And to illustrate that:
http://www.lamrug.org/resources/samplestips.html
middle of the page.
Halfdan Ingvarsson wrote:
The filter size *does* have a say in how many samples are taken. If
the filter needs samples that lie outside of the tile boundary, more
samples will be taken for that tile even if they overlap what has
already been sampled in surrounding tiles. Sample data is not shared
between tiles.
With a scene where min/max sample is zero, if your tile size is set to
32, and the filter size is set to 1x1, the number of samples is 1089,
which corresponds to 33 x 33 pixel corner samples. If you whack the
filter size to 3x3, the number of samples goes to 1225, which
correspomds to 35 x 35 corner samples (1 extra pixel on each side,
since that's what the filter now covers from the pixel center).
You see, the scene is sampled at pixel corners but filtered at pixel
centers, with x and y filter size controlling the width and height of
the filter (not radius!) This is the main reason as to why it is not
possible to get a non-filtered output from mental ray (is that a
double negative?).
- ½
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