Tutorial 6 - Tracking & Special Effects
1 Click for larger view
2 Click for larger view
3 Click for larger view
4 Click for larger view
Open the Flow that was saved at the end of the Transformation
Effects tutorial. To add the Hotspot tools needed to produce
the effect, from the toolbar, drag a Hotspot tool onto the Flow
between Transform 2 and the Saver. Right click on the tool,
choose Rename, and call the tool Left. Drag another Hotspot
tool onto the Flow after the first one, and rename it Right.
Open the Control Header for Left: Drag the Primary Strength
slider all of the way to the left. Do the same for Right.
It is not necessary to track the gun barrels all of the way
through the shot. They will not be in firing position until
at least frame 54, and will stop firing by frame 115. Advance
the Time slider to frame 54.
Select the Saver, right click and select View On: Large.
Select Left. Click on the center for Left, and with the mouse
cursor, move the center so it is on top of the gun barrel of
the soldier on the left side. You may need to zoom in on the
Small View to see this.
Right click on the center crosshairs for Left, choose Left:
Primary Center, and select Path.
Using the keyboard scrub hotkeys ([ and ]), advance 5 frames.
Click on where the muzzle is now to set the next point of the
Continue advancing 5 or so frames, making a new point until
frame 115. (Fig 2)
Repeat the same procedure, but this time track the right-hand
soldier's gun barrel with your Hotspot Right's center, starting
at frame 54, and ending at 115.
Now that both Hotspots will follow their respective gun barrels,
we need to simulate the flashes. Return to frame 54. Open the
Control Header for Left and right click on the slider marked Primary
Strength. Choose Bezier Spline.
To keep the flashes rapid, only a frame or two long, scrub forward
to frame 60. Move the Primary Strength slider to the right slightly.
Advance two more frames, and move the slider over to 1.2. Advance
another two frames, and return the slider to zero.
In this manner, go through the footage, creating random bursts
of light from both of the guns, until frame 115. Repeat this for
both of the Hotspot tools. (Fig 3)
For fine editing of the muzzle flashes, click on the view selector
at the top to open the Spline Editor. Select the spline attached
to the Primary Strength of either Right or Left, and you may adjust
the keypoints in terms of timing, or strength. (Fig 4)
You have now completed this sequence. If you wish, click on the
Saver, and output the sequence to either an AVI, a Targa or DPS
media file. It is important to note that when rendering out for
eventual burn to tape, click on the Legal tab in your Saver tool,
choose your video format (NTSC/PAL), and tell it to adjust colors
to 'legal'. This will keep all color ranges within the proper
gamut for your format, and will avoid tearing, bleeding and ghosting
when you finally go to tape.