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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70 views

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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1k views

Creating a generic IK/FK snap script

I've tried deconstructing the Rigify addon to isolate the script part that handles IK/FK snapping, but so far I've had no luck. Rigify is a very nice tool, but I'd like to get the snap functionality ...
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418 views

Controlling robot servo arm (in real-time) via 3d model in blender

I am trying to create and control a robot arm (made of servos) via it's 3D model. I am big fan of Justin Dailey's work -- he was one of the first few people to accomplish this but his 7 year old ...
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1answer
15 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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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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1answer
34 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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11 views

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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17 views

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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33 views

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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1k views

How to export animated character from Blender 2.8 as fbx to Unity?

I have a fully rigged and animated character with shape keys. I created it in 2.79, exported it using ASCII with the settings below and could use it in Unity without any problems. However, after ...
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31 views

Which algorithm does Blender use for Inverse Kinematics?

Is there any documentation how the Inverse Kinematics Bone Constraint is implemented? I assume the problem is written in some kind of minimizing problem and ...
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275 views

Converting FK animations to IK

I have already created a few animations (idle, run...) for a character that I rigged using FK, because I didn't know about IK at the time (I'm very new to animation). However I recently learnt about ...
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2answers
120 views

I can't understand Inverse Kinematics

So I am relatively new to Blender, and while figuring out the process that is rigging, and applying Inverse Kinematics to my armature, I came into contact with a weird problem, Normally, inverse ...
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76 views

Make Pole Targets follow the bone

Im trying to rig a Humanoid in blender, and I have the Iks done with their Pole Targets. My problem its that I dont know what its the best option to make them follow their bone position. I have tried ...
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1answer
283 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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1answer
718 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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42 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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1answer
52 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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555 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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160 views

Object doesn't get motion blur in several frames

I made a robot animation with IK rig. After rendering, as you can see on image 2 & 4, the robot didn't get motion blur at all but the furniture still get the motion blur. image 1 & 3 works ...
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62 views

Inverse Kinematics Armature Rotation

When trying to learn how to animate characters today I wanted to accomplish learning Inverse Kinematics. Watched a couple tutorials on youtube, seems pretty straight forward. When I apply the target ...
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0answers
180 views

Torus animation rig

I am trying to deal with Blender's IK solving system (though maybe I don't need it at all?). I need to animate torus into a smile-like figure (upside- and downside-"smile" animation will be for the ...
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277 views

Get bone rotation from IK

Is it possible to get the xyz euler rotation of the bones in an armature that is controlled by the iTaSC IK solver with python? With the rotation I mean the difference e.g. between the start and end ...
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0answers
100 views

Inverse kinematics offset?

I have a problem with my rig. As I put a IK constrain on the two bones, the constrained one is just offsetting as shown in the screenshot below Is there anything I did wrong? Best regards
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299 views

What are IK bones, and what do they do?

I've been following this tutorial series, and he uses IK bones and the other types of bones that I've forgotten the name of (edit: since remembered, 'pole target'), a controlling bone under the foot ...
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1answer
102 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
16 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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12 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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0answers
5 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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21 views

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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0answers
14 views

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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20 views

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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0answers
10 views

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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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
12 views

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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15 views

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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20 views

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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0answers
8 views

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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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
25 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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0answers
10 views

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
26 views

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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17 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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17 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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35 views

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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37 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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0answers
5 views

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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4 views

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 ...