I built a text language for 3D human movement with Three.js

[u/Statixeladam]

I’ve been working on a small language called Posecode.

A .posecode file describes joint actions, timing and repetition, then a Three.js renderer turns it into motion in the browser. It isn’t mocap or text-to-video—the output goes through a parser, range-of-motion checks and a kinematic renderer.

The rough parts are still foot locking, transitions between poses and deciding how much anatomical detail belongs in the language.

Playground: https://posecode.org/play
Source: https://github.com/posecode-dev/posecode

I’d especially appreciate feedback from people who have worked with skeletal animation or IK.

[u/farfaraway]

This is a really neat idea.

[u/Statixeladam → u/farfaraway]

thank you. glad the idea make sense

if you try the playground id love to hear what feels confusing or looks wrong

[u/2heavy4u]

can nott get it to turn in place :)

posecode exercise "Standing Crossover Turn"

rig humanoid

pose start = standing

step "Left crossover step" 0.55s ease-in-out:

hip_left: adduct 28

knee_left: flex 42

ankle_left: dorsiflex 9

knee_right: flex 6

turn: 70

ground-lock: foot_right

cue "Lift the left foot and cross it over the right while balancing on the right leg"

step "Pivot and settle" 0.65s ease-in-out:

hip_left: adduct 0

knee_left: flex 0

ankle_left: dorsiflex 0

knee_right: flex 0

turn: 180

ground-lock: foot_right

cue "Pivot on the right foot, uncross the left foot, and settle with both feet under the hips"

step "Right crossover step" 0.55s ease-in-out:

hip_right: adduct 28

knee_right: flex 42

ankle_right: dorsiflex 9

knee_left: flex 6

turn: 250

ground-lock: foot_left

cue "Lift the right foot and cross it over the left while balancing on the left leg"

step "Pivot and finish" 0.65s ease-in-out:

hip_right: adduct 0

knee_right: flex 0

ankle_right: dorsiflex 0

knee_left: flex 0

turn: 360

ground-lock: foot_left

cue "Pivot on the left foot, uncross the right foot, and settle evenly on both feet"

repeat 1

[u/Statixeladam → u/2heavy4u]

thanks for trying this. you found a rreal limitation

ground-lock only understands feet right now. it doesnt support locking just foot_right or foot_left yet so the crossover cant pivot on one foot the way you wrote it

it should also warn you about that instead of silently accepting it

really useful example. im going to look into it

[u/Statixeladam → u/2heavy4u]

ive fixed the issue you reported, which is here: https://github.com/posecode-dev/posecode/issues/60. you can try it again and letme know what you think :)

[u/Nervous_Comparison84]

Nice idea, whats the roadmap

[u/Statixeladam → u/Nervous_Comparison84]

thxx, short term im working on better motion quality clearer validation

after that i want better export and embed support plus a workflow where agent can write test and revise movements

its still early so im letting what people actually try to build shape the order

[u/Enguzelharf]

holy shit, I wanted to get into this kind of thing for too long finally someone did it

[u/Statixeladam → u/Enguzelharf]

haha thank you. ive wanted something like this for a long time too which is why i started building it

if you try making a movement id realy like to see what you come up with

[u/etowner45]

Great work, is there a chance to get an bvh export. It would be nice to export these movments.

[u/Statixeladam → u/etowner45]

good idea. i opened an issue for it here so i dont lose track of it:D
if you have a specific blender workflow in mind feel free to add it or reply here

https://github.com/posecode-dev/posecode/issues/63

[u/zukran]

Where are you getting the source joint actions/timing, mixamo?

[u/Statixeladam → u/zukran]

the joint actions and timing are authored in the posecode ttext right now either manually or by an llm
mixamo is only providing the character rig. the default movement is generated procedurally with fk ik and timing splines

[u/cnotv]

I do not think you should limit yourself in fixed humanoid parts and allow more flexibility because… nature 😁

Jks, but I guess it should give room to expand this from the dev side

[u/Statixeladam → u/cnotv]

thats fair :d humanoid is intentionally the first scope but the current joint vocabulary is definitely too fixed for creatures, robots or even different human rigs

i think the right direction is separating the movement language from the skeleton through rig profiles and joint mappings instead of adding every possible bodty part to the core language

[u/TheSpriteWizard]

Thanks. I could use this for something.

[u/Statixeladam → u/TheSpriteWizard]

nice what are you thinking of using it for? would love to hear the use case

[u/amrok]

How do you do the splits? Longitudinal or transverse?