Matt Romein

I'm working on a project transferring motion-capture data from a BVH file into a matrix. I've used the copynodestoclipboard message to create a network of jit.anim.node objects that should report the position of each point when receiving the getposition message. However, I've found that only points in the file listed as ROOT report their state reliably while the points listed as JOINT report only one position but do not update. Is this a bug within Max or is there a different message or setup I need to get the JOINT positions to output their current location? Attached is zip containing a folder with a patch showing the problem and some sample .bvh files.

trouble-reporting-position-from-bvh-files-using-jit-gl-model

hey matt. i'm pretty sure you want to query the world-position (getworldpos) instead of the position, for these nodes. position is actually a local position, relative to it's parent node, and is not going to change over the course of an animation. it's the global world-position, @worldpos, that you want.

hope this helps. hope you're recovering from your recent trauma.

hey matt. i'm pretty sure you want to query the world-position (getworldpos) instead of the position, for these nodes. position is actually a local position, relative to it's parent node, and is not going to change over the course of an animation. it's the global world-position, @worldpos, that you want.
hope this helps. hope you're recovering from your recent trauma.


Hey Rob. That was exactly the issue. I had tried that earlier but with the message getworldposition rather than getworldpos. That makes logical sense that the local position would always be fixed to the root. Thanks buddy!

Physically I'm alright by now but there's a wound deep down in my soul that may never heal.

I am just curious Matt what are you trying to build with that patch, it looks very interesting... If you need help or an advice I can maybe chime in, it's been a while I am dealing with max and bvh files....

I am just curious Matt what are you trying to build with that patch, it looks very interesting...  If you need help or an advice I can maybe chime in, it's been a while I am dealing with max and bvh files....

I'm in a grad program right now and have access to a motion-capture studio so I proposed a project for one of my classes to work with a choreographer and their movement data and translate that information into Max.

I've managed to get a mock up going with some example .bvh files I pulled from some google searches. Each of the joint points gets pack into a 3 plane matrix and I'm using that matrix as a control matrix for the jit.gl.nurbs object but also doing some munging on the data before it reaches the jit.gl.nurbs. My goal is to make an abstracted geometrical representation of human body that's still recognizable as movement coming from a dancer.

Now I just need to get into the motion capture studio. Seems like I've having some trouble going through the proper channels to get access since it's still so new...

Hey Benoit,
I'm in a grad program right now and have access to a motion-capture studio so I proposed a project for one of my classes to work with a choreographer and their movement data and translate that information into Max.

Now I just need to get into the motion capture studio. Seems like I've having some trouble going through the proper channels to get access since it's still so new...


Trouble reporting position from .bvh files using jit.gl.model