Questions tagged [bones]

Bones are the individual sections of an armature that are used to deform the mesh. Bones act like other objects (they have properties and can have constraints) but are invisible in the render.

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35
votes
2answers
20k views

How to make rig that reacts to gravity or seem to behave physically correct?

Here's a nice, strangely familiar hat. It's rigged with three bones. Let's say I want the hat to fall like a real hat would, and bounce around when the character which it's attached to moves. I could ...
17
votes
2answers
12k views

Is there a way to convert a constraint to a keyframe?

I have a model in Blender with a full rig, including IK bones. I also have a sword with two bones, on the top bone of the sword I have a set of constraints that copy the location and rotation of a ...
16
votes
5answers
58k views

Join bones in a armature?

I have a simple armature that has three loose bones that I would like to join at one joint. Is there a way I can join these 3 into a single joint?
14
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2answers
1k views

How to simulate Miura-fold

I'm hoping to find advice here for simulating the Miura origami in Blender. I have searched quite thoroughly on methods and have only come as far as my failed attempt in my attached image above. The ...
14
votes
1answer
3k views

Animate the parenting of an object

let's say we have a magazine, a gun, and hands. The magazine is parented with the gun. When I make an animation of reloading, I want the Magazine to be a parent of the hand, then after the magazine ...
12
votes
2answers
16k views

How do I parent another object only to a specific bone?

I have hands model which I rigged, now I want the gun to be parented to the left hand, where the problem occurs as left hand is the same object with the right hand, so by parenting the gun to the bone,...
12
votes
1answer
10k views

How to Set/Calculate pole angle of IK constraint so the chain does not move?

How to calculate the exact pole angle so when I add Pole bone the IK chain does not move?
11
votes
4answers
6k views

Three bones following a curve

I have a chain of three bones and I want them to follow a curve (bezier curve). I've tried to do this creating a bone constraint follow path but it doesn't work. I'...
10
votes
2answers
16k views

how do you merge two bones into one?

I have a generated mesh and set of bones from a makehuman model but it created two bones in the shin. How do I merge the two selected bones into one bone but keep the skeleton intact, i.e. the knee ...
10
votes
1answer
2k views

How to rig a cartoon-style hose limb?

I was wondering if anyone knows how to set up a hose-like, cartoon-type limb like in this picture? My current setup for my model's limbs uses Inverse Kinematics and actually works quite well for the ...
9
votes
2answers
1k views

How to rig a shirt with buttons so that the buttons follow the mesh of the shirt

I didn't address this in a while because I was busy with something else, but now it has cycled back into my schedule. Right now I have a shirt modeled and bones set in place. It's already technically ...
9
votes
2answers
6k views

IK-rig doesn't bend when I add elbow-target/elbow-pole

I have an IK-rig set up for my arm. An upper arm bone, a lower arm bone and the arm-IK bone, like so(front-view): The IK-rig works until I add an elbow target/elbow pole. At this point, the arm stops ...
9
votes
3answers
3k views

How can I manually calculate bpy.types.PoseBone.matrix using Blender's Python API?

I have this .blend file which has a simple scene, and a python script. There's a readme section in the script, but to give a general idea: There are two identical meshes in the scene, one skinned, ...
9
votes
1answer
788 views

Can armature/bones be edited without edit mode?

I was looking after some information about armature and bones, so I can continue my importer script. I found some nice info here; no BMesh, and simple enough for my needs as beginner, so just perfect. ...
8
votes
3answers
14k views

How to recalculate automatic weights for single bones?

After I edited an already weighted model and its armature, the pose mode doesn't grab the limbs the right way anymore. Is there a way to recalculate weights for single bones? Because I already edited ...
8
votes
1answer
16k views

Bones not moving in pose mode?

When ever I try to move or rotate a bone in pose mode, nothing happens. The bone stays frozen, not moving to any axes, no matter what bone I chose.. I tried rigify ready to use mesh but had the same ...
8
votes
1answer
13k views

Can I mirror animations on bones?

I have a model of a dragon. It's mesh was made by mirroring and also was it's bones. I want to animate a wing, but want to make the other wing to animate equally, but mirrored. Is it possible? I'm new ...
8
votes
2answers
4k views

How do you export bones relative to parent?

I'm currently writing an exporter script. So far, I can export meshes just fine, but I've got some problems with exporting the armature. According to the python api, there are three different types ...
7
votes
2answers
13k views

How can I reverse the direction of bones in my armature?

I spent a lot of time building up my armature for my dragon model and then, after I was all done and started to refine it, I realized that the bones from the pelvis out to the end of the tail were ...
7
votes
1answer
30k views

How to IK rig legs

I have a simple character. I would like rig the legs so that I can easily control them. How can I IK rig my characters leg? .blend file
7
votes
2answers
991 views

Folding a cube (animation)

I'm trying to fold a cube with an animation. I've tried inverse kinetics with no luck. Here are some images that explain what I'm trying to do. I'm trying to make this so that when the upper bone is ...
7
votes
1answer
445 views

Glue like effect

I've been playing recently with rigging and tried to recreate the effect of a glue or goo like material in blender with no much success (still new with it). To clarify, I've added a pair of bones so ...
7
votes
1answer
8k views

How can I position bones in a model easily and precisely?

I tried to position the hand bones of my rig / armature, but it was SO difficult to get all those little bones to align in 3D space accurately, even when I was using Quad View. After working on it for ...
7
votes
4answers
826 views

IK refusing to follow target around Z axis

The IK have set up does not follow the target around the Z axis. I am using an Empty as the IK target. You can download the blend here. Each bone except the bottom one has the following IK ...
7
votes
1answer
1k views

How are the Bones assigned to the Vertex_Groups in the API?

I´m working on an export script for Blender and I´m currently stuck at exporting bone weights. Here is what i have so far(excuse me if my Python is not that clean, the syntax is pretty new to me): <...
7
votes
1answer
21k views

How to re-parent a bone?

I have rigged a gun, but the bones/armature is attached to the wrong bone. I need to move all the bones which are meant for the gun to a different bone. Images which explain the problem:
7
votes
1answer
460 views

How are bones & armatures connected to the rest of a model?

Let's say I'm really new to Blender, and have just barely figured out what keyframes are for. Explain a Blender skeleton to me like I'm five. Do I need to use it, and how exactly does it connect to ...
7
votes
1answer
2k views

Why do some bones in an animation lose their position when applying scale to their armature?

After starting with a stock armature with a run cycle I added a few of my own bones for various armor pieces on my model. As the stock model is too large for my game and the engine requires me to ...
7
votes
2answers
8k views

Is there a shortcut to keyframe an entire skeleton?

I'm new to animation in blender and I'm trying to make some character animations for UE4. I was wondering if it were possible to keyframe every bone at once instead of having to hit 'I' over rotation ...
7
votes
1answer
7k views

Bones moving wrong part of mesh?

I have an armature set up, but the bones aren't moving the mesh properly The mesh and armature: The vertex group of the bone I am going to move: As you can see, the circled region doesn't belong to ...
7
votes
2answers
250 views

how to rig this object (function compass)?

I'm trying to make something like a compass which is used to draw functions on paper. but I'm stuck and I have no idea how to rig it. I want to make an animation to show how it works and I want to ...
7
votes
1answer
2k views

How does 'local with parent' space work?

My question touches the mathematical side of Blender more than the modelling one. I am having a problem understanding how the 'local with parent' space in bone constraints works. I have looked ...
6
votes
6answers
19k views

In Pose mode, my bones are stuck in rotate, and wont transform

When in pose mode, the bones on my model wont transform, they are stuck in rotate mode, though I can scale them. This problem now occurs whenever I try starting a new project. Some bones that I made ...
6
votes
3answers
18k views

How to assign vertex group to single bone

I'm trying to animate a simple character in blender. I made a very simple armature, with a bone for every moving part of the mesh. Each moving part is "stored" in a vertex group, and I would like to ...
6
votes
2answers
6k views

How to copy constraints from one bone to another?

I've created some shapekeys driven by the bone controllers for my character. Then I gave constraints to the bones on the left side. Now I want to copy and paste them to the right side. Two questions: ...
6
votes
1answer
23k views

character made with multiple objects one armature or different armatures

This is a character that I made in Blender with multiple objects When I added an armature fist, and joined the object and test, it didn't work. Then I linked parent but that didn't work either. ...
6
votes
1answer
6k views

Custom shape's bone

I'm doing a rig and I want to modify the shape of my bones: in particular the control bones of torso. Here a simplified situation: I want to change the shape of my octahedral bone in the circle ...
6
votes
1answer
4k views

How to restrict vertex weights to no more than N number of Bones?

I have a program that can animated a mesh using OpenGL but problematically it can only work and not crash when each vertex weight is affected as per the title to a maximum of four bones. The tutorial ...
6
votes
2answers
4k views

Get the location in world coordinates of a bone's head and tail while in pose mode

I have a bone and I need to get the location of its head and tail. I know that I can search for the corresponding edit_bone, but this list is only filled in edit mode. Is there a way to get both ...
6
votes
1answer
8k views

Can't flip pose properly

I have a problem with flipping pose, I try to do the same thing as in this tutorial. On 3:25, he flips the pose by Ctrl+C, Ctrl+Shift+V. In my case, it only flips some rotations, but legs stay in the ...
6
votes
1answer
2k views

How do I animate a character with dangling chain

I have a fully rigged character and I would like to attach some loose parts to it, including a chain. How do I set this up, so the chain would freely 'dangle' from the character, following forces like ...
6
votes
1answer
270 views

How can I tear two bones and their skinned mesh apart during animation?

I'm trying to create a stylized version of the black knight sketch from the movie Monty Python and the Holy Grail. Two characters are engaged in a sword fight, with one of them ultimately loosing a ...
6
votes
1answer
289 views

Limiting the roll on a rigid body cylinder joint chain

I am trying to setup a rig that is based on rigid body shapes driving bones that then drive a mesh. The current setup is a chain of cylinders attached to each other with rigid body constraints (point ...
6
votes
0answers
1k views

How does blender calculate poseBone.matrix?

How does blender calculate a poseBone.matrix through the hierarchy chain? A bone's final matrix is a transformation matrix which defines the bone in armature-space in the current pose (M1). I want to ...
5
votes
6answers
3k views

Rigging a Pac-Man-like character

I have created a character that is basically a big moving eye with a tail. I am having problems wrapping my head around how to assign bones and weight it appropriately. Here's a picture: I have been ...
5
votes
2answers
41k views

Model won't follow its armature in pose mode

I've set up a rig and built it around my model, and I've linked it to my model but when I rotate the bones in pose mode, the character doesn't move with them. My rig is the human meta rig that comes ...
5
votes
1answer
5k views

How to rotate a bone using python

I have a bone, which i need to rotate. It has to be done on a server all the time, which means, that it would be nice to avoid clicking on the bone. I understand that i need to use: ...
5
votes
2answers
2k views

Using spline-IK for bones but keeping control over individual bones

My goal is to rig the Ears of my quadruped character, which has huge and soft ears (rabbit-like). I've set up a Spline-IK constraint for the ear's bones chain, and added soft body physics to the ...
5
votes
1answer
276 views

Armature/Bone Heat Failed

I have a model which have meshes that are not aligned at x axis. When I try to use automatic weight for connecting bones to meshes, I get "Bone heat weighting: failed to find solution for one or more ...
5
votes
1answer
1k views

How to rig flaps

I have modeled a simple air plane. It has flaps. I would like to easily animate the flaps. THe flaps are part of the plane mesh. How can I rig the flaps so that I have a single control for the flaps?