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602 Chapter 20: Managing Scenes and Projects
Spatialize—
Makes the sound 3D. A spatial sound
has a particular source location in the scene. If this
box is turned off, the sound is ambient.
Min Back/Front, Max Back/Front—Displays red and
blue ellipsoids tha t allow you to set the area of the
sound effect. Inside the blue ellipsoid, the sound is
atfullvolume.Outsidetheredellipsoid,thesound
is inaudible. B etween the blue and red ellipsoids
is a falloff area in which the volume varies in
intensity.
Pick Audio Clip—Lets you choose an audio clip.
Click this button, then click an AudioClip helper
object. The audio clip must already be in the scene
andhaveasoundfileassociatedwithit.
Icon Size—D eterm ines the size of the helper in the
scene.
LOD VRML97 Helper
Create panel > Helpers > VRML97 > Object Type rollout
>LOD
The L evel of Detail (LOD) helper lets you
specify objects with varying face counts that
are appropriate for different viewing distances.
Brow sers display t he 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 w h ich highly detailed objects are often far away
from the viewer.
Objects used for LOD do not have to be of the
same t ype 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 g row if taller t rees with more limbs are
substituted as the viewer gets closer.
Procedures
To create a Lev el of Deta il hel per obj ect:
1.
Create the objects to which you want to add
level of detail.
2. Click t he LOD button.
3. Click and drag in the scene to create a helper
object.
4. Add the objects to the list with Pick Objects.
5. Use the Hide and Unhide commands, or the H
key, to help pick the objects and add them to
the LOD list.
6. Select the objects in the list and use the Distance
spinner to set the distance.
To create al l the objects a nd the LOD hel per obj ect at
exactly the same coordinates:
1.
Create the LOD helper object.
2. 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.
3. Create the object with the most detail at the
same coordinates. Name it (for example,
hicapsule).
4. Choose Edit/Clone.
In the Clone Options dialog, choose Copy
and name the new object (for example,
medcapsule).
5. Repeat step 3 to create the other objec ts (for
example, locapsule).
For the medium and low resolution objects,
apply an Optimize modifier to reduce the face
count.
Forprimitives,youcanreducethefacecount
by changing the creation parameters i n the
modifier stack.