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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750 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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0answers
36 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
40 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
44 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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0answers
9 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
13 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
18 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
41 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
24 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
54 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
30 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
77 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
34 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
32 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
38 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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0answers
33 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
52 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
57 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
362 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
193 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
29 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
21 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
39 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
50 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
81 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
23 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
82 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
72 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
125 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
18 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
1k 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
148 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
207 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
80 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
33 views

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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0answers
38 views

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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0answers
27 views

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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0answers
28 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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1answer
106 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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0answers
49 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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1answer
34 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
34 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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1answer
235 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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0answers
262 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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1answer
1k views

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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1answer
32 views

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 ...