volumeAxis

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Synopsis

volumeAxis [-alongAxis float] [-aroundAxis float] [-attenuation float] [-awayFromAxis float] [-awayFromCenter float] [-detailTurbulence float] [-directionX float] [-directionY float] [-directionZ float] [-directionalSpeed float] [-invertAttenuation boolean] [-magnitude float] [-maxDistance linear] [-name string] [-perVertex boolean] [-position linear linear linear] [-torusSectionRadius linear] [-turbulence float] [-turbulenceFrequencyX float] [-turbulenceFrequencyY float] [-turbulenceFrequencyZ float] [-turbulenceOffsetX float] [-turbulenceOffsetY float] [-turbulenceOffsetZ float] [-turbulenceSpeed float] [-volumeExclusion boolean] [-volumeOffset linear linear linear] [-volumeShape string] [-volumeSweep angle] selectionList

volumeAxis is undoable, queryable, and editable.

If fields are created, this command returns the names of each owning shape and of the field shapes themselves. If a field was queried, the results of the query are returned. If a field was edited, the field name is returned.

If no object names are provided but the active selection list is non-empty, the command creates a field for every object in the list. If the list is empty, the command defaults to -pos 0 0 0. A volume axis field can push particles in four directions, defined with respect to a volume: along the axis, away from the axis or center, around the axis, and in a user-specified direction. These are analogous to the emission speed controls of volume emitters. The volume axis field also contains a wind turbulence model (different from the turbulence field) that simulates an evolving flow of liquid or gas. The turbulence has a build in animation that is driven by a connection to a time node.

The transform is the associated dependency node. Use connectDynamic to cause the field to affect a dynamic object.

If fields are created, this command returns the names of each of the fields. If a field was queried, the results of the query are returned. If a field was edited, the field name is returned.

If object names are provided or the active selection list is non-empty, the command creates a field for every object in the list and calls addDynamic to add it to the object. If the list is empty, the command defaults to -pos 0 0 0.

Setting the -pos flag with objects named on the command line is an error.

Return value

In query mode, return type is based on queried flag.

Flags

Long name (short name)	Argument types	Properties
-alongAxis(-alx)	float
Initial velocity multiplier in the direction along the central axis of the volume. See the diagrams in the documentation.
-aroundAxis(-arx)	float
Initial velocity multiplier in the direction around the central axis of the volume. See the diagrams in the documentation.
-attenuation(-att)	float
Attentuation rate of field
-awayFromAxis(-afx)	float
Initial velocity multiplier in the direction away from the central axis of the volume. See the diagrams in the documentation. Used only with the cylinder, cone, and torus volumes.
-awayFromCenter(-afc)	float
Initial velocity multiplier in the direction away from the center point of a cube or sphere volume. Used only with the cube and sphere volumes.
-detailTurbulence(-dtr)	float
The relative intensity of a second higher frequency turbulence. This can be used to create fine features in large scale flows. Both the speed and the frequency on this second turbulence are higher than the primary turbulence. When the detailTurbulence is non-zero the simulation may run a bit slower, due to the computation of a second turbulence.
-directionX(-dx)	float
x-component of force direction. Used with directional speed.
-directionY(-dy)	float
y-component of force direction. Used with directional speed.
-directionZ(-dz)	float
z-component of force direction. Used with directional speed.
-directionalSpeed(-drs)	float
Adds a component of speed in the direction specified by the directionX, Y, and Z attributes.
-invertAttenuation(-ia)	boolean
If this attribute is FALSE, the default, then the attenuation makes the field's effect decrease as the affected point is further from the volume's axis and closer to its edge. If the is set to TRUE, then the effect of the field increases in this case, making the full effect of the field felt at the volume's edge.
-magnitude(-m)	float
Strength of field.
-maxDistance(-mxd)	linear
Maximum distance at which field is exerted. -1 indicates that the field has no maximum distance.
-name(-n)	string
name of field
-perVertex(-pv)	boolean
Per-vertex application. If this flag is set true, then each individual point (CV, particle, vertex,etc.) of the chosen object exerts an identical copy of the force field. If this flag is set to false, then the froce is exerted only from the geometric center of the set of points.
-position(-pos)	linear linear linear
Position in space (x,y,z) where you want to place a gravity field. The gravity then emanates from this position in space rather than from an object. Note that you can both use -pos (creating a field at a position) and also provide object names.
-torusSectionRadius(-tsr)	linear
Section radius for a torus volume. Applies only to torus. Similar to the section radius in the torus modelling primitive.
-turbulence(-trb)	float
Adds a force simulating a turbulent wind that evolves over time.
-turbulenceFrequencyX(-tfx)	float
The repeats of the turbulence function in X.
-turbulenceFrequencyY(-tfy)	float
The repeats of the turbulence function in Y.
-turbulenceFrequencyZ(-tfz)	float
The repeats of the turbulence function in Z.
-turbulenceOffsetX(-tox)	float
The translation of the turbulence function in X.
-turbulenceOffsetY(-toy)	float
The translation of the turbulence function in Y.
-turbulenceOffsetZ(-toz)	float
The translation of the turbulence function in Z.
-turbulenceSpeed(-trs)	float
The rate of change of the turbulence over time. The turbulence loops seamlessly every 1.0/turbulenceSpeed seconds. To animate this rate attach a new time node to the time input on the volumeAxisNode then animate the time value on the time node.
-volumeExclusion(-vex)	boolean
Volume exclusion of the field. If true, points outside the volume (defined by the volume shape attribute) are affected, If false, points inside the volume are affected. Has no effect if volumeShape is set to "none."
-volumeOffset(-vof)	linear linear linear
Volume offset of the field. Volume offset translates the field's volume by the specified amount from the actual field location. This is in the field's local space.
-volumeShape(-vsh)	string
Volume shape of the field. Sets/edits/queries the field's volume shape attribute. If set to any value other than "none", determines a 3-D volume within which the field has effect. Values are: "none," "cube," "sphere," "cylinder," "cone," "torus."
-volumeSweep(-vsw)	angle
Volume sweep of the field. Applies only to sphere, cone, cylinder, and torus. Similar effect to the sweep attribute in modelling.

Flag can appear in Create mode of command	Flag can appear in Edit mode of command
Flag can appear in Query mode of command	Flag can be used more than once in a command.

MEL examples

volumeAxis -pos 0 0 0 -afc 1.0 -afx 2.0 -arx 3.0 -alx 4.0 -drs 6.0;

// Creates a volume axis field with the following attribute values:
// awayFromCenter = 1.0, awayFromAxis = 2.0, aroundAxis = 3.0, alongAxis = 4.0,
// directionalSpeed = 6.0.