Motion Builder - MoCap Cleanup and Re-targeting

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In this demonstration, Markus Hammarstedt shows how to retarget and clean motion capture in MotionBuilder.

Lobo (not verified)

January 25, 2012 - 3:29pm

Thanks for the tutorial Markus! Videos from professional animator's working in the industry are hard to come by and it's great to see another animator's workflow.

Just some quick notes: You're clearly a talented animator, so I hope this doesn't come across the wrong way, but a lot of the problems you're having to fix with keyframing could be solved a lot faster with a few quick tweaks to the retargetting...

1. A lot of animators will place the actor inside the markers, add the markers to the marker set, and then leave it at that, but you can actually tweak how the actor sits between the markers, after the marker set has been activated. You can even make tweaks after your character rig has been imported and driven by the actor.

This really helps solve issues like your head/neck problems, or problems with arm twist that are difficult to judge clearly from the T-pose. It's typically better to do this than solving these issues after the bake with keyframing, because it affects how the entire motion is solved, so it'll fix all manner of problems, not just a specific instance.

2. When you first drop your soldier character into the scene, there's a size disparity between the actor and the character which could cause retargetting problems (usually over-extension on the legs). You can solve this really easily by scaling the C3D center point (the white sphere that all your mocap markers are parented to). Just select it, scale it down and the markers/actor will scale down with it, until you get a good match with your character rig.

If it's still not matching up quite right, go into the character options in the navigator and in Retargetting, check Match Source, and then play with Action Space Compensation, Reach and Offsets to see if you can get a better match. You need to do this before you bake.

3. When you're dealing with a big, bulky character like this, you'll probably find that the mocap actor was able to move with more freedom than the armored character would be able to. In your motion you can see this a little with the problems you're having to fix in the shoulders and neck, and it's often quicker and easier to fix these issues using motion reduction. After you've powered your character rig by the actor, select your character in the Navigator, and go to Retargetting > Actor > Motion Reduction. The sliders in that section allow you to reduce motion on the chest, head, neck and shoulders. You need to be subtle with these settings because you don't want to nuke too much of your mocap data, but it can be much faster solving some shoulder, head and neck problems using these sliders, compared to keyframing.

Anyway, hope that's useful, and like I say, I hope these are seen as additional tips rather than critique. Smiling

must (not verified)

February 7, 2012 - 7:25am

thx a lot for this video. Looking forward to an advanced Motionbuilder DVD Smiling

Anonymous (not verified)

March 1, 2012 - 5:50pm

Great to see how a professional works with motionbuilder. Thanks for this video!

Anonymous (not verified)

March 16, 2012 - 12:23pm

Thank you for the tutorial Eye-wink

3DMan (not verified)

March 31, 2012 - 11:11pm

I've been searching for a decent Motion Builder Tutorial like this. If Eat3D could create a decent DVD on Advanced Motion Builder, I think they would beat a lot of other publishers to market. I know I would buy it.

Anonymous (not verified)

April 29, 2012 - 10:30pm

gracias por el tutorial, nesecitamos personas como usted, para aprender este gran programa..

Anonymous (not verified)

May 8, 2012 - 11:53am

any reason why you dont play with the retargeting settings before ploting to the rig? you would save a lot of editing time
also, why are you creating a complex setup to delete the fk data of left arm and leg? you could just reach ik, and delete the fk curve you dont want

son sounguk (not verified)

May 21, 2012 - 12:14am

thank you!

Anonymous (not verified)

July 2, 2012 - 9:30pm

wanting to learn

gopal p (not verified)

February 5, 2013 - 5:08am



March 23, 2013 - 4:18am

Thanks, Lobo!

itsyou28 (not verified)

August 20, 2013 - 6:02am



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