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Flags. MEL
examples.
gravity [-attenuation float] [-directionX float] [-directionY float] [-directionZ float] [-magnitude float] [-maxDistance linear] [-name string] [-perVertex boolean] [-position linear linear linear]
[objects]
gravity is undoable, queryable, and editable.
A gravity field simulates the Earth's gravitational force. It pulls
objects in a fixed direction (generally downward) entirely
independent of their position or mass. 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. The
default for -dx -dy -dz is always the opposite of the current up
direction. For example, if the current up direction is (0,1,0) (a
standard Maya configuration), then the gravity default is -dx 0 -dy
-1 -dz 0. The default for -a is 9.8. 9.8 meters per second squared
happens to be standard Earth gravity, but in fact Maya interprets
this value as centimeters per second squared. If we were to use it
as meters per second squared then with default Maya units, your
particles would vanish almost in the wink of an eye. If you want a
different value, set it in the gravity option box.
In query mode, return type is based on queried flag.
addDynamic, connectDynamic, particle
attenuation, directionX, directionY, directionZ, magnitude, maxDistance, name,
perVertex, position
| Long name (short name) |
Argument types |
Properties |
-position(-pos) |
linear linear linear |
   |
|
Position in space where you want to place a 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. |
|
-magnitude(-m) |
float |
|
|
|
-attenuation(-att) |
float |
|
|
Attentuation rate of field |
|
-maxDistance(-mxd) |
linear |
|
|
Maximum distance at which field is exerted. -1 indicates that
the field has no maximum distance. |
|
-name(-n) |
string |
|
|
|
-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 force is exerted only from the geometric center of
the set of points. |
|
-directionX(-dx) |
float |
|
|
X-component of direction. |
|
-directionY(-dy) |
float |
|
|
Y-component of direction. |
|
-directionZ(-dz) |
float |
|
|
|
 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. |
gravity particle1;
// Creates a gravity field and adds it to the list of fields
// owned by particle1.
gravity -pos -2 0 4;
// Creates a gravity field at position (0,2,4) in world coordinates.
gravity -e -att 10.4 MyGravity;
// Changes the gravitational acceleration of the field called
// "MyGravity" to 10.4.
gravity -dx 0 -dy 1.0 -dz 0.5;
// Creates a gravity field pulling in direction (0,1,0.5) for every
// active selection. If there is no active selection, it creates this
// field at world position (0,0,0).