User guide

343
Control (UI) Default Value Function
user N/A PRMan supports the use of arbitrarily defined
token/value pairs for the user attribute. These
token/value pairs may be arbitrarily defined and set, and
then queried with the attribute shadeop or via the
RxAttribute mechanism. Like other attributes, all
token/value pairs associated with this attribute will be
pushed and popped on the graphics stack with each
RiAttributeBegin and RiAttributeEnd call.
visibility
camera Yes Sets the visibility of subsequent primitives to the camera.
diffuse No Sets the visibility of the current primitive to diffuse rays.
specular No Sets the visibility of the current primitive to specular rays.
midpoint No Sets the visibility of the current primitive to the midpoint
depth filter. Options that have midpoint visibility, but no
camera visibility are considered visible when the midpoint
depth filter is active, and are included in the two surface
hider operation as second surface only (meaning they
can receive, but not cast shadows).
photon Yes Sets the visibility of the current primitive to photons.
Note: Since photon map generation is a separate render
pass, this option is largely superfluous. It is included to
facilitate the use of the same RIB for photon generation,
and final render pass.
transmission No Sets the visibility of the primitives to transmission
(shadow) rays.
volume
5 NODES L-Q | PRMANOBJECTSETTINGS