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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32 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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16 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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9 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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16 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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13 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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12 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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14 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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16 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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8 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
81 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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12 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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21 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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46 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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31 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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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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22 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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11 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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15 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
44 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
47 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
18 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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1answer
62 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
19 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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34 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
30 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
19 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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1answer
61 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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12 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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34 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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41 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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23 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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1answer
12 views

IK not moving correctly

I'm having an issue with IK, despite it always working fine previously. I've set up an IK on the lower leg bone as shown below. The IK target is the bone opposite the foot, and the IK pole target is ...
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46 views

Why can't i turn on inverse kinematics with rigify

I got a rigged 3d model and for some reason when I try to turn on inverse kinematics an error pops up saying ...
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0answers
29 views

Blender for online human-movement visualization

I would like to know if I can use Blender to visualize human motion in an online manner. In my setup, I will have motion capture system which will provide the position of some arbitrary marker (...
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1answer
32 views

IK Bone setup , pole bones targets the bone wrong direction

Hey guys I have imported a character from CC and I tried to add IK bones. After added the pole bones I have a issue something like that . I feel like it cause of bone rotations but I could not fix ...
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1answer
95 views

I just cant find IK (Inverse Kinematics tab in toolbar)

I just cant locate the IK (Inverse Kinematics) in bone constraint tab?
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1answer
18 views

NOOB: What method for constraining?

I am new to Blender. I have made strides learning modeling and material creation, but now looking to take my modeling a little further. I want to be able to create a complex model with multiple ...
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1answer
38 views

Inverse Kinematics locks ignored

Here is a very simple leg. Leg.lower.L has an ik constraint applied, of chain length 2. Foot.L has no ik applied but copies its rotation from IK_Foot.L As discussed here here this enables the ...
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1answer
111 views

How to limit rotation on the last bone of an ik chain

The last bone here, Bone7, has an ik constraint of chain length 3. As in the image, moving ikBone moves the bones all the way back to bone4. This makes me think that the length of a chain doesn't ...
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1answer
35 views

Can I limit what IK bends? Need bones to only move certain way

I was working with a model of a robot arm type thing, and wanted to use an IK constraint with an empty as the target to assist in posing. I abandoned the idea because: The IK constraint seems to run ...
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0answers
33 views

Pole target prevent IK restraints

I'm trying to rig a character and I encountered a rather annoying problem: I followed tutorials to create IK and pole targets etc And it work fine, except: if I use pole target the IK constraints will ...
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6 views

IK Bone locks even when Rotation Constraint set to 360d

The thigh bone of the character has to be rotated in the forward direction , beyond the extent shown below. There are no limit constraints on the bones. But it locks even when the IK rotation ...
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30 views

IK rigging not working

In the file here attached i can't seem to get the IK working - the legs jump all over the place and the arms rotate weirdly when i select the pole target and i can't change the Pole angle so that the ...
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2answers
54 views

Issue with IK armature messing up when I try to shrink my model

Hi there I'm starting out and just finished making my first model that has a IK to FK switch, but I only realized afterwords it was way bigger than I'd have liked, so I went to scale it and this ...
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1answer
113 views

How to prevent Parent bone rotates the child bone in pose mode in Blender 2.8?

As you can see in the figure 1 , I have one child bone connected to the parent , Although I locked all the rotation axis(fig 1) and applied limit rotation constraint to the child bone; when I move ...
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1answer
22 views

Bones are not bending as intended

First of all, I am pretty new to all of this but wanted to try it, so I followed a tutorial from Youtube by Sabastian Lague. Although it was posted in 2016 and pretty much was changed, I tried to ...
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1answer
12 views

Why has IK rotation constraint “envelope” stopped displaying?

Uptil yesterday,for the same Ik rig, IK rotation constraint "envelopes"(red line) were being displayed. However today,with multidimensional constraints they no longer show. Is there an ...
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124 views

How to avoid bone roll on “Rotation Constrained” IK bone?

For 2d cutout animation sidefacing rig (XZ plane), movement and rotation in Y axis is restricted with constraints.However even after applying IK constraints to the IK chain and location constraints to ...

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