Oversize / undersize VRM models are moved from origin when playing an animation

[Samsy]

Been trying to figure this out for a while.
But out of solutions.

I've been using a VRM models following a standard size at first, no problem.
Did scale and baked the transform on the model on blender everything look fine :

But adding a FBX mixamo animations moves it from his origin for some reasons :

Same thing happening for undersize models like :

Any clue ?

[ke456-png]

This is due to the height difference between VRM and Mixamo FBX.

I think it can be corrected by comparing the height of the hips and adjusting the animation.

Created PR to modify examples/humanoidAnimation. #1074

[Samsy]

Tried it right now, and still no chance
It's not fixing the height

You can try it with this sample model for example ( undersize ) :

https://github.com/madjin/vrm-samples/tree/master/meebits

[ke456-png]

#1074 has been merged to dev.

I have confirmed that it works on the sample model .

Please pull the dev branch and check it.

[Samsy]

I pulled dev and tried with a mixamo animation there using the girl vrm you provided

I got a hipsPositionScale 15329761635064230 using the first mixamo animation on their website exported as non skin

link to fbx without skin :

https://mixamo-storage-prod.s3-us-west-2.amazonaws.com/user/972F1B3B50C1BCF20A490D4D%40AdobeID/character/907e6b7d-df67-4658-9ea8-1affcbb4c665/tmp/export_11cb4999-9d22-44d6-9792-bbbc705e39c9.fbx?response-content-disposition=attachment%3B%20filename%3D%22Body%20Block.fbx%22&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=ASIAQYKQKDRY3BMPNKLF%2F20221004%2Fus-west-2%2Fs3%2Faws4_request&X-Amz-Date=20221004T111446Z&X-Amz-Expires=300&X-Amz-Security-Token=FwoGZXIvYXdzEBUaDAUJFxYjbXHfpo0UnSLUAUI1NLt%2BI9zoEqaHHepRa9zXSa51lNjjrqDMJA5YZlHGlilP4Mm84H2QVGHqANygAru9SEfRy3vswScSvWY26CujbRI6P3KAwVqXINT32Y8tJbaEXfZDdMzBDrUJ%2FysNA0N5rxUAksuCCnNuyqX6SidHXR71ofkDrCXVhFPdA9UDS3CLW%2FRsqMjNrw%2FpHUQakh57hFo%2FSvKMVn9qeIds9Rdr%2F4pfgloCBlsDWfRynNuok2yKvefQZAE%2BIcRv9GpMAL64%2FQ%2FqjVVdAKIoR3SBv0zcQ3SMKOyq8JkGMi00nHb88V9wQ8t7ItXuT0qZHGSvz%2FjvKhukSkLEIBTA%2BIyY9rRmxmDTV0G9vs4%3D&X-Amz-SignedHeaders=host&X-Amz-Signature=292ff588348d95c9ffd267f19f7ac4b97729ccad8cccfbbab015efde0ff467b4

[Samsy]

FIxed oversize it by using :

var value = track.values.map( ( v, i ) => ( vrm.meta?.metaVersion === '0' && i % 3 !== 1 ? - v : v ) * 0.01 );
value = value.map( ( v, i ) => i % 3 == 1 ? v + vrmHipsHeight * 0.5 : v );

but it is breaking the original size now

[0b5vr]

The link you provided does not seem to work.

I have tried the animation "Body Block.fbx" without skin on my account and does not reproduce the behavior you reported.

[madjin]

hey that's my meebit! :D

[0b5vr]

Converting to discussions for now