User guide

338
Control (UI) Default Value Function
derivatives
centered Yes Sets whether or not derivatives are calculated symmetric
with respect to the (u,v) parameterization. This setting
only takes effect when smooth shading is enabled.
extrapolate Yes Sets whether or not derivatives are extrapolated. This
setting only takes effect when smooth shading is
enabled.
dice
binary No A flag that sets whether the lowest level patches must be
diced into micropolygons with power of two dimensions.
hair No Specifically used for RiCurves geometry to make curves
that span multiple buckets cheaper to shade and more
memory efficient. When enabled Du() of any quantity is
0, with the exception Du(u) =1. This means that
derivatives across the width of curves are ill defined.
Therefore, this option should only be used for hair-like
(i.e. very thin) curves.
rasterorient Yes When set to Yes, uses oriented, rather than nonraster
oriented dicing.
strategy planarProjection Selects the dicing strategy. Under the default
planarProjection dicing rate is determined using the
screen space coordinates of a primitive, projected onto a
plane. The sphericalProjection strategy uses the
coordinates of a primitive projected onto a sphere, and
worldDistance uses Euclidian distances measured in
world space units.
Note: When using the worldDistance strategy, the dicing
camera is ignored.
5 NODES L-Q | PRMANOBJECTSETTINGS