The Lightflow Rendering Tools
FAQ
Q: How to produce fast previews with low quality ?
A: There are many ways, that may also be combined.
The first is to turn off antialiasing, that is to say
to set "aa-threshold" to 3.0 (with pinhole cameras). This is
probably the method that provides the fastest results.
The second is to use ray-tracing caches, by setting the
"caching" parameter in the "default" interface.
This method produces fuzzy reflections and refractions but
works correctly with everything else.
The third is to turn off some features such as volumetric
rendering, shadows or displacement mapping.
This can be achieved by setting the corresponding attributes in
the "default" interface.