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that corresponds to one of the sub-materials, the sub-material doesn't appear.
However, the operator can use it to calculate the density of particle placement.
The software assumes the material to be applied to the entire object surface.
Mtl ID Specifies the material ID of the sub-material to be used for particle
emission.
Separation When on, the software attempts to keep the particles apart by the
amount specified in Distance. The likelihood of successfully separating particles
depends on the number of particles, the specified distance, and the Attempts
Max value.
Distance Specifies the distance, in system units, by which the software should
try to keep the particles separate. Default=1.0.
Distinct Points Only Limits emission to a specific number of points (see Total,
below) on the specified Location type.
Emission points are still randomized; change the Uniqueness setting to alter
these.
Total Sets the number of emission points. Available only when Distinct Points
Only is on. Default=10.
If Location Is Invalid group
Delete Particles When on, if the software cannot place a particle according
to the current option, it deletes the particle. When off, particle placement is
undefined; that is, it depends on other variables. Default=off.
If the number of particles is more important than the position on the object,
leave this off. However, if exact placement is of higher priority than the
number of particles, turn Delete Particles on.
Uniqueness group
The Uniqueness setting enables randomization of placement on the emitters.
Seed Specifies a randomization value.
New Calculates a new seed using a randomization formula.
Attempts Max When using the Separation option, this specifies the maximum
number of times Particle Flow will try to set particle positions that maintain
the requested distance. If unsuccessful within this number of attempts, particles
might be closer together than the requested distance. Also affects placement
with Density By Material using either of the Grayscale options.
2860 | Chapter 14 Space Warps and Particle Systems