Multiplicity

Multiplies the number of added particles. A value of 1 means that one particle is added for every sampling point on the curve you sketch.

Radius

Sets how the particles are uniformly distributed within spheres centered at each sampling point on the curve. This parameter controls the radius of those spheres: the larger the radius, the more the particles are spread out.

On the Advanced page, you can also set this parameter’s Seed value for random effects (see Particle Variance and Seed Parameters).

Speed

The speed of the particles as determined by the direction and speed at which you drag the Sketch Particles drawing tool. To see the effect of the speed after you’ve sketched the particles, select the sketched particles and choose Create > Particles > From Initial State.

This parameter also has a Var parameter so that you can produce a more random effect on the particles.

On the Advanced page, you can also set this parameter’s Seed value.

See Particle Variance and Seed Parameters for more information on these parameters.

Spread

Controls the direction of the velocity. If the Spread is zero, particles flow exactly along the velocity vector defined by the stroke you make with the Sketch Particles drawing tool.

With a value higher than zero, the particles’ velocity vector is defined within the angle of a cone (in degrees) whose axis is in line with the stroke at that point. This is similar to the Spread parameter in the Particle Emission Property Editor. The Spread value is between 0 and 180 degrees.

On the Advanced page, you can also set this parameter’s Seed value for random effects (see Particle Variance and Seed Parameters).