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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1answer
17 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
47 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
30 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
12 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
27 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
18 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
46 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
9 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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0answers
20 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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0answers
12 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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0answers
28 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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0answers
14 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
815 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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50 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
60 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
69 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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10 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
20 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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0answers
14 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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0answers
25 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
24 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
42 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
48 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
34 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
59 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
41 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
90 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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0answers
50 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
37 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
54 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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35 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
65 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
62 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
606 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
263 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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0answers
36 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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0answers
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
41 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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0answers
55 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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0answers
115 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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0answers
25 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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1answer
111 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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1answer
115 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
152 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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0answers
24 views

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
2k 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
185 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
260 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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1answer
33 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
100 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: