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BVH and model axis centering: a modeling and exporting problem...


 
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Paradox
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Joined: 19 Apr 2010
Posts: 129

PostPosted: Mon Oct 16, 2017 4:27 pm    Post subject:
BVH and model axis centering: a modeling and exporting problem...
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Hi,

I'm working on BVH files and retargeting on model. My tests say that BVHReader supports the MotionBuilder BVH only, so the 3D model needs to have the skeleton bones with Y up convention.

I have some models from MAXIMO that come in an old 3D model set that works fine (exported by MotionBuilder 7.5). Because I need to apply BVHs to a different model, I've tried to copy the original working skeleton to a my model.

I'm using C4D R18 (exporting in FBX 2010 because is the only one that works well with textures export too) to do that and basically works.

But there is a problem. In the first video ("ok") we can see the original model: he falls on your knees correctly using as origin point one at foots level.

https://drive.google.com/open?id=0BwklgQHmJ_FuZlRsS2RPb0d0ak0

In the second video ("wrong") we can see the new model with the original skeleton exported via C4D: it falls on your knees in a wrong way using as a point of origin one at waist level.

https://drive.google.com/open?id=0BwklgQHmJ_FuVzNBemk4NlVJdlE

In C4D the main axis of 3D model is EVER at foots level, there are no changes about axis position. Simply, if I'm import in the C4D the MIXAMO original model and I export the SAME model without any modification, the incorrect behavior come up! We have a similar behaviour using Blender also.

Someone had a similar experience using BVHs?

Thank you!

Cheers,
Dario
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