Add Visibility Track
controls when you can see an object. Visibility tracks can only
be added to objects.
You can create a visibility
track by either animating the Visibility parameter in the Object
Properties dialog or by selecting an object in the Track View Hierarchy
and clicking Tracks menu Visibility
In both cases a visibility track, using a Bezier float controller,
is created in Track View. The visibility track displays as a child
of the object in the Track View Hierarchy.
NoteIn the Object Properties
dialog, Rendering Control must be set to By Object in order to keyframe
the Visibility using the spinner.
an object in the viewports and select Properties to display the
Object Properties dialog.
WarningAn object without
mapping coordinates that is invisible at frame 0 will not ask for
UVW Map coordinates at render time. The warning will display at
the frame that the object becomes visible. This can stop a render
midway, so make sure invisible objects at the beginning of your
animation have mapping coordinates if necessary.
On and Off Visibility
When you first assign
a visibility track to an object, a Bezier float controller is automatically
assigned; this allows gradual visibility. You can make an object
appear or disappear suddenly by changing the interpolation of the
visibility keys to Step tangency.
Variable opacity is supported
in the shaded viewports. For ease of use, the object never completely
disappears from the viewports.
An object can inherit
the visibility of its parent (as determined by the parent's Visibility
track in the Track View). Use the Object Properties Inherit Visibility check
box to specify the visibility inheritance of an object.
Groups and Visibility
All members of a Group
inherit the visibility of the parent when a visibility controller
is assigned to the parent. Transparent materials and hidden objects
have no effect on this function.
Level of Detail Utility
of Detail utility lets you construct an
object that alters its geometric complexity or level of detail based
on its size in the rendered image. You create several versions of
the same object each with different levels of detail; you group
them as one, and then assign the Level of Detail utility. This automatically
creates a special LOD controller as a Visibility track.
To add a visibility track to objects:
- In Track View Curve Editor or Dope Sheet
Edit Keys mode, highlight the object you want to affect in the Hierarchy
list on the controller window.
- From the Track View Tracks menu, choose Visibility Tracks Add.
- Select the keys, then use Controller Properties to adjust
the key values and interpolation.
A value of 0 creates
an invisible object, a value of 1.0 creates a fully visible object.
Change the interpolation to step for sudden visibility, rather than
A visibility track appears
below the selected object(s). Add and edit keys in the visibility
track to control the object's visibility.
To add visibility keys:
- Once you have a visibility track assigned
to the object, highlight the track.
- On the toolbar, click (Add
- On the Track View Key window, click in
a visibility track to add a key at that time location.
Example: To create and animate a visibility
track using the Object Properties dialog:
- Create a box.
- Turn on (Auto
- Drag the time slider to frame 10.
This is the frame at
which you'll set the box to disappear.
- Right-click the box and choose Properties
from the shortcut menu.
- In the General tab, set Visibility to 0,
and then click OK.
This creates a visibility
track in Track View and adds a key with a value of 0 to the track.
- Scrub the time slider.
The box fades.