2008

This rollout sets parameters for the default scanline renderer on page 7918 .
NOTE If your scene includes animated bitmaps, including materials, projector
lights, environments, and so on, the animation file is reloaded once per frame. If
your scene uses multiple animations, or if the animations are themselves large
files, this can slow down rendering performance.
Environment Alpha Toggle and Filtering
To control whether or not the renderer uses the environment map's alpha
channel in creating the alpha for the rendered image, choose Customize >
Preferences >
Rendering on page 7560 , and then turn on Use Environment
Alpha in the Background group. If Use Environment Alpha is off (the default),
the background receives an alpha value of 0 (completely transparent). If Use
Environment Alpha is on, the alpha of the resulting image is a combination
of the scene and the background image's alpha channel. Also, when you render
to
TGA files on page 7162 with premultiplied alpha on page 7900 turned off,
turning on Use Environment Alpha prevents incorrect results.
You can also 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 group. Default=off.
TIP If you plan to composite 3ds Max objects in another program such as
Combustion or Photoshop, render the objects against a black background.
Otherwise, a fringe of environment or background color can appear around the
3ds Max objects.
Plate Match Filtering
This section describes the Plate Match/MAX R2 antialiasing filter (see
Antialiasing group on page 5954 for descriptions of other filtering options).
In versions of 3ds Max prior to R2.5, antialiasing affected only geometric edges,
with the filtering of bitmaps being controlled in the Bitmap Map parameters
(pyramidal, summed area, or no filtering). Current antialiasing filters affect
every aspect of the object, filtering textures along with geometric edges.
While the method used in R2.5 and subsequent versions provides superior
results, this method also produces inconsistencies when rendering objects
that are supposed to match the environment background, because the
antialiasing filters do not affect the background by default (FilterBackground=0
in the [Renderer] section of the
3dsmax.ini on page 51 file or Customize menu
> Preferences > Rendering tab > Background group > Filter Background). In
order to correctly match an object’s map to an unfiltered background image,
5950 | Chapter 18 Rendering