Questions tagged [skeletal-animation]

Skeletal animation is a technique by which a complex mesh (or "skin") is animated through the animation of a simpler hierarchical collection of geometry (the "bones").

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49 views

How to code custom mocap importing? ( imperfect bone positions = incorrect bone sizes )

I’m writing some code to acquire poses from custom DIY mocap system. The issue is that the acquired positions and angles of each joint/bone are not too accurate, which means the generated bones and ...
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16 views

Posing a skeleton & seeing it update in the viewport in UE4

My dilemma I am facing is: I have modelled a Neuron (octupus looking thing) in blender and attached an armature to each tentacle so that I can pose it in Unreal. Export to UE4 with skeletal mesh, open ...
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How to animate a customizable pixel art platformer character?

I am working on a 2d platformer which is made up of pixel art. I want to make my character customizable like in stardew valley. How can I implement it and create animations for my game like run , idle ...
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27 views

Only part of my model animates, the rest stays still

I made an animation for when my character grabs a ledge, which has him set his arms and head into a position, and have him swing his legs back and forth, however only his legs move and his arms and ...
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27 views

Mixamo Rig Hierarchy Reference (In Text List/Tree format)? (modelling in Maya for use in Unity and Mixamo)

I'm trying to find a quick reference to match Mixamos rigging hierarchy. I'm confused over which bones are 'root' and how many bones in the spine/pelvis/chest etc. I want my characters I make in Maya ...
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IK handle for 'Back' bones. Allowing me to move body downwards and have the knees bend

So I've followed several tutorials and documentation about rigging my humanoid character in Maya. I've had the same problem with the automatic rig from Mixamo, as well as my own one I just made ...
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46 views

How to use SetBoneRotationByName() to rotate a single bone in a armature?

I am very excited to finally be learning Unreal engine development! But I have been working with Unreal editor for only the past couple of days but am having trouble understand how to rotate or ...
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1answer
74 views

How can I add these bones to my meta human? Or is there a way I can make virtual bones count when retargetting?

Paid for animations thinking they would be fine and they mostly are but... the hands are using these IK bones that I do not have. Is there a way I can add the bones to my meta skeleton within unreal? ...
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(Unity Engine) Is it possible to make 2d animation bones perfectly straight within the sprite editor

I am experimenting with pixel perfect camera and 2d animation. I noticed in the skinning editor that there is no option to edit bone coordinates. When I make an ik it extended the arm making it ...
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Is there a standard way to rig a humanoid?

I am using some placeholder humanoid models for my game, which will be replaced later. I am concerned that when I replace them, they will not work with my animations, due to different rigging. Is ...
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41 views

Some of the model's vertices are incorrectly positioned in skeletal animation

Everything is almost ready 😣. I do not understand what the problem is. The animation works, but some vertices are not where they should be. I am using an SMD file from Half Life. I found that these ...
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5k views

What is the standard practice for animating motion — move character or not move character?

I've downloaded a bunch of (free) 3d warriors with animations. I've noticed for about 25% of them, the 'run' animation physically moves the character forward in the z direction. For the other 75%, the ...
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46 views

Cloth tool and Skeletal Bone Weight Paints in Unreal Engine

Just a quick question: I've got my 3rd person rigged and skinned, but I have some hanging fabric around the characters waist which drapes down to the characters legs. Should this fabric be weighted so ...
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323 views

FBX Import Errors: “Multiple roots are found in the bone hierarchy”

I followed these steps: I exported my character from Blender as an fbx file I went to Unreal Engine and make a new folder I paste the fbx file in that folder I put and tried to put it with a ...
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51 views

Skeleton bone in incorrect spot in-game yet, blender rig, skeleton mesh and physics asset are all correct and behave properly

I've made a custom character and rigged it in blender. Then exported/imported into ue4. It behaves properly in the PHAT and the skeleton mesh looks fine and it all behaves properly in the simulations. ...
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23 views

IK script causing glitchy movement

I have a FPS character game object, which consists of just the arms. I made this IK script off of a tutorial. ...
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54 views

Blender animation's curled fingers are splayed-out when played in Unity

I have exported my character into Unity and all the animations came with it. At first, I thought I was good to go but then I made a jogging animation. In blender the hands are gripped like this: When ...
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216 views

How do you use custom collision on a skeletal mesh in UE4?

I have a vehicle rig that is a skeletal mesh that imports fine in to unreal but I was wondering how to use a mesh for collision on it. Normally you can just name the collision mesh with UCX_ in front ...
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28 views

Unwanted blendspace bone displacement in UE4

My characters hands "fall off" in the blendspace between the animations. Looking for a way to fix it, if anyone has any ideas.
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34 views

Creating a weighted mesh from skeleton data

I am trying to wrap my head around animation, but I am having some problems. The lower body looks ok, but upper body is still very wrong. I think my problem is that I have introduced some scaling ...
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1answer
57 views

No local transform with skinned mesh with assimp?

I'm trying to add skeletal animation to my engine and I'm importing meshes with assimp, but I think I misunderstood the skinned mesh concepts (or don't understand assimp). When I import a model, ...
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1answer
464 views

mesh gets twisted wildly when trying to use Unreal's mannequin's skeleton

I have modelled a simple mannequine and made a skeleton for it in Blender. As far as I can judge, this skeleton copies the Unreal's standard mannequine's skeleton perfectly... All the hierarchy and ...
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How can I allow player-created content to add morphs to Daz Genesis 8 characters(UE4)?

We use Daz Genesis 8 characters in our project. Content creators would load their morphs from Daz to our game. We would like to add these morphs to our characters so they can be modded, edited and ...
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722 views

How to support importing .uasset files in game for content creators(UE4)?

I would like to support importing clothes(as SkeletalMeshes) and props(as StaticMeshes) as uasset files into game for content creators, which obviously have not been packaged with the game. Basically ...
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Blender bone animation with extruded vertex not moving as expected

I'm really new to blender. I've managed to make a model body and bone structure. I've two problems: But when I try to rotate the arm bone, my entire body moves. Why is this happening? I was ...
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93 views

How would I combine FABRIK inverse kinematic results with a skeletal animation?

So, I've been working on a skeletal animation system in OpenGL/C++, and it's actually not coming along too badly. I can play animations, which I do by sending bone transform matrices to my animation ...
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155 views

ASSIMP Skinning seems to be somewhat inverted

I'm currently implementing Skinning using Assimp as my asset importer. I've relied heavily on the following tutorial in order to skin meshes (http://ogldev.atspace.co.uk/www/tutorial38/tutorial38.html)...
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1answer
586 views

When setting Rigidbody.isKinematic true collider won't work anymore

I have a rigged 2D character and used Collider2D/Rigidbody2D/HingeJoint2D to body parts to implement ragdoll. It works fine, but I needed to run ragdoll physics only when character is dead. So I made ...
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2answers
61 views

Rotating 2D bone in LateUpdate have jittering issue

I made a skinned 2D character and applied IK to each hand and leg. In my game, player can aim up and down by moving fire joystick up and down. This is implemented by update "chest" bone's rotation in ...
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250 views

How is root motion done in Skeletal animation

I am using Assimp library to load bone and mesh data and using basic interpolation to accomplish the animation part. Right now I want to move my character position with animation, i.e. root motion. ...
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2answers
86 views

Parts of 3D model disappear during animation

I'm trying to properly play an animation done in Blender 2.8 inside my OpenGL application. When the animation is running, it happens that at some particular frames, some parts of the 3D model "...
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1answer
2k views

Mixamo: can animations (“without skin”) be re-used on any Mixamo rigged model?

I've discovered Mixamo very recently. I plan to use its auto-rigging capability on all my unrigged characters. The download option can either include the skin or just obtain the animation. My ...
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125 views

Understanding ticksPerSecond and duration with skeletal animations

That's my first question here so i hope to do all correctly. From various weeks i started surfing the net about Skeletal animation aiming to add a simple animation controller into my small game engine....
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1answer
379 views

ASSIMP skeletal animation with some FBX files has issues - weird node added

Hi I'm trying to work load fbx files to my OpenGL Renderer using ASSIMP. However, weird nodes that are not in the original fbx file are added whenever I load the file with the ASSIMP importer. For ...
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47 views

How can I rig an object to animate from two different orientations?

As an example: Say you're animating a skateboard. The board has a nose and a tail. Normally, the nose points forward and the tail points backward. Now say you have two animations: idle and trick. The ...
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1answer
627 views

instancing and GPU skinning

I'm trying to render a large number of identical rigged entities with independent animation. Compared to standard skeletal animation, I can't compute the pose of each entities and send it to the GPU ...
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1answer
74 views

Armature's bone can't be rotated in Unity when I'm trying to rotate its chest toward its looking direction?

I want to rotate my character's chest, so its looking direction will be visualised correctly. But I think that the animation controller doesn't let me. I logged its rotation before and after I set ...
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1answer
540 views

SteamVR Unity Skeleton Pose NullReferenceException

I'm developing an application using SteamVR in Unity. When running my app, the console keeps getting flooded with hundreds of instances of this error: ...
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1answer
233 views

Transform bone absolute position to relative position

I'm working on adding IK to my engine and right now I'm implementing the FABRIK algorithm to give full support to more than three bones. The algorithm works by giving the joints positions, the start ...
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1answer
435 views

Unity Anima2D - IK Limb for leg not working

I'm having an issue getting an IK limb to work using Anima2D in Unity. If I place a limb IK for the neck joint, the head moves as expected, however trying to place one for the leg seems to have no ...
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38 views

Calculate animation weights based on two variables

I am working on a custom engine and have been tinkering with animations using the Cal3D library. My previous experience with animations was based on prototyping a bit with Unity's Mecanim. Right now, ...
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984 views

Unity sprite rig affecting performance

I created a simple sprite rig using the skinning editor provided by the new 2D Animation V2 package. But it causes a huge FPS drop when added to the scene. Methods such as SpriteSkin.LateUpdate ...
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1answer
278 views

Individual Skeletal Animation with OpenGL

I have been able to implement a pipeline in OpenGL which reads Collada files and can animate them through interpolating the keyframes. However, as somebody brand new to graphics, I don't quite know ...
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40 views

Can COLLADA be used for partial animations / animation blending?

I am making a game engine, using the COLLADA format for my models. Part of the requirement for my models is partial animations, for example if the model was a person, an animation could only affect ...
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1answer
201 views

Does it make sense to export and use skeletal animation as sprites?

As tools like Dragonbones, Spine lets you export animations as both sprite atlas and skeleton data (JSON/binary), I'm not sure which format to use when importing to Unity. I have few concerns: Will ...
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49 views

Blender - Exporting and Replicating Bone Animation

I'm having trouble replicating Blender bone animation in my game. Bones that have a vertical rest position (Euler(PI / 2, 0, 0)) are animated correctly (e.g. head, neck, torso, legs, shins), however ...
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1answer
491 views

Help with dual quaternion skinning

I'm trying to convert my code to use dual quaternion skinning instead of matrix skinning because i just can't get the skinning matrix created correctly from bones+weights using matrices. Edit: just ...
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1answer
71 views

Do all normalized quaternions represent valid rotations?

Basically, I'm getting a bug where the rotations in the animations seem to be skewing the model even though I'm normalizing them. I suspect that the rotations are showing the error, but not causing it,...
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80 views

Bones are rotated wrong direction on play mode

I made animations from Blender and exported as FBX. However in Unity, default pose seems fine in edit mode. But in play mode, spine bones are rotated wrong direction: It's Humanoid type and each ...
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1answer
202 views

Skeletal animation: unexpected quarternion values

I'm following ThinMatrix's skeletal animation tutorial and his custom written Collada parser is deriving a different rotation quaternion from each keyframe matrix than the Assimp importer library does....

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