The RenderMan Interface - Paul Bourke

A particular renderer implementation may also choose to provide additional built-in
filters. The standard filters are described in Appendix E.
A high-resolution picture is often computed in sections or panels. Each panel is a
subrectangle of the final image. It is important that separately computed panels join
together without a visible discontinuity or seam. If the filter width is greater than 1
pixel, the rendering program must compute samples outside the visible window to
properly filter before sampling.
RIB BINDING
PixelFilter type xwidth ywidth
The type is one of: ”box”, ”triangle”, ”catmull-rom” (cubic), ”sinc”, and ”gaussian”.
EXAMPLE
RiPixelFilter (RiGaussianFilter, 2.0, 1.0);
PixelFilter ”gaussian” 2 1
SEE ALSO
RiPixelSamples, RiPixelVariance
RiExposure ( RtFloat gain, RtFloat gamma )
This function controls the sensitivity and nonlinearity of the exposure process. Each
component of color is passed through the following function:
RIB BINDING
Exposure gain gamma
EXAMPLE
Exposure 1.5 2.3
SEE ALSO
RiImager
color = (color · gain) 1/gamma
RiImager ( RtToken name, ...parameterlist...)
Select an imager function programmed in the Shading Language. name is the name
of an imager shader. If name is RI NULL, no imager shader is used.
RIB BINDING
Imager name ...parameterlist...
EXAMPLE
RiImager (”cmyk,” RI NULL);
SEE ALSO
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