The Level of Detail
(LOD) helper lets you specify objects with varying face counts that
are appropriate for different viewing distances. Browsers display
the less detailed objects when the viewer is far away from them
and substitute the more detailed objects at closer ranges.
Use LOD objects to speed
up rendering of scenes in which highly detailed objects are often
far away from the viewer.
Objects used for LOD
do not have to be of the same type or size, so you can accomplish
a crude form of morphing by using different objects as the LOD components.
For example, a tree might seem to grow if taller trees with more
limbs are substituted as the viewer gets closer.
To create a Level of Detail helper object:
- Create the objects to which you want
to add level of detail.
- Click the LOD button.
- Click and drag in the scene to create
a helper object.
- Add the objects to the list with Pick
- Use the Hide and Unhide commands, or
the H key, to help pick the objects
and add them to the LOD list.
- Select the objects in the list and use
the Distance spinner to set the distance.
To create all the objects and the LOD
helper object at exactly the same coordinates:
- Create the LOD helper object.
- You can use Snap and create the helper
object at the origin (0,0,0 coordinates), or use the Keyboard Entry
rollout for a Standard Primitive to specify an exact object origin.
- Create the object with the most detail
at the same coordinates. Name it (for example, hicapsule).
- Choose Edit/Clone.
In the Clone Options
dialog, choose Copy and name the new object (for example, medcapsule).
- Repeat step 3 to create the other objects
(for example, locapsule).
For the medium and low
resolution objects, apply an Optimize modifier to reduce the face
For primitives, you can
reduce the face count by changing the creation parameters in the
The Level of Detail rollout
contains the following options:
- Pick Objects
Selects objects of different
face counts to substitute for the LOD helper object. Create all
the objects and the LOD helper object at exactly the same coordinates.
Sets the distance from the
camera at which the user sees the selected object. The distance
specified for the object appears next to the object name. For example:
hicapsule - 100 medcapsule
- 300 locapsule − 500
Hicapsule is displayed
when the distance between it and the camera is within 100 units.
The lower resolution object (medcapsule) is displayed when the camera
is between 100 and 300 units. The lowest resolution object (locapsule)
is displayed when the camera is beyond 300 units. The greatest distance
(500 in this case) is not actually used, but must be supplied.
Deletes the selected object
from the list.
- Icon Size
Sets the size of the
LOD helper object.