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 views

Knee vertices not following Foot IK. Seem locked in place

I'm trying to make the knee and hip joints respond to the footIK but the knee vertices seem stuck in place. Probably an easy problem, but I'm new to blender. Any help much appreciated!!! Thank you
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1k 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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48 views

inverse kinematic animation alignement of mouvement issue

I have rigged this elephant mesh with inverse kinematic but when I move the leg with the controler bone, the leg bend inward (my goal is to have a leg that bend along the Y axis). Here are picture to ...
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87 views

Deform bone will not follow IK bone perfectly with copy rotation

I am trying to separate bone layers with ik fk central and deform layers. I am having problem with copy rotation from IK>central>def bones (each in different layers.) The deform bone will not follow ...
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1answer
85 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:...
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1answer
423 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 ...
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1answer
641 views

Bone constraint rotation not working correctly

I am following a skeleton rig tutorial on youtube step by step and despite having the exact same setup, my armature behaves incorrectly. https://youtu.be/jp_SqjB0468?t=920 at minute 15:40. This is the ...
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180 views

Torus animation rig

I am trying to deal with Blender's IK solving system (though maybe I don't need it at all?). I need to animate torus into a smile-like figure (upside- and downside-"smile" animation will be for the ...
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44 views

How to Rig This

I have this Bone Rig that I don't know how to rig. Think of it like a dog ear. Here's a picture. I'm trying to figure out how to rig it so that the bones on the right side are the control bones. ...
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1answer
33 views

Finger Isn't Flexing

OK, I am new to rigging, so hopefully this is an easy question to answer. I've got a finger rig, which I made by following a book, to be specific, the Second Edition of Oliver Villar's book, Learning ...
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1answer
30 views

Wacky IK arm Movement

I have an arm rig shown below. C stands for control, and D stands for deform. I'm having a problem where when I try to move C_Hand in order to move the forearm, it does move, but it spins around ...
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31 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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1answer
63 views

Heel bone twists strangely under rotation, need to resolve in order to progress

I have about 13 animations already made for an armature and now I am getting a very alarming, unexpected result that I need help identifying the cause of and fixing: When I try to rotate the entire ...
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1answer
77 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 ...
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274 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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1answer
98 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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67 views

How to make ik target overlap with its constrained bone's location

I know that the general practice when creating an ik rig for say a leg, you constrain lower leg bone to ik target and create a copy rotation constraint from the ik target to the foot. Now I would ...
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33 views

Having trouble Parenting a Bezier curve

So I am working on a mesh of a character with a tail. I used a Bezier curve to IK that but I'm having trouble. Everything is fine until I try to parent the curve to the armature in some what either ...
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76 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 ...
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849 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 ...
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1answer
182 views

What is the recommended angle to set the Pole angle to when setting up an IK rig?

Is there a specific or recommended degree to set the pole angle at when setting up an IK? I've read that 90 or 180/-90 or -180 are good degrees to set it to, but does it matter? Can any degree be ...
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1answer
275 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
523 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
742 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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1answer
152 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
779 views

Bones rotate instead of moving

I have a human rig with an IK on the leg. When I try to move the knee separately in pose mode the leg doesn't move. The knee has the cursor as if it was going to rotate and the text at the bottom says ...
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1answer
216 views

IK rig breaks when I add a pole target

I've been trying to do rigging recently, and when I add a pole target to my IK rig, my character's foot just slides up and down the leg, which remains stiff. I've had this problem for a while and I ...
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1answer
126 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 ...
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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, ...
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145 views

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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1answer
94 views

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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119 views

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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1answer
102 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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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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3k 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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1answer
49 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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145 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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1answer
355 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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2answers
218 views

some vertices don't follow bone chain with Spline IK

I have made a complex ribbon-like structure (DNA strand), rigged it with bendy bones and made it follow an Archimedic spiral. In one strand, this worked perfectly (1st image), in the other some ...
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1answer
484 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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1answer
433 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 ...
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1answer
666 views

Is my Inverse Kinematics not working correctly or is it working correctly?

Here is how it looks like when it is on the ground. Here is how it looks like when I move the bone up along the z axis. As you can notice the yellow bone moves to the right a little. How do I fix ...
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1answer
449 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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2answers
3k 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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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?
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1answer
42 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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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
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1answer
199 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 ...
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1answer
318 views

Spline IK bake and export problem

I’m having some trouble with SplineIK. I made a rope with bones, animated on a curve. I used spline IK and at the end I baked it before exporting. Everything works well in Blender before exporting, ...
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1answer
257 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 ...