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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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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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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21 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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11 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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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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The bending direction of IK constraints

I modeled the octopus and I am working on rigging. I applied IK constraints to the legs and the direction in which they bend is as shown in the GIF. This is generally good. However, my octopus ...
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1answer
45 views

Why won't the arms move with my bones?

I am learning rigging in blender so I made this: The bones work fine with everything except for the upper arm on both arms. Take a look here: Here is my rig:
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13 views

IK Arm rotates in wrong direction

After having done my IK rig, I notice that moving my arm control bone moves it in the wrong direction. I am not able to put my arm in the correct way. How I want to pose my arm (sorry, best photo I ...
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How do I fix jutting of bones once ik is added

AS i move the wrist bone, the whole armature rotates uncontrollably. Im sorry if the picture isnt very clear. just imagine the armature wierdly jutting about as I move the wrist bone. Thank you
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FBX Exports IK bone with wrong position, rotation and scale

I have a rigged and animated model with IK bones attached behind the feet. I've exported the model to FBX with the following settings: 4 out of 5 animations seem to export properly, but in one of the ...
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Need help with this mechanism

I’m trying to animate an umbrella designed by me, whose opening is based on a system of pulling wires. The bone called “Molletta_F_SX” has an IK constraint and, during the entire animation, it should ...
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Why doesn't Auto-IK work for “ Crouch ” Action? (Override Cyclic Dependency)

While implementing "Crouch" action , the model/armature crouches fine when used with "IK Bone Constraint" applied to relevant bones , but when crouch action is tried on the same ...
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How to import data in IK

I've been using blender for a few months. I made an IK (Inverse Kinematics) model and have 3D position data of hands. What I've been doing was manually typing in the x, y, z coordinates in each frame ...
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Help regarding stretching and bending animations

I'm new to game development and for a few weeks I've been trying to accomplish something and I'm getting nowhere. I'm working on a game where the player controls a slime (looks like a hemisphere when ...
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Rigify mixing bones between DEF and ORG hierachies

I'm building a custom Rigify metarig with a spines.super_head. The final head bone has a number of (disconnected) child bones for the beak (which are a limbs.simple_tentacle), but once generated the ...
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1answer
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Bone snapping to control bone while making an Inverse Kinematic Rig

Good evening. I have made a humanoid rig and wish to add an IK Controller to the bone "UpperArm.R". I wish to make the bone "CTRL_1.R" bone as a controller bone. Whenever I do so, ...
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Parenting arm twist bones to forearm bone

I created separate bones for animating twist of the arm muscles and applied a copy rotation constraint based on the wrist bone. (Y axis only, local space to local space, mix=replace): I had to ...
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armature relation off center

I have parented a grease pencil drawing to a bone and when I try rotating the bone they don't rotate around the same path. What am I missing? This has worked for me once but then it never worked again ...
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Inverse Kinematics Issue

I am fairly new at using Blender and I am currently trying to learn how to rig my modeled guy I downloaded off the internet. I was able to rig my guy's leg and is moving smoothly, but when I tried to ...
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1answer
19 views

How To: 1 Bone Moves Entire Arm, While IK Bones Can Bend Arm

I am trying to make a very simple character who has two IK bones in his arm (Besides Target and Pole) to move and bend it. At the moment I am to move his arm, bending it "realistically". However, I ...
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Is there a way to set triggers for IK to pull other bones?

My plan is when I pull my arm far enough forwards it starts pulling on a different bone or IK? I'm using it to pull an Ik Handle to pull the arm to pull the shoulders pull handle forwards. I hope to ...
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1answer
60 views

How can I make an object's tip position exactly where the IK controller bone is?

So I have this robot leg I made. This is the current setup I have The selected bone is the IK controller bone. When I tried to move the IK bone to the 3D cursor in edit mode I get this. So as a work ...
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17 views

Is there a way to make inverse kinematics target anywhere on a path or surface instead of just a point?

I'm trying to make an animation of someone playing the piano (as automatically as possible using the MIDI). It would be nice if I could make them hit somewhere on the key instead of having to specify ...
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1answer
23 views

Can you rotate bones within an IK Chain and allow the IK Target bone to move along with it?

I have a robot arm rigged with an IK and down the chain of the IK there is a joint specifically for rotating on the bone's Y Axis that allows the entire lower arm to rotate. However once I move the ...
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Rigging: leg IK is behaving wierd. Clothes are tearing

For some reason, My Leg IK is not behaving properly. Clothes are tearing apart on bending the leg. I following this tutorial for LegIK and setup pole target.
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1answer
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How to Avoid/Correct Circular Dependencies on IK Rigs with Drivers?

In reference to this report on mis-behaving IK rigs-- https://developer.blender.org/T76158 The answer is, IK rigs with dependency cycles have undefined (glitchy) behavior. My follow up questions are: ...
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27 views

newbie question: Move several bones with one control

So i have a humanoid rig and i want it to only do one thing - open and close arms as if hugging someone. I want to have a single control (with one degree of freedom) that moves all the bones ...
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15 views

How to make IK target bone undetachable?

So I have a arm, and a IK. The target bone of the IK is called wrist. My goal is to make the wrist bone undetachable from the IK bone. This is what I don't want. The wrist bone (purple one, is ...
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1answer
28 views

Character model going crazy after parenting

For this first post, I wand to detail a weird issue for my character model. I am new to IK rigs, and I just finished my character. The armature has absolutely no problem. After having parented the ...
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1answer
21 views

Bone rigging incorrectly

I am making a rigged character. When the wrist is lifted up, the whole arm should move, and the torso should not. The correct 'connecting line' from the wrist to the collarbone (may be hard to see, ...
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16 views

The rig rotates automatically when the desired pole target is set in Inverse kinematics

I was rigging my character seeing the tutorial by CG Geek https://youtu.be/SBYb1YmaOMY?t=450. The same process was done but my rig rotates out of model
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Is it possible to add IK's to a pre-existing rigs?

Im trying to add IK' to this model's pre-existing rig, but have no idea how exactly todo it In this case. Is it even possible? This is the file:
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Pole target drags behind IK

I'm learning how to rig and one of the problems I have is trying to have the pole target bone move with the leg to keep the direction it's pointing at the same. I know I could parent the pole to the ...
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25 views

Shoulder rigging, collar bone not following bicep bone

I am new to rigging, wanted to rig a model myself with IK etc, so that I can pose it and so on. There is a tutorial I tried to follow but it just does not work like the guy is explaining. Basically I ...
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Change influence of IK?

If I have bones in an IK, like from a hand to a shoulder, I want the bones in the arm to rotate as usual, but I want the bones in the shoulder to move much less in response, but not none at all. In ...
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IK bone for arm animation issues

I am having an issue with a 1 chain-length IK setup where the limit distance constraint on the IK bone does not actually work. Visually it works, however the animation is still acting as if the bone ...
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1answer
31 views

How to mimic IK to move a bone using Python without actually setting up IK?

Using Python in the script editor, I am currently moving my skeleton using motion capture data. For times when the data jumps to an inaccurate place or when there are gaps in the data, I want to use ...
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1answer
31 views

Is it possible to combine spline IK for the body and regular IK for limbs?

I've got a centipede model with an IK rig. I would like the spine to move along the spline curve in the background, following its curvature, while still letting me pose the legs like normal to make ...
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2answers
42 views

Sequenced Bone Movement with IK

yet another IK question.... I'm working on an animation project where I have an accordion wall segment that needs to extend outwards, one fold at a time. When I create the the IK bone setup and pull ...
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Python API: How to export bone angles in real-time?

Attached is a screenshot of a simple IK armature. Is there a way to export the bone rotations (in radians or degrees) into the terminal window (as a plaintext) in real time? As in: "When I move the ...
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My IK rig won't flip properly

i'm having problems with my IK rig. I'm working on a generic character model rig with multiple animations. One of these animations is a walk cycle and a practice that a lot of people implement is the ...
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1answer
99 views

Force IK rig to bend knee “Wrong” way?

I've designed this mech's legs so they can fold up when crouched but that left the knee pivot behind the top one so my IK rig bends my leg the wrong way. Can I have my knee behind the "pelvis" and ...
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IK Foot moving after enabling rotation

I'm trying to give my rig an IK for the foot, but whenever I enable the rotation tickbox on the IK bone options, the foot snaps to a complete different place. Is there anyway to prevent the foot ...
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25 views

Model breaks when animating

I use blender 2.8 and animated using armature, bones and inverse-kinnematics and applied auto weigths. I Followed these tutorials to do it: Youtube tutorial by Royal Skies LLC The armature animation ...
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Animating tentacles

I'm doing some tests for a character for a videogame I'm making. The body is straight from MakeHumans, I imported it with the rig because it would save me the pain of rigging the character myself (...
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1answer
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IK Legs Mess Up in Render

I have created an animation with this robot, and everything looks fine and normal in the viewport, but once I render it out in any render engine it does this weird thing that you see in the first ...
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Does the iTaSC IK Solver Turn off the FK Rig?

i put some iTaSC IK constraints on my rig, and have been using them to animate. however, i turned the IK constraints OFF to pose the fk rig... and my fk bones will NOT move. is this a side effect of ...
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Bone chain with IK bends uncontrllably/randomly when I move it's helper bone

I'm trying to follow this yt tutorial on inverse kinematics https://www.youtube.com/watch?v=Pt3-mHBCoQk ...but I can't seem to be able to move the bones in a single plane like in the video, my rig ...
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31 views

2.79 FK to IK Rig and Drivers, Why are they Conflicting?

blender 2.79 i'm not real versed in this, but i was following this tutorial: https://www.youtube.com/watch?v=r-G3ocQ5cjg basically, the pose bones follow the ik chain bones when the ik switch is on. ...
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Auto Key does not Key limbs that are moved with FK_IK Snapping Rigify

I am using a rigify rig. I have auto key on. After creating an animation using IK, I want to snap the FK limbs to the animated IK limbs. Auto Key does not record the new position of FK limbs once they ...

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