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38 Chapter 17: Rendering
Default Scanline Renderer
Main toolbar > Render Scene > Render Scene dialog >
Choose Default Scanline Renderer as the active draft or
production renderer. > Renderer panel > Default Scanline
Renderer rollout
Rendering menu > Render > Render Scene dial og >
Choose Default Scanline Renderer as the active draft or
production renderer. > Renderer panel > Default Scanline
Renderer rollout
This rollout sets parameters for the default scanline
renderer (page 3 –1006).
Note: If your scene includes animated
bitmaps, including materials, projector lig hts,
environments, and so on, the animation file
isreloadedonceperframe. Ifyoursceneuses
multiple animations, or if the animations are
themselves large files, this ca n slow down
rendering performance.
Envi r onment A lph a Toggle a nd Fil ter ing
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 (page 3–826),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
UseEnvironmentAlphaison,thealphaofthe
resulting image is a combination of the scene and
the background image’s alpha channel. Also,
when you render to TGA files (page 3–633) with
premultiplied alpha (page 3–997) 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,andthenturnonFilterBackgroundin
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 Ma tch Filtering
This section describes the Plate Match/MAX R2
antialiasing filter (see Antialiasing group (page
3–40) 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 (page 1–18) 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,youneedtousethePlateMatch/MAX
R2 filter so the texture is not affected by the
antialiasing.
There are three wa ys you can render objects to
blend seamlessly into a background environment:
• Assign a matte/shadow material (page 2 –1584).
• Assign a 100% self-illuminated diffuse texture
to an object using Camera Mapping (page
1–567).