9

Volume Fog Environment Effect 285
3.
Under Atmosphere on the Environment panel,
click Add.
TheAddAtmosphericEffectdialogisdisplayed.
4. Choose Volume Fog, and then click OK.
5. Set the parameters for volume fog.
Note: If there are no objects in your scene,
rendering shows only a solid fog color. Also,
with no object s and Fog Backg round turned
on, volume fog obscures the background.
To crea te a volume f og gi zmo:
Volume fog gizmo surrounds the scene.
1. IntheHelperscategoryoftheCreatepanel,
choose At mospheric Apparatus from the
pop-up menu.
2. Click one of the buttons to choose a gizmo
shape: SphereGizmo, CylGizmo, or BoxGizmo.
3. Drag the mouse in the viewport to create the
gizmo.
You create Gizmos in much the same way as
their matching geometry types. Dr ag the mouse
to create the initial dimensions. The Sphere
gizmo has an additional Hemisphere check box
that turns the sphere into a hemisphere.
In addition, each gizmo has a Seed spinner
and a New Seed button. Different seed va lues
generate different patterns. Clicking the New
Seed button randomly generates a new seed
value for you.
To a ssi gn volume fog to a gi zmo fr om an a ppar atu s
modi f y pa n el:
1.
Open the Modify panel of an apparatus.
2. Open the Atmospheres & Effects rollout.
3. Click Add.
4. Select Volume Fog from the Add Atmospheres
dialog and click OK.
5. Highlight Volume Fog from the Atmospheres
list and click setup to adjust the Volume Fog
parameters.
To assign a gizmo to volume fog from the
Envi ronment pan el:
1.
OntheVolumeFogParametersrollout,click
the Pick Gizmo button.
2. Click a gizmo in the viewport.
The name of the gizmo appears in the list field
at right.
When you render, the volume fog will be
confined to the shape of the g izmo.
To r emove an assigned gizmo:
1.
In the Environment dialog, go to the Volume
Fog Parameters rollout
2. Select the gizmo name f rom the pop-up list.
3. Click Remove Gizmo.
This a ction doesn’t delete the gizmo from t he
scene, but simply unbinds it from the fog effect.