2009

about the numbers. So you could, for instance, work in inches. However, for
realistic (or at least predictable) results, it's important to be consistent. So, for
instance, if you're working in meters, make sure gravity is set to an appropriate
value in meters. To produce Earth-like gravity, use 9.8 m/s2. Otherwise objects
might appear to fall faster or slower than you expect.
NOTE Due to CPU floating-point precision, a physics engine is most accurate
when dealing with numbers as close in magnitude to 1 as possible. In other words,
values like 10,000,000 work poorly, as do values like 0.0000001. Therefore, for
real-world scenes, when creating objects of 1*1*1 size it is most useful to be
working in meters or feet, rather than centimeters/inches or kilometers/miles, in
that you most often simulate objects larger than sugar cubes and smaller than
football fields. It is for this reason that the default values in many physics engines
are usually specified in meters.
Special Features in reactor
A number of reactor features enhance speed and usability. The software lets
you create new and better animations that were virtually impossible without
reactor, and you can set up those animations in an efficient, intuitive way.
Here we present some of the main features in reactor.
Two Simulation Engines
From the reactor utility interface, you can choose to run your simulation with
either of two engines: Havok 1 or Havok 3.
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