2012

Work with Keyframes
Keyframes are used to define position and properties of the changes made to
the model.
See also:
Edit Key Frame Dialog Box (page 748)
Capture Keyframes
New keyframes are created by clicking Capture Keyframe
on the
Animator toolbar. Every time you click this button, Autodesk Navisworks
adds a keyframe of the currently selected animation set, camera, or section
plane set at the current position of the black time slider.
Conceptually, keyframes represent relative translations, rotations and scaling
operations from the previous keyframe or, in the case of the first keyframe,
the model’s starting position.
Keyframes are relative to each other and to the model’s starting position. This
means that if an object is moved in the scene (when, for example, a new
version of the model is opened, or if movement tools are used in Autodesk
Navisworks), the animation is done relative to the new starting location rather
the animation’s original start position.
The translation, scaling and rotation operations are cumulative. This means
if a particular object is in two animation sets at the same time, both sets of
operations are carried out. So if both are translating across the X axis, for
example, the object will move twice as far.
If there is no keyframe at the start of the timeline for an animation set, camera,
or section plane set, then the very start of the timeline acts like a hidden
keyframe. So, for example, if you have a keyframe a few seconds in, and the
frame has the Interpolate option enabled, then over those first few seconds
objects would interpolate between their default starting position and those
defined in the first keyframe.
Edit Keyframes
You can edit captured keyframes for animation sets, cameras, and section
plane sets.
538 | Chapter 12 Animate Objects