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Spin The rate at which fragments rotate, in revolutions per second. This is
also affected by the Chaos parameter (which causes different fragments to
rotate at different speeds), and by the Falloff parameter (which causes the
force of the explosion to be weaker the farther the fragment is from the bomb).
Falloff The distance from the bomb, in world units, of the effect of the bomb.
Fragments past this distance are not affected by the Strength and Spin settings,
but are affected by the Gravity setting.
For example, this is useful for blowing up the base of a building, and having
the top of the building topple. To see the effect, place a bomb at the base of
a tall cylinder with many height segments, and adjust Falloff to be less than
the height of the cylinder.
Falloff On Turn on to use the Falloff setting. The falloff range appears as a
yellow, tri-hooped sphere.
Fragment Size group
These two parameters define the number of faces per fragment. Any given
fragment will have a number of faces, randomly determined, between the
Min and Max values.
Min Specifies the minimum number of faces per fragment to be randomly
generated by the "explosion."
Max Specifies the maximum number of faces per fragment to be randomly
generated by the "explosion."
General group
Gravity Specifies the acceleration due to gravity. Note that gravity is always
in the direction of the world Z axis. You can have negative gravity.
Chaos Adds random variation to the explosion to make it less uniform. A
setting of 0.0 is totally uniform; 1.0 is a realistic setting. A value greater than
1.0 makes the explosion extra chaotic. Range=0.0 to 10.0.
Detonation Specifies the frame at which the bomb goes off. Bound objects
are unaffected before this time.
Seed Change to alter randomly generated numbers in the bomb. You can
achieve a different bomb effect by changing Seed while maintaining the other
settings.
Although you can animate strength and gravity, the equations used for
projectile motion assume they are constant. Therefore, the motion will not
2792 | Chapter 14 Space Warps and Particle Systems