Rays pass through spatquant in one of several paths.
They may pass through completely unchanged. This is useful when one
wishes to make a snapshot (i.e. an image) of the ray distribution at
some point in the ray stream without disturbing the flow of the stream.
Only those that would be binned are passed through (i.e. as in a mask
operation). Masking is useful when the bins are really apertures, with
spaces between bins which are opaque, and one wishes to process only
those rays which pass through the non-opaque parts.
They may be accumulated. Accumulating rays is appropriate when only the
weight of the rays in each bin will be used. The rays which accumulate
in a bin are represented in the output stream as a single ray with their
combined weights; all other information is discarded. This greatly cuts
down on the information flowing down the stream.
Their positions may be changed to that of the center of the bin into
which they would have been accumulated. This is useful when additional
information (such as ray energy) is needed during down stream
processing.
They may be completely blocked. This mode is only useful if you're
creating an image (see Images);