#include
<MFnClip.h>
List of all
members.
Detailed Description
clip function set
Maya uses animation clips as the building block of its nonlinear
animation system, "Trax". An animation clip allows the user to
bundle a set of animation curves independent of time so that they
can be reused multiple times, with different timing then the
original clip.
Character sets (MFnCharacter) are integral
to Maya's clip architecture, since a clip contains whatever
attributes of the character were animated when the clip was
created. For more information on character sets, refer to the
MFnCharacter documentation.
Clips in maya can be of two types: source clips and scheduled
clips. In the Maya UI, source clips are visible in the Visor while
scheduled clips are visible in Trax. A source clip contains the
animation curves for the clip. A scheduled clip contains data about
the placement of an instance of a source clip in the Maya timeline.
In this context, an "instance" means that the animation curves from
the source clip are shared by the scheduled clip. Scheduled clips
never contain their own animation curves, they always refer to a
source clip's curves.
For example, if you create a clip called "run" in maya that
lasts from frames 1-20, a source clip node will be created with a
start of 1, a duration of 19, and dependency graph connections to
all of the animation curves that make up the "run". If you then
place an instance of the run clip at frame 5 and another instance
of the run clip at frame 20, you have 2 scheduled clips: one with a
start frame of 5 and one with a start frame of 20. As mentioned in
the previous paragraph, only a single set of animation curves exist
for the run regardless of the number of times the run is
scheduled.
Trax also allows you to create "blends" between clips, which
enable you to control the transition between the clips. A blend is
represented in the dependency graph by an "animBlendInOut" node,
which uses an animation curve to determine the transition type.
In the dependency graph, when a character has animation clips,
the character node will always be connected to a "clipLibrary" node
and a "clipScheduler" node. The clipLibrary node is connected to
all of the source clips and their animation curves. The
clipScheduler node is connected to the scheduled clips and blends.
It is the clipScheduler that computes the final animation by
looking at the placement and overlap of the clips and feeding the
attribute data back into the character set.
To create a source clip, the typical steps are:
- If the attributes are not already in a character, create a
character containing the attributes.
- Create a source clip using MFnClip::createSourceClip
- Attach the clip to a character using MFnCharacter::attachSourceToCharacter
- Attach animation curves to the clip using MFnCharacter::addCurveToClip
To create a scheduled clip so that it appears in the Trax
Editor, the typical steps are:
- Create an instanced animClip node using MFnClip::createInstancedClip,
and associate it with the source clip that you want to
instance.
- Attach the clip instance to the character using MFnCharacter::attachInstanceToCharacter
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Public Member Functions
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virtual MFn::Type |
type ()
const |
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Function set type.
|
virtual |
~MFnClip
() |
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Destructor.
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MFnClip
() |
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Default constructor.
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MFnClip
(MObject &object,
MStatus
*ReturnStatus=NULL) |
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Constructor.
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MObject |
createSourceClip
(const MTime
&sourceStart, const MTime &sourceDuration, MDGModifier &dgMod,
MStatus
*ReturnStatus=NULL) |
MObject |
createInstancedClip
(MObject
&sourceClip, const MTime &start, MDGModifier &dgMod, MStatus *ReturnStatus=NULL,
bool absolute=1, double postCycle=0.0, double weight=1.0, double
scale=1.0, double preCycle=0.0) |
bool |
isInstancedClip
(MStatus
*ReturnStatus=NULL) |
bool |
isPose
(MStatus
*ReturnStatus=NULL) |
MObject |
sourceClip
(MStatus
*ReturnStatus=NULL) |
double |
getPreCycle
(MStatus
*ReturnStatus=NULL) |
double |
getPostCycle
(MStatus
*ReturnStatus=NULL) |
double |
getCycle
(MStatus
*ReturnStatus=NULL) |
|
This method is obsolete.
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double |
getWeight
(MStatus
*ReturnStatus=NULL) |
double |
getScale
(MStatus
*ReturnStatus=NULL) |
bool |
getAbsolute
(MStatus
*ReturnStatus=NULL) |
|
This method is obsolete.
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bool |
getEnabled
(MStatus
*ReturnStatus=NULL) |
MTime |
getStartFrame
(MStatus
*ReturnStatus=NULL) |
MTime |
getSourceStart
(MStatus
*ReturnStatus=NULL) |
MTime |
getSourceDuration
(MStatus
*ReturnStatus=NULL) |
MStatus |
getMemberAnimCurves
(MObjectArray
&curves, MPlugArray &associatedAttrs) |
MStatus |
getAbsoluteChannelSettings
(MIntArray
&absoluteChannels) |
int |
getTrack
(MStatus
*ReturnStatus=NULL) |
MStatus |
setPoseClip
(bool state, MDGModifier *mod=NULL) |
MStatus |
setPreCycle
(double cycle, MDGModifier *mod=NULL) |
MStatus |
setPostCycle
(double cycle, MDGModifier *mod=NULL) |
MStatus |
setCycle
(double cycle, MDGModifier *mod=NULL) |
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This method is obsolete.
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MStatus |
setWeight
(double wt, MDGModifier *mod=NULL) |
MStatus |
setScale
(double scale, MDGModifier *mod=NULL) |
MStatus |
setAbsolute
(bool abs, MDGModifier *mod=NULL) |
|
This method is obsolete.
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MStatus |
setEnabled
(bool val, MDGModifier *mod=NULL) |
MStatus |
setStartFrame
(const MTime &start,
MDGModifier
*mod=NULL) |
MStatus |
setSourceData
(const MTime &start,
const MTime
&duration, MDGModifier *mod=NULL) |
MStatus |
setTrack
(int index, MDGModifier *mod=NULL) |
MStatus |
setAbsoluteChannelSettings
(const MIntArray
&absoluteChannels, MDGModifier *mod=NULL) |
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MFnClip
(const MObject
&object, MStatus
*ReturnStatus=NULL) |
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Constructor.
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Protected Member Functions
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virtual const char * |
className
() const |
|
Class name.
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Constructor & Destructor Documentation
Constructor.
Class constructor that initializes the function set to the given
MObject.
- Parameters:
-
[in] |
object |
The MObject to
attach the function set to |
[out] |
ReturnStatus |
the return status |
- Status Codes:
-
MFnClip::MFnClip |
( |
const MObject & |
object, |
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MStatus * |
ReturnStatus =
NULL |
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|
) |
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|
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Constructor.
Class constructor that initializes the function set to the given
MObject.
- Parameters:
-
[in] |
object |
The MObject to
attach the function set to |
[out] |
ReturnStatus |
the return status |
- Status Codes:
-
Member Function Documentation
const char * MFnClip::className |
( |
|
) |
const [protected, virtual] |
Creates a source clip node and associates it with this function
set. Each animation clip has a single source clip, which defines
the startFrame and duration of the clip's animation curves. The
startFrame and duration act as a window onto the animation curves,
defining the range of animation that is considered part of the
clip. After a source clip node is created, it can be passed to a
MFnCharacter along with the clip
animCurves in order to associate the clip with the character.
- Parameters:
-
[in] |
sourceStart |
time on clip animCurves that represents clip start |
[in] |
sourceDuration |
time extent of the clip |
[in] |
dgMod |
command modifier used for undo and redo |
[out] |
ReturnStatus |
return status |
- Returns:
- The newly created clip.
- Status Codes:
-
MObject MFnClip::createInstancedClip |
( |
MObject & |
sourceClip, |
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const MTime & |
start, |
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MDGModifier & |
dgMod, |
|
|
MStatus * |
ReturnStatus =
NULL , |
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bool |
absolute = 1 , |
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double |
postCycle = 0.0 , |
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double |
weight = 1.0 , |
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double |
scale = 1.0 , |
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double |
preCycle = 0.0 |
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|
) |
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Creates an instance of a clip that will be viewable in the Trax
editor.
- Parameters:
-
[in] |
sourceClip |
the source clip node |
[in] |
start |
start frame where the instance will be scheduled |
[in] |
dgMod |
command modifier used for undo and redo |
[in] |
ReturnStatus |
return status |
[in] |
absolute |
whether the clip is absolute (1) or relative (0) |
[in] |
preCycle |
pre cycle for the clip |
[in] |
postCycle |
post cycle for the clip |
[in] |
weight |
weight for the clip |
[in] |
scale |
scale for the clip |
- Returns:
- The newly created clip.
- Status Codes:
-
bool MFnClip::isInstancedClip |
( |
MStatus * |
ReturnStatus =
NULL |
) |
|
Return true or false as to whether the clip node represents the
source clip or an instanced clip. All clips maintained by the
clipScheduler node and visible in the TraX editor are instanced
clips. All clips maintained by the clipLibrary node and visible in
the Visor are non-instanced clips, also called "Source Clips". Each
instanced clip has a corresponding source clip.
- Parameters:
-
[out] |
ReturnStatus |
return status |
- Returns:
- True or false as to whether the clip is an instanced clip.
- Status Codes:
-
bool MFnClip::isPose |
( |
MStatus * |
ReturnStatus =
NULL |
) |
|
Return true or false as to whether the clip node represents a
pose.
- Parameters:
-
[out] |
ReturnStatus |
return status |
- Returns:
- True or false as to whether the clip is a pose.
- Status Codes:
-
Return the source clip associated with the MFnClip's clip
- Parameters:
-
[out] |
ReturnStatus |
return status |
- Returns:
- MObject containing
the associated source clip.
- Status Codes:
-
- MS::kSuccess
operation successful
- MS::kObjectDoesNotExist this clip does not have an
associated source clip
- MS::kFailure this function
set does not have a valid clip object
double MFnClip::getPreCycle |
( |
MStatus * |
ReturnStatus =
NULL |
) |
|
Return the value of this clip's pre cycle attribute
- Parameters:
-
[out] |
ReturnStatus |
return status |
- Returns:
- The value of this clip's pre cycle attribute.
- Status Codes:
-
double MFnClip::getPostCycle |
( |
MStatus * |
ReturnStatus =
NULL |
) |
|
Return the value of this clip's post cycle attribute
- Parameters:
-
[out] |
ReturnStatus |
return status |
- Returns:
- The value of this clip's post cycle attribute.
- Status Codes:
-
double MFnClip::getCycle |
( |
MStatus * |
ReturnStatus =
NULL |
) |
|
This method is obsolete.
- Deprecated:
- Use the method MFnClip::getPostCycle
instead.
- Parameters:
-
[out] |
ReturnStatus |
return status |
- Returns:
- The value of this clip's cycle attribute.
- Status Codes:
-
double MFnClip::getWeight |
( |
MStatus * |
ReturnStatus =
NULL |
) |
|
Return the value of this clip's weight attribute
- Parameters:
-
[out] |
ReturnStatus |
return status |
- Returns:
- The value of this clip's weight attribute.
- Status Codes:
-
double MFnClip::getScale |
( |
MStatus * |
ReturnStatus =
NULL |
) |
|
Return the value of this clip's scale attribute
- Parameters:
-
[out] |
ReturnStatus |
return status |
- Returns:
- The value of this clip's scale attribute.
- Status Codes:
-
bool MFnClip::getAbsolute |
( |
MStatus * |
ReturnStatus =
NULL |
) |
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bool MFnClip::getEnabled |
( |
MStatus * |
ReturnStatus =
NULL |
) |
|
Return the value of this clip's enable attribute
- Parameters:
-
[out] |
ReturnStatus |
return status |
- Returns:
- The value of this clip's enable attribute.
- Status Codes:
-
MTime MFnClip::getStartFrame |
( |
MStatus * |
ReturnStatus =
NULL |
) |
|
Return the value of this clip's start frame
- Parameters:
-
[out] |
ReturnStatus |
return status |
- Returns:
- The value of this clip's start frame.
- Status Codes:
-
MTime MFnClip::getSourceStart |
( |
MStatus * |
ReturnStatus =
NULL |
) |
|
Return the value of the start frame of this clip's source clip.
The sourceStart and sourceDuration define the region of the
animCurve that is treated as the clip.
- Parameters:
-
[out] |
ReturnStatus |
return status |
- Returns:
- The value of this clip's source start frame.
- Status Codes:
-
- MS::kSuccess
operation successful
- MS::kFailure this function
set does not have a valid clip object
- MS::kObjectDoesNotExist this clip does not have an
associated source clip
MTime MFnClip::getSourceDuration |
( |
MStatus * |
ReturnStatus =
NULL |
) |
|
Return the value of the start frame of this clip's source
duration. The sourceStart and sourceDuration define the region of
the animCurve that is treated as the clip.
- Parameters:
-
[out] |
ReturnStatus |
return status |
- Returns:
- The value of this clip's source duration.
- Status Codes:
-
- MS::kSuccess
operation successful
- MS::kFailure this function
set does not have a valid clip object
- MS::kObjectDoesNotExist this clip does not have an
associated source clip
Return two arrays: the first contains the animCurves associated
with this clip. The second contains the character member that is
driven by this animCurve.
- Parameters:
-
[out] |
curves |
array to store the result curves |
[out] |
associatedAttrs |
array to store the character members |
- Returns:
- Return status
- Status Codes:
-
- MS::kSuccess
operation successful
- MS::kFailure this function
set does not have a valid clip object
- MS::kObjectDoesNotExist this clip does not have an
associated source clip
Return an array indicating which channels of the clip are
absolute and which are relative. The length of the array is equal
to the members in the character. A value of one in the array
indicates absolute and a value of 0 indicates relative.
- Parameters:
-
[out] |
absoluteChannels |
array to store the result |
- Returns:
- Return status
- Status Codes:
-
int MFnClip::getTrack |
( |
MStatus * |
ReturnStatus =
NULL |
) |
|
Return the track number for the clip. Track indices are
one-based. If a track index of zero is returned, it indicates that
a track has not yet been assigned to the clip.
- Parameters:
-
[out] |
ReturnStatus |
return status |
- Returns:
- The index of this clip's track
- Status Codes:
-
- MS::kSuccess
operation successful
- MS::kFailure this clip is a
source clip and does not have a track
- MS::kObjectDoesNotExist this function set does not have
a valid clip object
Specify whether or not this clip node should be tagged as a pose
rather than a clip. By default, clip nodes are not poses.
- Parameters:
-
[in] |
state |
true, to tag the clip as a pose |
[in] |
mod |
modifier to use when calling this method from commands that
support undo |
- Returns:
- Return status.
- Status Codes:
-
Specify the pre cycle value for the clip.
- Parameters:
-
[in] |
cycle |
cycle value |
[in] |
mod |
modifier to use when calling this method from commands that
support undo |
- Returns:
- Return status.
- Status Codes:
-
Specify the post cycle value for the clip.
- Parameters:
-
[in] |
cycle |
cycle value |
[in] |
mod |
modifier to use when calling this method from commands that
support undo |
- Returns:
- Return status.
- Status Codes:
-
This method is obsolete.
- Deprecated:
- Use the method MFnClip::setPostCycle
instead.
- Parameters:
-
[in] |
cycle |
cycle value |
[in] |
mod |
modifier to use when calling this method from commands that
support undo |
- Returns:
- Return status.
- Status Codes:
-
Specify a weight value for the clip.
- Parameters:
-
[in] |
wt |
weight value |
[in] |
mod |
modifier to use when calling this method from commands that
support undo |
- Returns:
- Return status.
- Status Codes:
-
Specify a scale value for the clip.
- Parameters:
-
[in] |
scale |
scale value |
[in] |
mod |
modifier to use when calling this method from commands that
support undo |
- Returns:
- Return status.
- Status Codes:
-
This method is obsolete.
- Deprecated:
- Use the method MFnClip::setAbsoluteChannelSettings
instead.
- Parameters:
-
[in] |
abs |
true if absolute, false if relative |
[in] |
mod |
modifier to use when calling this method from commands that
support undo |
- Returns:
- Return status.
- Status Codes:
-
Specify whether or not the clip is enabled. Note: should not be
called for source clips since the enabled attribute is ignored on
source clips.
- Parameters:
-
[in] |
val |
enable value |
[in] |
mod |
modifier to use when calling this method from commands that
support undo |
- Returns:
- Return status.
- Status Codes:
-
Specify the start frame for the instanced clip. Note: should not
be called for source clips since the start frame attribute is
ignored on source clips.
- Parameters:
-
[in] |
start |
start frame value |
[in] |
mod |
modifier to use when calling this method from commands that
support undo |
- Returns:
- Return status.
- Status Codes:
-
Specify the start frame and duration for the source clip
associated with this clip.
- Parameters:
-
[in] |
start |
source start frame value |
[in] |
duration |
source duration value |
[in] |
mod |
modifier to use when calling this method from commands that
support undo |
- Returns:
- Return status.
- Status Codes:
-
- MS::kSuccess
operation successful
- MS::kFailure this function
set does not have a valid clip object
- MS::kObjectDoesNotExist this clip does not have an
associated source clip
Specify the one-based track number for the clip.
- Parameters:
-
[in] |
trackIndex |
the track number for the clip |
[in] |
mod |
modifier to use when calling this method from commands that
support undo |
- Returns:
- Return status
- Status Codes:
-
- MS::kSuccess
operation successful
- MS::kFailure this function
set does not have a valid clip object
- MS::kObjectDoesNotExist clip track value cannot be
set
Set which channels of the clip are absolute and which are
relative. The length of the specified array should be equal to the
number of members in the character. A value of one in the array
indicates absolute and a value of 0 indicates relative.
- Parameters:
-
[in] |
absoluteChannels |
array containing the absolute channels to be set |
[in] |
mod |
modifier to use when calling this method from commands that
support undo |
- Returns:
- Return status
- Status Codes:
-
- MS::kSuccess
operation successful
- MS::kObjectDoesNotExist this function set does not have
a valid clip object