Getting Started
with VNS 3: Animation
Basics
Part 2C. Changing Keyframes
1. What if we want the 20
second animation to cover 10 seconds? That's where Scale
Key Frames  comes
in. One place to access it is from the Animation Toolbar, to
the left of the Timeline button.
2. Since Main Camera Longitude
is still active and we're in Group mode, the Scale
Key Frames window opens up ready to scale the camera position
group.
3. In the Key Frames section,
scale All Frames to the range from 0 to 10
seconds. Operate to scale the frames.
4. If we go back to time 0 by
entering it into the frame counter, go to the Next keyframe
now jumps to 10 seconds, not 20.
5. Let's access Scale Keyframes
from the Camera Editor this time. Select Animation Operations
 beside any of the position parameters
in the Main Camera Editor
and select Scale Keyframe(s).
6. To scale the animation back
to 20 seconds, choose All Frames, enter an upper range
value of 20 seconds, and Operate.
7. Return to time 0, jump to
the next keyframe at 20 seconds, and you'll see that we're back
where we started.
8. Let's change the camera path
midway through the animation. Enter 10 into the frame
counter and Enter to jump to 10 seconds.
9. Select one of the Main
camera position parameters in the Scene-at-a-Glance to activate the camera, if it isn't already active.
10. Enable Move Mode  on the Icon Toolbar and
drag the camera south of its current position in the Island
Planimetric view.
11. Go to the Camera Editor and drop the elevation to 2000
meters.
12. Create a key.
13. Save the project, go back
to time 0, and play the animation. It looks like we dropped the
elevation too much because we're flying through the foreground
ridge. You can use the forward and back arrow key on the keyboard
to "scrub" through the animation one frame at a time.
14. That keyframe turned out
to be a bad idea. Select Animation Operations and Delete
Key(s).
15. We're in Key Frame Group
mode, so it defaults to operate on the Main Camera Group,
which is what we want. We're going to Remove Key Frame
for the Main Camera Latitude (deg) Group, operating on
a Single Frame at 10 seconds. Operate. This
will return us to the original camera path with keyframes at
0 and 20 seconds. Save the project.
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