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Coordinate system of the Coordinates parameter below.
Specify location as X, Y, and Z coordinates.
Specify location as radius, theta, and Z coordinates (where theta is the angle between the X and Y axes).
Specify location as radius, theta and phi coordinates (where phi is the angle between the X and Z axes).
Location in space to emit particles from.
This operator has two methods for emitting particles. You can use these methods together or separately:
Impulse creates a certain number of particles each time the node cooks.
Constant creates a certain number of particles per second.
Turns impulse emission on and off. Impulse emits the number of particles in the Impulse birth rate below each time the operator cooks. A value of 0 means off, any other value means on.
Impulse Birth Rate
Number of particles to emit each time the node cooks (when Impulse activation is on).
Turns constant emission on and off. Impulse emits the number of particles in the Constant birth rate below each second. A value of 0 means off, any other value means on.
Const. Birth Rate
Number of particles to emit per second (when Constant activation is on).
Name of a group to put the new points into.
If the Birth group already exists, append the new particles to the group instead of replacing its contents.
How long the particle will live (in seconds).
Particles will live the number of seconds in Life expectancy, plus or minus this number of seconds. Use 0 for no variance.
The parameters on this tab let you control which and how attributes are initialized on the emitted particles. See the POP locals page for explanations of these variables.
Set or add to velocity attribute.
Variance to velocity set above. The node will add +/- from 0 to this number along each axis to the Velocity parameter.
By default, the variance (if any) is distributed in a box, the size of which is determined by the Variance parameter. When this option is on, the variance is distributed in an ellipsoid instead.
Add ID Attributes
Add ID and parent attributes to the created particles.
Add Generation Attribute
Add the generation attribute to the created particles.
Add Origin Attribute
Add the origin attribute to the created particles. The origin attribute holds an arbitrary number that can help you identify the source of a particle.
Value for the origin attribute (when Add origin attribute is on).
Add Speed Attribute
Add speed attribute. In Houdini, the speed attribute is the length of the velocity vector.
TX, TY, TZ
The following examples include this node.