Tutorial 6: Working with Motion Capture Data
You can import a file either in its raw state with keys at every frame, or with key reduction filtering. You can edit raw motion capture data by moving footsteps in Footstep mode and adding layers to keyframe the upper body. In this lesson you will import a raw motion capture file and edit footsteps.
Editing a raw motion capture file
Create a biped.
On the Motion panel, on the Motion Capture rollout, click Load Motion Capture File.
If this file does not appear, be sure the Files of Type drop down is set to .csm.
On the Motion Capture Conversion Parameters dialog choose On for Footstep Extraction and choose No Key Reduction in the Conversion field. Click OK.
The file loads with keys at every frame.
On the General rollout, turn on Footstep Mode.
Select footsteps 2 and 3 and move them up in the Front or Left viewport.
The biped with keys at every frame adapts smoothly to the edited footsteps.
In the Top viewport, select footsteps 7 through 21.
On the Footstep Operations rollout, set Bend to a negative value.
The footstep path bends out. The biped adapts naturally to the footsteps.
Turn off Footstep mode.
Drag the time slider to frame 250.
On the General rollout, turn on Bend Links mode.
Turn on the Animate button.
On the Layers rollout, click Create Layer.
Rotate the spine so the character stands up straight rather than leaning back during the walk.
Click Play to view the changes, the character walks more upright.
On the Layers rollout click Collapse. This will collapse the spine editing down to the original animation. This will take some time.
Filtering the data for key reduction
On the Motion Capture rollout, click Convert from Buffer.
On the Motion Capture Conversion Parameters dialog, turn on Footstep Extraction and choose Use Key Reduction in the Conversion field. Click OK.
The raw data in the motion capture buffer is filtered with key reduction. The motion capture buffer contains the raw data buffered when the file was first read in. This data is used to either try new filter settings quickly or to paste a pose from the raw information in the buffer onto a biped with filtered data. If you plan on major editing to the motion capture data then key reduction is the way to go.
Comparing the raw and filtered data
On the Motion Capture rollout, click Show Buffer.
On the Display rollout, turn off Objects and turn on Bones.
The raw and filtered data match closely.
The raw data represented by the red stick figure closely matches the filtered data represented by the other stick figure. This motion does not contain any high frequency data (fast motion) so it is not necessary to correct the filtered motion. Later in the tutorial you'll filter a file with high frequency information and add correction.
Save your work.
Lesson 2: Comparing Trajectories