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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11 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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18 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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23 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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57 views

Rigify elbow/knee joint clipping issue

I recently made a rigify armature for a model and am having some issues with the arms and legs. The issue is that when I move the arms and legs in pose mode, the mesh deforms weirdly at the elbow and ...
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1answer
17 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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17 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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26 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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11 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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32 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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12 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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38 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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18 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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18 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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13 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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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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35 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
44 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
40 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
19 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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27 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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16 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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21 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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20 views

Bone IK Constraints - Bone Transformation Data

I create animations on Blender and export the keyframes using custom plugin to be used in others appliances. In order to run the animation on other programs, the transformation data recorded on the ...
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10 views

Parenting spine bones with an IK inside - dependency loop issue

TL;DR How can I get around the dependency loop between parented bones with an IK in between, without having to delete the IK element? The rig should be switched between IK and FK by changing the ...
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1answer
85 views

Adding IK Problems - shin/forearm sticks out, doesn't follow IK

I'm trying to create an IK for a model, and have tried both of the following tutorials: Blender and Royal Skies LLC. The process I'm following, and the issue I get both times, are both shown in this ...
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13 views

My character is rigged and armature works well except its unstable

Some bones occasionally move in directions (basically middle spine bone out of three spine bones(pelvis included) which has IK applied) and it is different or not happening every time I view it, it ...
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19 views

How To Create An Ik Rig With A Boneset That Isn't Connected

I'm trying to create a simple IK rig to make animating for games easier. However due to the bone rotations and it not being connected I encounter issues forcing me to animate in FK. I found a thread, ...
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27 views

Recalculate kinematics to avoid collisions with bones

I've a very simple question but I haven't found the solution anywhere. Let's see if you guys can give me a hand :slight_smile: I would like to know if in blender it's possible to avoid collisions (for ...
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1answer
107 views

Bone Turns Orange And Auto IK Doesn't Work

The model's left leg is perfectly fine. I can select the lower leg and with G, move the leg with auto IK. For some reason, when moving any bone on the body, the right leg's upper bone turns orange. ...
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36 views

Noob Question: Inverse Kinematics Not Working

I have tried adding Inverse Kinematics to the legs of my humanoid model using this tutorial: https://www.youtube.com/watch?v=jp_SqjB0468 However, when I move the IK bone, the leg won't bend at the ...
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7 views

Can the bone's locrot be made the same after changing form IK to FK?

I have a human rig that can be switched from IK to FK vice versa. But after IK to FK switching, the affected bone's locrot influenced by IK constraint, wont hold the current locrot. Is there a way to ...
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29 views

Using corrective shapekeys with a IK rig

I have a character rigged with AutoRig Pro and I am using IK on the rig, but corrective shapekeys are not working unless I use FK. Is there a trick to using IK with corrective shapekeys?
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33 views

IK Solver Chain Length reverts back to 0 when changing between pose and object mode

So I've been working on rigging a model for animation and I've set up IK chain links between a few different body parts. For some reason, the left leg of my character model won't maintain it's IK ...
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22 views

How to apply FK/IK for certain keyframes?

I'm animating a charracter and need him to switch between IK and FK controls for a certain action, but there's no way to set that afaik. If you set it at IK, the entire animation for that body part ...
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1answer
57 views

Animation issue in “Sniper Gun Reload”

i am animating the one of the sniper gun "AWP SNIPER GUN" but the issue is that the reload has to be done with the right hand ,the right hand is attached to the gun means where the right ...
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1answer
112 views

How to remove IK Target after a certain point without breaking the animation?

I'm creating a siting animation for a dog, I used a IK target to lock his his right leg to a specific location when i was animating his left leg. everything is fine and animation is going how I want ...
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1answer
28 views

Problem : Character fbx export has weird animation becaus of IK

I made a character in blender and add few actions to that. Also i used IK for legs and every thing is okay in blender viewport and animations work well. But when i export it as *fbx , it’s legs ...
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100 views

Rigging two-handed weapon in Blender 2.8

I'm having trouble with rigging a two-handed weapon in Blender 2.82. Basically, I want to achieve this: Such gif was retrieved from a previous questions and answer, but the solution applied for a ...
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1answer
35 views

Blender IK doesn't bend knee

https://youtu.be/5HBzaBwuUoA In my rig, I have the IK constraint between the shin, the heel, and the knee, but the leg doesn't bend the way I want it to, any help?
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1answer
38 views

Animation baking error

To showcase the problem the easiest way, this is what the issue looks like: https://youtu.be/esihE0ob7U8 As you can see, the track chain makes a momentary 'jump' when the baked animation is played ...
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1answer
40 views

Finger IK/FK not working properly

I am trying to rig my character for animation but I can not figure out why my fingers aren't moving properly. They bend and twist unnaturally. I have weight painted the mesh, but I still can't get the ...
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1answer
20 views

Twisted IK handles. mesh is twisted. what am I doing wrong?

it is my first time really using blender to make a rigged 3D humanoid with IK handles. for some reason, my model is very twisted and contorted after applying automatic weights. and I've been unable to ...
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70 views

Rigging technique for flexible cardboard packaging

I am trying to mockup a packaging project of mine which looks something like this: When the package is closed a little basket is enclosed by two outer cardboard flaps that come down to the sides when ...
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13 views

IK not bending arms

I was almost done and everything worked fine and then, i try to bend my arm with the ik and it doesnt. It does move with it tho and it was working before so I don't understand whats happening. Any ...
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37 views

Make the pose position equal to the rest position

I want my rest position to be my pose position (make pose position = rest position), because the when I duplicaed one side of my armature to make the right side, one of the arm got flipped and its ...
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74 views

How do I make Hinge Joints, like an elbow or knee, restricted in rotation, but have IK?

I'm fairly new to animating in Blender, so I figured it was about time I learn more about constraints and switching between IK and FK. I just recently figured out how to switch between IK and FK, and ...
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30 views

IK rig going incredibly wrong

Whenever i edit my rig the ik goes rogue ,this problem is very prolonged , i am having this for long time, for example following are the two pictures of the rig in the edit mode , before editing and ...
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44 views

Rigify IK to FK Snap, IK loses Twist

i'm using a superlimb: paw for the foreleg of this horse. i have created a lying down pose with the FK rig. i snapped the IK rig to it, and that worked fine. however, when i switch from FK to IK... ...

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