drag

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Synopsis

drag [-attenuation float] [-directionX float] [-directionY float] [-directionZ float] [-magnitude float] [-maxDistance linear] [-name string] [-perVertex boolean] [-position linear linear linear] [-torusSectionRadius linear] [-useDirection boolean] [-volumeExclusion boolean] [-volumeOffset linear linear linear] [-volumeShape string] [-volumeSweep angle] [objects]

drag 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. Drag exerts a friction, or braking force proportional to the speed of a moving object. If direction is not enabled, the drag acts opposite to the current velocity of the object. If direction is enabled, it acts opposite to the component of the velocity in the specified direction. The force is independent of the position of the affected object.

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.

Related

Flags

Long name (short name)	Argument types	Properties
-attenuation(-att)	float
Attentuation rate of field
-directionX(-dx)	float
X-component of direction.
-directionY(-dy)	float
Y-component of direction.
-directionZ(-dz)	float
Z-component of direction
-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.
-useDirection(-ud)	boolean
Enable/disable direction. Drag will use -dx/-dy/-dz arguments if and only if this flag is set true.
-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

// Creates a drag field resisting in direction (0,1,0.5).
 drag -dx 0 -dy 1.0 -dz 0.5 -useDirection true;

// Edits the acceleration value of the field myDrag
   drag -e -m 0.75 myDrag;

// Queries myDrag for its magnitude
   drag -q -m myDrag;