keyframe a leg raise and see that to get the exact ...
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92 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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3answers
129 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 ...
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1answer
23 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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259 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 ...
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20 views

Display rotation of certain bones in a kinematic study model

I'm creating industrial robot inverse kinematic rig. Is a way to display rotation of a bones after placing IK bone? The best would be a kind of chart thet shows rotation for any of 4 motors like this: ...
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243 views

Rigify IK Not Working Properly

I've been working in a character during my free time, and I came to the point where I decided to Rig it using rigify. Everything went fine.. Until I tried bending the legs. Instead of bending like a ...
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1answer
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pole targ it does not work as I would like

I'm working ik, and I try to put them a pole targ but this one does not work like I want. I'm using the pole targ to simulate the elbow but as you can see in the picture this nose bends like a piece ...