MB Tutorial Part 63: Rigging a Hand with Sliders III Video Lecture | A Complete Course: Motion Builder - Professional Skills

in this third video of our hand rigging
series we're going to hook up the thumb
curling and thumb swiveling of our hand
rig and add those to our expression so
to jump in and get started we need to
now bring in the FK effectors for the
thumb area which I haven't dealt with so
far everything I've worked on so far has
just been for curling the fingers
themself so we'll scroll down a little
bit just make some room I do like to
skip lines in between different fingers
making it easier to read the spreadsheet
right just for organization so i'll
begin by grabbing the thumb effector and
again because i'm using the maya key set
will just x drag and i'll bring this in
as a receiver right click clear out
scaling and translation grab the next
knuckle down receiver clear out scaling
and translation and x drag down receiver
kill out scaling translation now i do
all again i need these to be local
rotation so we'll right click and set
all three of these two local and to curl
in we're mainly focused just like on the
fingers in the z direction so anything
we do will be based on Z or Zed so how
are we going to do this well this is
very simple we're just going to
essentially make a direct connection to
our slider at first and then we're going
to tweak that because we're going to
find that connecting directly to our
slider will cause over rotation on at
least one of the knuckles so we find our
thumb curl a slider is connected to cell
c6 as you can see here so I'll scroll
back down and we'll take the first
knuckle and will input the vector the
open curly brace 0 comma 0 comma c6
close now press Enter and let's test
this out before I go anywhere make sure
this is locked let's open up and we'll
grab thumb curl and we're curling in now
that's a little bit of over curling but
I'm going to go ahead and finish up the
rest of the fingers before I do anything
else so let's grab this entire line
because I don't want to have to retype
and will paste and paste again
press enter so let's test out the thumb
curl at this point the whole thumb is
curling but this first joint is
bothering me because we don't really
need to curl in that far we're kind of
looks like we're really breaking the
thumb at that point very easy way to fix
this and still keep things nice and
readable in your spreadsheet it's just
to come in here to your Z reference
inside your vector I'll play c6 inside
parentheses and inside these parentheses
I'll add a multiplier just to slow
things down a bit now I may be doing a
little bit of tweaking but we'll start
off with a value of 0.2 and now as we
slide thumb curl we don't get as much
rotation so we're really slowing that
down we could do the same with this
knuckle if we think that's over curling
I can almost managed a similar rotation
on my own hand maybe okay we'll listen
up just a little bit so we'll come in
here to the next knuckle and we'll do
the same thing very quickly it's very
easy to use we'll just put c6 inside
parentheses and inside will say x maybe
only point six so 0.6 press ENTER and
now as we adjust so I'm liking that a
little bit more than good so we have
some nice thumb curling ability now I
would like to be able to slide the thumb
or I'm swivel the thumb so I decide this
would be if you were to hold your hand
out with your palm facing the inlet
let's say left hand you're holding your
palm facing the inside of your body so
the outside of your hand is facing down
toward the carpet and you move your
thumb left and right I'm assuming
everybody has carpet in the room they're
in right now you hear that okay so we
need to know the direction that will be
rotating on this at this point if you
ever get confused with your rotation
just bring up your your rotate tool and
let's make sure we are using local
rotations and it looks like actually
we're grabbing that particular effector
we're going to be using the the y axis
to make this happen so let's go ahead
and I will go to my first knuckle
because that's where our swivel is going
to happen and for now I'll just directly
plug in to my thumb swivel attribute so
over here my list we have thumb swivel
plugged into c7
scroll back down here inside of our
spreadsheet and here's why so we'll jump
in and we'll grab c7 press ENTER and now
let's test this out we'll come back here
to our effector and as we grab thumb
swivel or swiveling our thumb so that's
coming up I'll call that high enough you
can probably I can go up a little higher
with my thumb but again these are open
for tweaking if you need to tweak maybe
it'd be nice just to show that we can
come back to our customized attributes
let's say we take a thumb swivel and
negative 20 is not really far enough so
we'll set this to negative 30 and press
ENTER you'll notice our slider just
updated down here inside of our window
so now I can rotate even higher so
there's the ability to swivel my thumb
and of course I can still curl it as
well so with that we have a full control
of our thumb now granted so we can
control our fingers make a wave curl in
the thumb and swivel the thumb around
cool so that's a against a little bit
shorter than the last lesson but that's
everything that I wanted to cover in
this video so thanks a lot