9

276 Chapter 18: Effects and Environments
is a combination of the scene and background
image’salpha.Also,whenwritingTGAfileswith
Pre-Multiplied Alpha set to off, tur ning on Use
Environment Alpha prevents incorrect results.
Note that only background images with alpha
channels or black backgrounds are supported
when compositing in other programs such as
Photoshop®.
Note: To control whether or not a background
image is affected by the renderer’s antialiasing
filter, choose Customize > Preferences >
Rendering and then turn on Filter Background in
the Background Antialiasing group. Default=off.
Fir e E nv ir onm ent E f fect
Rendering menu > Environment > Environment and
Effects dialog > Environment panel > Atmosphere rollout
>Add>FireEffect
Scene using fire
UseFiretoproduceanimatedfire,smoke,and
explosion effects. Possible uses for Fire effects
includecampfires,torches,fireballs,clouds,and
nebula.
Note: In earlier versions of 3ds Max, Fire was
know n as the "Combustion effect."
You can add any number of fire effects to a scene.
The order of effects is important because effects
near the bottom of the list are layered in front of
effects near the top of the list.
Each effect has its own parameters. When you
select a fire effect in the Effects list, its parameters
appear in the Environment dialog.
Fire renders only in Camera or Perspective views.
Orthographic or U ser views don’t render Fire
effects.
Tip: Fire doesn’t support completely transparent
objects. Set the transparency of Fire objects
accordingly. Use visibility rather than transparency
to make Fire objects disappear.
Note: TheFireeffectdoesnotcastanylightor
shadows in the scene. To simulate illumination,
you must also create lights. To cast shadows, you
need to go to the ShadowsParametersrollout(page
2–1337) of your lights, and turn on Atmosphere
Shadows.
Procedures
To create fire effects:
1. Create one or more atmospheric apparatus
objects to locate the fire effect in your scene.
2. Defineoneormorefireatmosphericeffectson
the Environment panel.
3. Assign atmospheric apparatus objects to the
fire effects.
Sample fire effects