User guide

342
Control (UI) Default Value Function
maxspeculardepth 2 Limits the number of specular bounces for indirect
illuminance, relative to the associated primitive. To
resolve the interaction between per-primitive values
when different objects have different values of these
attributes, the current max is passed down the ray tree,
then maxspecularepth = MIN(parent.maxspeculardepth,
parent.speculardepth + object.maxspeculardepth).
displacements 0 Controls whether true displacements appear in ray-
traced results. When set to 0, displacements are
disregarded for ray-primitive intersection tests, but are
used for shading, resulting in a bump mapped
appearance. When set to 1, displacements are applied
before ray-primitive intersection tests. When set to 2,
surfaces are only displaced when near the ray origin, or
when the ray differential is narrow.
bias 0.01 An offset applied to ray origins, moving them away from
the surface launch point, in the ray direction.
samplemotion 0 Controls whether motion blurred objects appear in ray-
traced results. When set to 0, the motion blur of other
objects hit by rays launched from an object with this
attribute are ignored. When set to a non-zero value,
motion blur is taken into account by rays launched from
an object with this attribute.
importancethreshold 0.001 Rays with importance below this value are not traced.
decimationrate 1 Sets the tessellation decimation rate for ray tracing.
When set to 2 or higher, the surface tessellation used for
ray tracing is coarser than the dicing used for Reyes
rendering of directly visible surfaces.
user
5 NODES L-Q | PRMANOBJECTSETTINGS