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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35 views

How to make shoulder bend properly?

I'm trying to make my shoulder bend properly and so far it looks like this: but when I try to move my hand it looks like this: I was wondering if there was a way I could limit the rotation around ...
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23 views

Rigid body with an armature on a complex model

I am trying to make a human character which would behave like a rigid body, ie. fall down to the ground and deform. I tried to follow this process which involves creating empties and parenting them to ...
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Two issues with pose mode - Can't apply pose as rest pose - IK Bone doesn't keep its connection to the controller

I am having a rather unusual issue with pose-mode in blender. Everytime I apply the pose as rest pose, the armature moves out of its position. Also - edit mode does not "accept" that new ...
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1answer
14 views

Specifically control IK behaviour

I tryed to rig the landing legs of a spaceship. So I can animate them retracting. But when I try to retract them the IK bends the objects into the spaceship, instead of bending them up. Is there a way ...
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1answer
29 views

why are rigify's IK pole targets Hidden in pose mode

I have a character parented to a rigify Armature. I want to stop my character from contorting (e.g., elbow twisted into torso area) as I set the Hand_IK. I would assume that I could use the IK pole ...
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22 views

How do I get rigify arm IK bones to no longer aim toward origin?

I am modeling a tennis player with rigify. I have created several actions (forehand, backhand, etc), all of which work when tested alone. I did them at the origin of the scene. My problem is, when ...
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34 views

How do I fix this jittery IK rig (No dependency cycles detected)

I am trying to make a mechanical arm for a humanoid, but the elbow joint needs to be double jointed so it can flex correctly. I have figured out how to make the joint flex evenly on both ends, however;...
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1answer
12 views

Inverse Kinematics Chain Length Goes Down Wrong Branch

Trying to follow CG Geek's tutorial for making a tree rigged with inverse kinematics, however when I increase the chain length instead of progressing towards the trunk it instead goes back up a ...
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25 views

Rigging Artifacts

I'm playing around with Kinect mocap, I'm completely new to rigging. To get my feet wet, I'm using the resources here. I'm trying to apply the animations from the female base model to the male one. It ...
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2answers
34 views

How to prevent legs (objects ) from clipping into each other, when moving the armature

I'm a long-time reader and asking for the first time. Fairly new to blender with no prior schooling in 3D, I would like to rig an armature to a human skeleton. However, my knee joint (consisting of 3 ...
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24 views

Rotating leg bones twists the leg

when I rotate the legs, it twists in a really weird way and I want to fix it. I don't know if this is an IK problem as I am not an expert with Inverse Kinematics, but if anyone of you know how to fix ...
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51 views

Export equipable armor parts for unity

I'm new to blender and 3D modeling, I want to export armors as parts like upper body boots, gloves, so on.. and I want to be able equip and unequip in unity game, problem is bone weights are not ...
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1answer
28 views

Ik moving a leg in the wrong direction

i am trying to rig a leg, but while it works ok-ish when moving forward, it bends in a way that it is not supposed to backwards In both times i tried using shift+X to not move in the x axis, but the ...
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1answer
27 views

Leg glitching after adding IK constraint

I figured out the problem to my last question with the help of someone else and I successfully changed the bones from FK to IK. But now that it’s working, the leg glitches at some parts when I ...
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1answer
31 views

Visual Keying not Properly Recording IK When Baking Animation

While animating something recently, I've come across something I've never seen before. I had just finished the following animation, and since I had used the spring bones plugin to simulate the hat ...
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17 views

Hip deformation with heel IK bone

I'm trying to learn how to implement IK bones in my rig. I followed a quick YouTube tutorial. However, when I move the IK heel bone, the mesh deforms badly at the hip area. Is this because I haven't ...
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1answer
34 views

How do you move the last bone with IK without it rotating?

I have a line of 3 bones, and I want to be able to move the last bone, without it rotating, but I also want to be able to manually rotate it outside of IK. How do I do this? I want to be able to move ...
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1answer
51 views

Rigging a mechanical plunger: bone constraints lead to offset results

I have a model for a soccer robot which has a "leg" that can be used to shoot a ball. It is capable of shooting from a low and high position, allowing the ball to be shot through the air or ...
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1answer
57 views

How do you rotate an entire rig without bending bones controlled by IK pole?

I'm trying to take my entire rig by the root bone and rotate it while preserving all of its other bones' positions/sizes/rotations. It all works, except for the arms which start bending all over the ...
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12 views

Guidance requested for automating ik control bone movement and addition to poselib

I am attempting to automate the creation of an array of poses (as a poselib) for a mechanical system in Python, based on known scene geometry. I have a rigged armature that works well having ...
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1answer
53 views

How do I convert this FK leg to IK without getting rid of animation

I have this character here that has motion capture on him but I want the legs to be put into IK instead of using FK without getting rid of the motion capture I got from Mixamo. I've tried "baking&...
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1answer
30 views

Inverse kinematics acting weird

I added a rig with both forward and inverse kinematics but whenever I move the right hand then for some reason the left arm moves in a weird way, same withe the feet. I have already checked and every ...
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1answer
28 views

Armature bone rotation values not changing when using inverse kinematics

I'm trying to have drivers activate based on certain bone rotation values. However when the bones are moved as a result of the IK setup their rotation values do not change at all. Edit: File ...
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1answer
24 views

IK constraint not working

This is the robot rig that I am working on. I duplicated the left leg to make an FK IK switch. But the IK is not working on the "Third leg part L.002". I tried to move the IK control bone, ...
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2answers
32 views

Sequence of Bones rotate One by One - Controlled by One Bone

I want to create an armature that has several bones that are all controlled by one bone. When that one bone is rotated, it will rotate all of the bones, but one at a time. So when one bone has ...
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1answer
11 views

Armature IK Causing Heavy Distortion

I've been trying to figure what's wrong with what I'm doing for a long time now. The IK moves how I want it to, but...you can see what happens with the attached image. .blend file: file
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17 views

Foot IK rig glitching

I'm working on a foot rig, following exactly what Royal Skies shows on YouTube. (Link: https://www.youtube.com/watch?v=voYM3yyeZP4&list=PLZpDYt0cyiusytIPAOTPRzsa4GK6LgY3_&index=4) Everything ...
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13 views

IK hand rotates strange when trying to match it to weapon

I have a problem with ik hand rotation. I am trying to match hand bone with AK bone, but i have strange effect. How can i fix it? I'm new in Blender))
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34 views

Mesh Crumples at Elbow When Arm is Rotated

When I rotate my characters arm so that both the upper and lower arm are facing down, the mesh at the arm moves around like it is crumpled. I do not believe this is a problem with the weight paint, ...
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1answer
39 views

Clearing Transforms Doesn't Make Rest Pose (IK problem?)

I have a problem where my pose position and my Rest Pose position are not the same, even when I have cleared all transforms for the pose position. It has something to do with the IK bones - perhaps ...
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1answer
22 views

Base Mesh changes back to its original form after switching to object mode

I downloaded the free RoyalSkies Male Rig from his website just to play around. I made the character less buffed up with proportional editing but it reverts back to its original form after switching ...
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1answer
36 views

How do I link multiple meshes to one armature and apply Inverse Kinematics without distorting mesh?

I’m trying to to rig and animate a set of meshes that are 3d scans of a horse’s leg bones. Each bone is a separate mesh. I only need the bones to rotate on one axis (y-axis in the screenshot) and move ...
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7 views

Inverse Kinematics Small Issue

Any recommendations to keep the bendy bones from snapping like that when moving the IK Target (red bone) up and down?
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1answer
28 views

Problem with armature with automatic weight

I am relatively new to blender and was following this YT tutorial, everything was going well and my IK were working on the bones, but, when I tried to parent the bones to the mesh everything went ...
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19 views

blender 2.91.2 ik stretch is unlimited

the chain length is 2, it affects bone.001 and bone.005, the target bone is bone.003 and the pole bone is bone.004 i set the ik stretch of bone.005 to 0.001 and locked it's scaling of x axis and z ...
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80 views

Accessing Inverse Kinematics from python

I searched a lot about blender's Inverse Kinematics API, but I'm really confused right now. So the goal of my project is to control a robot arm that has 4 degrees of freedom. So far, I managed to ...
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19 views

IK/Spline IK Armature Controllers binding to respective bone

I've created a rig with IK Controllers for the hands/feet and a Spline IK system for the tail, both of which work rather well for my purposes. However, I want to improve their functionality by ...
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1answer
50 views

IK rigging with a hammer held in hand

I'm having trouble getting an IK rig to work how I want it to. My goal is to have a hammer in my characters arm that I can move and rotate have the arm and hand rotate properly like it would for a ...
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22 views

How to reflect my rig across the x and y-axis so it matches the Kinect rig?

I have been following a these tutorials: https://www.youtube.com/watch?v=Fs_pJ7_1W58 and I thought I did this correctly but the my rig is an almost exact reflection of the Kinect rig from the y and x-...
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25 views

Ik bone constraints servo motor

I am trying to simulate the following mechanics using ik bones but didn't manage to find a solution. Any help would be greatly appreciated :-) Also happy if anyone as a good tutorial to point me to! ...
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22 views

How to keep the end bone of the rig straight? What would be the right way to do it?

I have this rig that I made. I was thinking that I could use some kind of IK system to make it easier to animate. But I have a problem with it. Either I'm not creating a proper IK system, or there is ...
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0answers
18 views

Having trouble with the space settings on copy location bone constraint

So I used to know how to set up the copy location constraint so the bone using it would move when the target moved relative to its own location, but could still move in t's own space. Now I'm trying ...
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1answer
77 views

Shape key driver not working with IK bones

Blender version 2.79: I configured a shape key driver for when the leg rotates in X, to repair the "shoulders", but the problem is that the repair shape key shows all the time, even when the ...
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1answer
80 views

How to fix clipping knee joint with ik bones?

I created a quadruped character, and added ik bones to the legs, but the problem is the knees start clipping when it bends. i tried to see if changing the weight paint would help, but it just got ...
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1answer
102 views

How to switch between fk and ik when they are separate armatures?

I have a model that I want to be able to switch between IK and FK. The ik and fk bones are two separate armatures but connected through bone constraints. How would I be able to switch between FK and ...
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1answer
26 views

IK claw control with driver / controller

I was doing a claw rigging and in-order to perform the claw to open and closing action I want to implement a driver or an object which will provide its translation data along the z-axis, unfortunately,...
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1answer
65 views

inverse kinematics with bone constraints only work, if i stop cursor movement and release mouse button

Is it normal, that my inverse kinematics movement which is restricted by a bone constraint only works, if i release the mouse button? e.g. -> movement restricted to x rotation. I can move with IK ...
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33 views

IK not smooth - snapping

I have rigged a low-poly block character so that it has an IK armature. The problem is that when I try to animate it, when the legs get close to extending straight, the leg will be moving smoothly, ...
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40 views

iTaSC solver in "simulation mode" - Fine in viewport but false in renders

To avoid IK flipping problems I use the iTaSC solver in "simulation mode". When I set the iTaSC IK solver in "simulation mode", the simulation is running very well in the viewport :...
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16 views

Control Bone Has No Fixed Position

I have this rig set up with a IK constraint that has one bone that acts as the control for the leg armature (Labeled in Screenshot). I have been following a tutorial, and it shows me how to rig it, ...

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