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If incompatible options are given to mental ray, some of them are
overridden to return to a consistent state. In mental ray 1.9.9.20 and
higher, including mental ray 2.x, the strategy was changed: instead of
re-enabling ray tracing if any other feature such as lenses are used
and ray tracing was explicitly turned off, the newer versions do not
turn ray tracing back on but change the operation of the feature
normally requiring ray tracing. The following features are affected:
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If ray tracing is turned off, lens shaders cannot modify the ray origin
and direction. Lens shaders are still useful in this mode because they
can modify the color returned by the eye ray, or decide to not sample
points in certain directions.
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A new algorithm was introduced in mental ray 2.x that supports fast
motion blur in scanline mode. Turning ray tracing off no longer
disables motion blurring.
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Similarly, shadow maps were introduced that support shadows in scanline
mode. Only opaque shadows are supported in this mode; transparent and
transparency-mapped shadows still require ray tracing. Shadow maps do
support motion-blurred shadows.
Copyright 2000 by mental images