8

Light Tracer 49
Initial sam p ling uses a regular grid.
Adaptive undersampling concentratesonareasoftransition.
Tip: If you use adaptive undersampling, try
adjusting the Subdivision Contrast value to obtain
the best results. The effec t of this control depends
on the value of Rays/Sample.
Adaptive Undersampling—When on, the Light
Tracer uses undersampling. When off, it samples
every pixel. Turning off undersampling can
increase the detail of the final render ing, but at a
cost of rendering time. Default=on.
Initial Sample Spacing—The gr id spacing for the
initial samples of the image. This is measured in
pixels. Default=16x16.
Initial sample spacing values
Subdivision Contrast—The contrast threshold
that determines when a region should be f urther
subdivided. Increasingthisvaluecausesless
subdividing to occur. Too small a value can cause
unnecessary subdividing. D efault=5.0.
Decreasing the subdivision contrast threshold can reduce
noise in soft shadows and bounced lighting.
Subdivide Down To—The minimum spacing for a
subdivision. Increasing this value can improve
render time at a cost of accuracy. Default=1x1.
Depending on the scene geometry, g rids larger
than 1x1 might st i l l be subdivided b elow this
specified threshold.
Show Sa mples—When on, sample locations render
as red dots. This shows where the most sampling
has taken place, w hich can help you choose the
optimal settings for undersampling. Default=off.