TutorialBlade.pdf

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MOTION CAPTURE USING VICON BLADE AND MAYA
September 2012
LOGIN
On MOTCAP: to capture and save the motions
Username: MOTCAP\hku
Password: Nico-alas
On MOCAP: to load motions and prepare animations
Username: MOCAP\hku
Password: Nico-alas
START A NEW SESSION IN VICON BLADE
1. Switch on the motion capture cameras and connect to them:
At the top left of the Blade Interface – make sure you hit
Connect
– you will see the
cameras respond by lighting up bright red LEDs, with a blue and a green light. The blue light
indicates that cameras are connected. Once we finish the wand wave the green lights will
stop blinking and be on solid.
The Vicon Camera icon (below) will turn
red
when connected.
2. Create a new database for your motions:
Create a folder
on the hard drive of the PC where you wish to create your database and store the
motions.
Click on the Vicon Camera icon and select
Data Management
from the menu.
Click
new database
(purple barrel over the sun icon). It brings up a dialogue box.
Set the
location, name and template
and click create, then open.
Right click anywhere in the database by selecting new at the top and create
project / capture day /
session.
MOTION CAPTURE USING VICON BLADE AND MAYA
September 2012
CALIBRATE THE CAMERAS
1. Set up the cameras for calibration:
Make sure you are connected to the cameras.
Set your workspace to be
Camera Layout.
This is under the
Studio Activities tab.
Set the drop down menu below the Connect icon to
Circle
Fit
for the real-time engine.
NB:
It is important to note
that this is set to Circle Fit or None for the camera
calibration, but it will need to be set to
Reconstruct in
Capture mode
– otherwise you will not see any markers in
the 3D workspace.
You should now see each camera in perspective view, and
the view from each individual camera. If you cannot see
markers in a particular camera’s view, make sure that the
strobe, threshold and gain
are of similar values to the
other cameras.
2. Perform the calibration:
Select the
auto-threshold operation
in the
Calibration
Pane
in order to remove background noise.
Select the
5-marker wand and L-frame
option under the
expanded Calibrate MX cameras section and click start
wand wave.
When a camera has recorded enough frames with the
wand, the led will go green. When each camera’s led is
green, click
Stop Wand Wave.
Place the L-Frame into the centre of the room and make
sure that the levels are even. Run the
Set Origin
operation for a few seconds.
You can then
Save Calibration
if you wish.
MOTION CAPTURE USING VICON BLADE AND MAYA
September 2012
CALIBRATE THE ACTOR
1.
Ensure the
45 markers
are placed correctly on the actor:
5 on the head (2 front and back, one at the top)
4 on the shoulders (front and back for each side)
12 on the arms (4 on each hand, and 2 on each elbow)
2 on the chest (clavicle and sternum)
2 on the back (same place as clav. and stern.)
4 on the waist
16 on the legs (1 one each upper leg (asymmetrical), 2 at each knee, 5 on each foot)
When placing markers either side of the joints, make sure that they do not move as
the actor bends the joint e.g., the markers at the elbow should not move whether
the elbow is bent or straight
MOTION CAPTURE USING VICON BLADE AND MAYA
September 2012
2. We now need to capture the actors full Range Of Motion (ROM) so
that Vicon can fit our template skeleton to the actor:
Go
to Actor Layout
under Studio Activities
In the Capture pane at the RHS of workspace, give an appropriate
name for your ROM,
e.g., ActorName_ROM
Click the
Start
and
Stop
buttons to capture the motions
Range of motions:
Ensure that the full range of each joint is recorded, so perform the following motions, and if
you are capturing extreme motions include them too in the ROM:
Stand in T-Pose, ensuring that arms are as straight as possible, legs slightly apart
Head – look left and right, up and down, and roll head around
Arms (simultaneously) – move wrists up and down and rotate, bend elbows fully, rotate arms
around shoulders as wide a circle as possible
Pelvis – rotate hips as much as possible
Legs (one at a time) – wiggle toes up and down, rotate ankle, bend and straighten knee,
rotate leg around hip joint
MOTION CAPTURE USING VICON BLADE AND MAYA
September 2012
3. Import the Vicon Skeleton Template (VST) you will base your skeleton on:
Open the
Data Management
pane (LHS), and open your ROM’s x2d file
Under the
Character Management
window, click the Open File Icon and open the file:
C:\Program Files (x86)\Vicon\Blade1.7\Templates\UU_NewSkeleton_Option1.vst,
The VST should now be in your workspace. It is red, because the character has not been
calibrated.
4. Process the ROM:
In the
Pipelines
pane, choose
Actor
Calibration
– this will bring up all the
operations you will need
Run
ReconstructTake
– you can do this
by double clicking on it
Scroll through the take and find a frame
where the character is in a T-Pose and
all the markers are present
Run
TposeLabelROM
Ensure the markers are all labeled
correctly, then select
AutoLabelROM
to
label the rest of the take
Scroll through and ensure that the
labelling is correct throughout the take,
then run
CalibrateActor.
The character will now turn green in the
Character Management pane.
Save
this
as ActorName_NewSkel.vsk so you can
use this skeleton in future takes.

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