User guide
341
Control (UI) Default Value Function
shadingmodel matte Specifies a simplified shading model to use when tracing
photons. Valid strings are glass, water, chrome, matte,
transparent, refractive:ior=... (wherein the index of
refraction can be set to any number greater than or equal
to 1), dielectric, point cloud:..., brickmap:..., or absorbing.
"" means matte (the default). For volumes, valid strings
are isotropic, rayleigh, hazymie, murkymie,
henyeygreenstein:g=..., and
henyeygreenstein:g1=...,g2=...,r=.... (The last two are
single- and double-lobed Henyey-Greenstein phase
functions, with the g parameters being numbers between
-1 and 1 specifying the lobe eccentricity.) "" means
isotropic, the default for volumes.
sides
backfacetolerance 0 Specifies the angle - in degrees - beyond the silhouette
normal that a primitive must exceed before it may be
culled prior to shading.
doubleshaded No When set to Yes, two-sided primitives are shaded twice,
one on each side. Surface normals are inverted on the
second pass.
trace
maxdiffusedepth 1 Limits the number of diffuse 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 maxdiffusedepth = MIN(parent.maxdiffusedepth,
parent.diffusedepth + object.maxdiffusedepth).
5 NODES L-Q | PRMANOBJECTSETTINGS