Object Hierarchy | Related C++ Class: ShapeClip | Supported Parameter List: mixershapeclip
Inheritance
SIObject
ProjectItem
Clip
ShapeClip
Introduced
1.5
Description
A ShapeClip object is an instance of a shape key (source) at a particular position along a shape track in the animation mixer. You can create shape clips using the Geometry.SaveShapeKey method. To enumerate existing shape clips you must pass the full string path of the shape track's ClipList to the EnumElements command which returns a collection of ShapeClip objects.
You can create multiple clips of the same source (using the AddClip command), thereby returning to the same shape several times in the same animation, or rearrange the order of the shape clips on the tracks to change the shape animation completely.
The ShapeClip object allows you to access the shape animation stored in clusters by using the Clip.MappedItems method. Each MappedItem object returns the ShapeKey object (a specialized kind of ClusterProperty) from the MappedItem.Source2 method. ShapeKeys contain shape animation data and you can use the ShapeKey's base property SIObject.Parent to get the shape-animated Cluster object.
When you save a shape key in local reference mode (siShapeLocalReferenceMode) only the deltas to the point's local referential are stored. If you need to get the absolute position for each point in the shape you will need the local referential for the point and the original position of the point before the shape key was applied.
In order to get the local referential (Geometry0D.LocalReferenceFrame) and the original position for each point you will need to mute the shape combiner and all other operators above it using the DeactivateAbove command.
Methods
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Properties
Examples
1. VBScript Example
'
' The following example illustrates how to access the position
' information stored in a shape key. Adding a shape key using
' local reference mode will store the positions as deltas to
' the local referential of each point. To calculate the
' absolute position for each point you need the local
' referential for the point and the original position before
' the shape was applied.
'
' Create the scene with an object with a shape clip
NewScene , false
set root = ActiveSceneRoot
set c1 = root.AddGeometry( "Cube", "MeshSurface" )
set c2 = Duplicate( c1, , 2, 1, 1, 0, 0, 1, 0, 1 )(0)
Translate c2, 10, 0, -2, siRelative, siView, siObj, siXYZ
Translate c2 & ".pnt[2,3,6,LAST]", -6, -4, 4, siRelative, siView, siObj, siXYZ
' Add a shapeclip where the position data is stored as deltas to
' the point's local referential. You can also store the shape in
' absolute mode in which case the cluster property contains
' for the shape the actual point data or you can store it in
' object mode in which case deltas are stored in the object
' referential (i.e. the pose of the object).
set key = SelectShapeKey( c1, c2, siShapeLocalReferenceMode )
dim mix
if root.HasMixer() then
set mix = root.Mixer
else
set mix = root.AddMixer()
end if
set shapetrack = AddTrack( root, mix, 1 )
AddClip root, key, , shapetrack, 1, , , , False
'
' Get the shapeclip
'
dim clip
for each c in mix.Clips
if c.Type = siClipShapeType then
set clip = c
end if
next
' We need to mute the shape combiner and all the operators above it
' inorder to get the local reference frame and position of each
' point before the shape animation was applied to the geometry.
' (This gives the position values before the shape that was stored
' and does not include the result of deformations applied afterwards.)
set geom = Nothing
set oMatrix33 = XSIMath.CreateMatrix3
set oDelta = XSIMath.CreateVector3
set oXAxis = XSIMath.CreateVector3
set oYAxis = XSIMath.CreateVector3
set oZAxis = XSIMath.CreateVector3
for idx=0 to clip.MappedItems.Count-1
set mi = clip.MappedItems(idx)
LogMessage TypeName(mi)
LogMessage TypeName(mi.Source2)
' Get the cluster property/shape key stored in the shapeclip
set clsprop = mi.Source2
' Since the geometry for each mappeditem will be
' the same we'll only need to get it once.
if TypeName(geom) = "Nothing" then
' Get the cluster, primitive and geometry from the
' cluster property
set cls = clsprop.Parent
set geom = cls.Parent
set prim = geom.Parent
' Deactivate all operators above and including the shape combiner
DeactivateAbove prim.FullName & ".clustershapecombiner", True
' Get the position array from the geometry
aPosition = geom.Points.PositionArray
' Get the old Geometry0D object to access
' the local reference frame for each point
set geomv1 = geom.Parent.Obj
set o0DGeometry = geomv1.Geometry0D
end if
' Assume that the number of cluster property elements
' matches the geometry and that they are same order i.e.
' point0 == clusterelement0
' Get the delta position array from the clusterproperty
aDelta = clsprop.Elements.Array
' Figure out the absolute position value using the deltas,
' the original point position and the local referential
' of each point
for i=LBound( aDelta, 2 ) to UBound( aDelta, 2 )
' Set a vector3 with the delta for the position
oDelta.Set aDelta( 0, i ), aDelta( 1, i ), aDelta( 2, i )
' Get the local reference frame for the point
o0DGeometry.LocalReferenceFrame i, _
oXAxis, oXAxisValid, _
oYAxis, oYAxisValid, _
oZAxis, oZAxisValid
' Get the transformation matrix to go from point
' local reference frame to object referential
oMatrix33.Set _
oXAxis.X , oXAxis.Y, oXAxis.Z, _
oYAxis.X , oYAxis.Y, oYAxis.Z, _
oZAxis.X , oZAxis.Y, oZAxis.Z
oDelta.MulByMatrix3 oDelta, oMatrix33
' Set a vector3 with the point position
set oPosition = XSIMath.CreateVector3
oPosition.Set _
aPosition( 0, i ), _
aPosition( 1, i ), _
aPosition( 2, i )
' Compute the absolute position by adding the delta
oPosition.AddInPlace oDelta
' Log the absolute position values for the point
LogMessage oPosition.X & "," & oPosition.Y & "," & oPosition.Z
next
next
' Reactivate shapecombiner and all operators above it
if TypeName(prim) <> "Nothing" then
DeactivateAbove prim.FullName & ".clustershapecombiner", False
end if
' Enumerate the shapeclips under the mixer shape track.
for each t in ActiveSceneRoot.Mixer.Tracks
if t.Type = siTrackShapeType then
set shapetrack = t
exit for
end if
next
for each shapeclip in shapetrack.Clips
LogMessage shapeclip
next
'Expected results:
'INFO : MappedItem
'INFO : ShapeKey
'INFO : -4,-4,-4
'INFO : 4,-4,-4
'INFO : -10,1.33226762955019E-15,-1.33226762955019E-15
'INFO : -2,1.33226762955019E-15,-1.33226762955019E-15
'INFO : -4,-4,4
'INFO : 4,-4,4
'INFO : -10,8.88178419700125E-16,8
'INFO : -2,8.88178419700125E-16,8
'INFO : Mixer.Mixer_Shape_Track.cube1_ShapeKey_Clip
2. JScript Example
/*
This Shape Animation example demonstrates how to use GetDrivingActions()
to get at the ShapeClips which animate an object. It also demonstrates
how to access the fcurves on each clip
*/
// Create a little sample scene with a simple animated sphere
NewScene( null, false );
// Make sure we are in Mixed Weight Mode
SetUserPref( "ShapeInstancingMode", 1 );
var oSphere = ActiveSceneRoot.AddGeometry( "Sphere", "MeshSurface" );
SaveShapeKey( "sphere", null, null, 1, null, null, null, null,
siShapeLocalReferenceMode );
// Move a vertice and record that as the shape at frame 20
SelectGeometryComponents( "sphere.pnt[33]" );
Translate( null, 3, 0, 0, siRelative, siView, siObj, siXYZ );
SaveShapeKey( oSphere + ".pnt[33]", null, null, 20, null, null, null, null,
siShapeLocalReferenceMode );
// Move another point as shape for frame 30
SelectGeometryComponents( "sphere.pnt[1]" );
Translate( null, 0, 3, 0, siRelative, siView, siObj, siXYZ );
SaveShapeKey( oSphere + ".pnt[1]", null, null, 30, null, null, null, null,
siShapeLocalReferenceMode );
// Access the ShapeClips which have been created on the object
var oClips = GetDrivingActions( oSphere, false, null, false, false );
for ( var i=0; i<oClips.Count; i++ ) {
// Get the clip
var oClip = oClips(i);
// Access the animated parameter which controls the weight of the clip
// in the mixer
var oParam = Dictionary.GetObject( oClip + ".actionclip.weight" );
var oFCurve = oParam.Source;
// At frame 40 we will do an equal blend of all the shapes
oFCurve.AddKey( 40, 1 );
// Print out the keys
var oFCurveKeys = oFCurve.Keys;
LogMessage( "FCurve on " + oClip );
for ( var j=0; j<oFCurveKeys.Count; j++ ) {
var oFCurveKey = oFCurveKeys.Item( i );
LogMessage( " Time:" + oFCurveKey.Time + "-" + oFCurveKey.Value );
}
}
// Expected result:
//INFO : FCurve on Mixer.Mixer_Shape_Track.Shape_ClusterClip.Mixer_Shape_Track3.ShapeKey2_Clip
//INFO : Time:20-0
//INFO : Time:20-0
//INFO : Time:20-0
//INFO : FCurve on Mixer.Mixer_Shape_Track.Shape_ClusterClip.Mixer_Shape_Track2.ShapeKey1_Clip
//INFO : Time:20-1
//INFO : Time:20-1
//INFO : Time:20-1
//INFO : Time:20-1
//INFO : FCurve on Mixer.Mixer_Shape_Track.Shape_ClusterClip.Mixer_Shape_Track1.ShapeKey_Clip
//INFO : Time:40-1
//INFO : Time:40-1
//INFO : Time:40-1
See Also
SOFTIMAGE|XSI v6.01