Motion Dynamics in MB?

#1

Dear fellow artists.

In this video http://downloads.alias.com/mkt/gmk_motionbuilder6_character_animation_basics.swf
you will notice a chin strap attached to the characters helmet that seems to follow the trsl of the head automatically (motion dynamics?), and creates a nice secondary animation.
I understand that MB comes without a Motion Dynamics feature. Any idea, how this can be done? Scripted perhaps?

Thanks a lot and regards,
Pjot

#2

its done with the relations constraint inside of motionbuilder, damping 3d under other in the constraint.

#3

Thanks a lot.
P

#4

ok, found the 3d damping, thanks again.

im still not getting this to work:

i have an hirarchical bonechain to deform my character´s tail. i want part of the chain to rotate additive, controlled by only one driver, inheriting ROT to the constrained (child)bones.
i tried the rotation constraint, but it doesnt have that “additive” feature, so the rest of the chain remains stiff.
i had a similar setup in c4d, where the starting bones of two segments inherited additive rotation to the tail. it was easy to create nice curves this way, with only two controls.

any idea? and: besides IK (tried it, worked, but the ROT solution to me has more snap), what is your favourite approach riging a tail (its a biped).

thanks a lot for your efforts.
regards,
p

#5

Pjot:

Theres a tutorial at 3dbuzz for relations constraints that deals with how to rig a tail. Gives you step by step on how to create the constraint using 3d damping and it is really good.

I created a series of skeleton nodes which I then parented to the hip on my character, now, what I did differently from the tutorial was instead of creating only one integer node that provides the damping vector for all the links, I created 4 then distributed them evenly between the nodes (4 nodes for each integer damping vector) You’ll see what I’m talking about when you see the tutorial.

The only problem I’m having now, is that the tail at times goes through the floor… but I’m waiting to see if someone has a solution for that…

hope this helps!

Bryan

#6

… sounds good, i´ll try that.

thanks a lot,
P

#7

In the Relation constraint window, Under “OTHER” try the Damp 3D node and the Damp 3D (Clock based). It’s a bit slower than the Rotation’s Damp node, but I’ve had better results and no flipping of joints.

#8

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