Timeline FX: Axis -- Tracking & Stabilizing

Uploaded by SmokeHowTos on 11.06.2012

In the previous video, we covered animation and
Let’s pick up from where we left off and track the keyed source over the background.
The segment on the selected layer has an axis effect that is performing the key.
If you want to track the image to the background, you can also do this through the same axis timeline FX.
Go into the editor and right in the middle of the controls, you will see a button labeled STABILIZER.
The stabilizer is Smoke’s 2D tracker.
The options beneath the stabilizer are set up depending on the task.
In this case, the Stabilizer is set to track, and with Rotation and Scale turned off, Smoke will only track position.
Go to frame 1 and ensure you are using with the LAYER Transformations.
You can click the stabilizer button to enter into the tool.
In the viewer, click and drag the center of the tracker boxes to position them over a part of the gladiator’s uniform.
If you’ve never used a tracker before, all you need to know is that the inner box is the region being tracked,
and the outer box is the zone in which you predict the tracked region will move to in the coming frames.
Pressing the Analyze button will start the track and you can see the track path being created.
There are plenty of controls to tweak for more challenging tracks however in this case the track was straightforward.
Press the return button and you go back to the Axis menus and the tracking data is applied to the surface object.
You can see the animation in the X and Y position sliders if you were to scrub the time-bar.
The graphic has been centered over the tracking point that was used to analyze the background.
To reposition the graphic to wherever you want, you need to change from the layer transformations
to the off-set transformations.
You are basically working on another level of animation beneath the tracking data.
I’ll scale down the image object and reposition it to the screen right of the gladiator’s face.
Once the positioning is done, you can scrub the time-bar to see how the tracking is working with the added position off-set.
Coming back out to the sequence, you can scrub the result as well as render it to have a final result.
The next shot in the sequence is the opposing gladiator.
This gladiator raises his sword but there is a slight camera movement that I would like to eliminate.
You can use the same tracking tools to do stabilisation but in a slightly different way.
Select the segment and add an axis timeline FX using the FX ribbon.
In the editor, you can change the setting beneath the stabilizer button.
Just by changing the pull-down menu from TRACK to STABILIZE will apply the tracking data differently.
Inside the stabilizer, Go to frame 1 and click the center of the tracker boxes and position it on a point in the background.
Press the Analyze button and let the software do the work.
If you press Return to exit the tracker and scrub the time-bar, you can see that the image is stabilised on the chosen point.
All that is left is to do is reposition the surface object to fit the frame so you don’t get any black edges.
You need to switch from the LAYER transformations to the OFFSET transformations again.
I’ll scale the layer up slightly to fit into the frame.
You can scrub the time-bar and see the effect.
Exiting back to the sequence and rendering the result will give you your final output in the context of your edit.
In the next video, you’ll have a look at the keying tools in the Axis Timeline FX and a workflow to pull a great key.