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296 Chapter 18: Effects and Environments
scanline renderer. When you use standard lights
but leave Affect Indirect Only off, radiosit y and
exposure control yield results that can be quite
different from the default scanline renderer.
In general, you don’t nee d to turn on Affect
Indirect Only when the primary lighting for your
scene comes from photometric lights.
Exterior daylight—When on, converts colors for an
outdoor scene. Default=off.
The exterior daylight setting compensates for the extreme
intensity of an IES sun light.
Pseudo Col or E x posur e Contr ol
Rendering menu > Environment > Environment and
Effects dialog > Environment panel > Exposure Control
rollout > Choose Pseudo Color Exposure Control from the
list. > Pseudo Color Exposure Control rollout
P seudo Color Exposure Control is actually a
lighting analysis tool that provides you with an
intuitive way of visualizing and evaluating the
lighting levels in your scenes. It maps
luminance
(page 3–1058)
or
illuminance (page 3–1049)
values to pseudo colors that show the brightness
of the values being converted. From darkest to
brightest, the rendering shows blue, cyan, green,
yellow, orange, and red. (Alternatively, you can
choose a grayscale w here the brightest values are
white, and the darkest are black.) T he renderi ng
includes the colored or grayscale spectrum bar as
a legend for the image.
Note: You can use the Pseudo Color exposure
control with the
mental ray renderer (page 3–77)
.
Pseudo color exposure of a scene w ith radiosity. Areas in
red are overlit, areas in blue are underlit, and areas in green
have a good lighting level.
If you render a scene using this exposure control,
aspecial
render element (page 3–133)
named
Illuminance is created in order to obtain accurate
luminance and illuminance data.
Tip: Ifyougetafilewriteerrorwhenyoutryto
render a pseudo color image, check the path
and file name of the Illuminance element, or
thepermissionsofthePNGfilethatsavesthe
illuminance data.
Three spheres at an equal distance fro m a light source. The
sphere on the left has a matte material, the sphere in the
middle is glossy, and the sphere on the right is glossy but
has a much darker color.