There is a new function filterstep() in the shading
contexts.
In the shading contexts, there are new functions to query the
ray-tree. Please see documentation for getraylevel()
and getrayweight().
There is a new function available for surface shaders to
determine whether the shader is being evaluated for shadow
opacity (vs. being evaluated for surface color). Please see
documentation for isshadowray().
The angles specified in illuminance() constructs are
now interpreted correctly.
OP Context Changes
The npoints() function is new for the SOP context.
The getbbox() function is new for the SOP/POP context.
The import() function in SOPs has been extended to
take an optional point number. If the point number is not
specified, then the function behaves as before (i.e. the value
for the current point number is retrieved).
A new function (optransform()) can be used to
evaluate the transform associated with an object in the OP
contexts.
In the CHOP context, there are new functions to query units,
and channel start and end times: