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44 Chapter 17: Rendering
that are out of range (0 to 1). Typically, specular
highlights can cause color components to rise
aboverangewhileusingfilterswithnegativelobes
can cause color components to be below range.
You choose one of two options to control how the
renderer handles out of range color components:
•
Clamp —To keep all color components in range
Clamp will change any color with a value
greater than 1 down to 1 while any color below
0 will be clamped at 0. Any value between 0
and 1 will not change. Very bright colors tend
to render as w hite when using Clamp since hue
information can be lost in the process.
•
Scale—To keep all color components in range
Scalewillpreservethehueofverybright
colors by scaling all three color components so
that the maximum component has a value of
1. B e aware that t his will change the look of
high lights.
Memory Management group
Co nserve Memory—When on, rendering uses less
memoryataslightcostofmemorytime.Memory
savedisintherangeof15to25percent.Thetime
cost is about four percent. Default=off.
Adva nced Li ghting wit h t he
S ca nli ne R ender er
Rendering menu > Render > Render Scene dialog
> Choose Default Scanline Renderer as the active
production renderer. > Advanced Lighting panel > Select
Advanced Lighting rollout
Main toolbar > Render Scene > Render Scene dialog
> Choose Default Scanline Renderer as the active
production renderer. > Advanced Lighting panel > Select
Advanced Lighting rollout
The Advanced Lighting rollout lets you select one
of the advanced lig hting options. Two are provided
w ith the default scanline renderer (page 3–38):
• Light Tracer (page 3–44)
• Radiosity (page 3–51)
The Light Tracer provides soft-edged shadows
and color bleeding for brightly-lit scenes such as
outdoor scenes. Radiosity provides physically
accurate modeling of the light in a scene.
Interfa ce
Until you choose an advanced lighting option, the
Advanced Lighting panel displays a single rollout,
Select Advanced Lig hting.
List of plug-ins—Choose an advanced lighting
option from this drop-down list. Default=No
advanced lighti ng chosen .
Active—When an advanced lighting option is
chosen, use Active to toggle whether the advanced
lighting is used when you render your scene.
Default=On.
Light Tracer
Main toolbar > Render Scene > Render Scene dialog
> Choose Default Scanline Renderer as the active
production renderer. > Advanced Lighting panel > Select
Advanced Lighting rollout > Choose L ig ht Tracer from the
drop-down list.
Rendering menu > Render > Render Scene dialog
> Choose Default Scanline Renderer as the active
production renderer. > Advanced Lighting panel > Select
Advanced Lighting rollout > Choose L ig ht Tracer from the
drop-down list.