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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46 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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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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35 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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68 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
29 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
51 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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25 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
28 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
23 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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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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1answer
21 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
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 ...
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1answer
87 views

Automatic Forearm twist?

I'm trying to setup a rig that allows IK/FK (via influence property), where the forearm twist joint automatically alleviates part of the twist of the hand. Not necessarily as part of the IK - just ...
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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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1answer
42 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
24 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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2answers
62 views

I can't understand Inverse Kinematics

So I am relatively new to Blender, and while figuring out the process that is rigging, and applying Inverse Kinematics to my armature, I came into contact with a weird problem, Normally, inverse ...
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1answer
17 views

Using Inverse Kinematics and/or Pole Targets to move hair bones in unison?

I have a model whose hair is composed of several strands that I have each connected to a bone as part of the whole armature. What I want is for each "hair bone" to rotate at the tail in correspondence ...
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24 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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18 views

Floor constraint makes armature move floor

I have a model with an armature, with IK legs, that I want to animate. Before I begin animating, I would first like to constrain it to a rooms boundaries, specifically the floor. When I set up the "...
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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 ...
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15 views

Bizarre animation issue after fbx export -What am I doing wrong?

I seem to have run into an issue with my animation that I simply can't wrap my head around. My fairly simple run animation looks fine while it plays in the original blender file, but as soon as I ...
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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 ...
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62 views

How to fix leg IK rotating foot bone?

I'm rigging a model using IK for legs and arms and initially I set up the IK while the bone roll for the leg and arm bones wasn't 0. After going back to fix the bone roll and redoing the IK, I now ...
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1answer
70 views

IK Rotation option for opposite end

I have a string of bones with an IK constraint at the end that uses most, but not all, of the bones. When the target is brought back, the first bone bends greatly away from the bone before it, and the ...
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1answer
82 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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12 views

Why does Mirroring Leg IK in One Frame Mess Up All Other Frames?

i have had instances where copying/pasting/mirroring an ik control have caused weirdness in other frames of animation, but usually, just moving the scrubber one frame then back, or by switching ...
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1answer
22 views

Switching a bone's head and tail

I was trying to set up IK on a model I'm using for animation, when I noticed the foot was trying to bend the hip rather than the knee: I think this is because the thigh bone is facing the wrong way (...
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16 views

IK leg acts as FK when Torso is transformed on the z axis

I found the following rig the Blend file on sketchfab and tweaked while following DanPro advanced rigging tutorials. Then I noted that I have a strange issue with the rig, and I'm curious as for ...
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31 views

How to add inverse kinematics onto rigify rig add-on?

So I know how to make a human meta rig using the rigify add-on (the one that comes included in 2.79). I also know how to add additional bones onto the rig, I can do all that stuff successfully, ...
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1answer
25 views

How to limit the rotation of a bone in an FK chain?

Im using metarig to rig a model of a robot and the arms and legs have brackets connecting the joints where rotation in a certain axis would cause part of the model to twist into the mesh of the ...
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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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1answer
106 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
36 views

Ik rig severely deforms, target pole rotates torso?

For some reason my rig's targer pole isn't working properly. I was trying to practice rigging poses by using an image as reference, but I didn't know why my pose was limited and it wasn't deforming ...
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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 ...
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1answer
63 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
106 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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62 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
43 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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0answers
60 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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40 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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1answer
79 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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1answer
70 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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1answer
953 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
328 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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49 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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25 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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1answer
43 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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74 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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130 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 ...