ClipEffect Class Reference

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Detailed Description

A ClipEffect represents the set of effects associated with a Clip. Each ClipEffect object contains one item corresponding to a MappedItem.

These ClipEffectItems contain expressions that control the clip without affecting the Source on which the clip was instantiated. For example, you can create a walk cycle with a progressive offset by using an expression similar to this:

 (cid * 10) + this 

ClipEffects are available from the Clip object using Clip::GetEffect.

See also:

Clip, MappedItem::GetClipEffectItem, ClipEffectItem, Clip::GetEffect, GetMappingRule, SetMappingRule

Since:

4.0

Example:

Demonstrates how to use MappedItems to look for a specific animation channel. Once this channel is found a clip effect is added onto it.

        using namespace XSI;
        Application app;
        Model root = app.GetActiveSceneRoot();

        X3DObject myCube;
        root.AddGeometry( L"Cube", L"MeshSurface", L"", myCube );

        //Creating the first animation source
        CValueArray args(9);
        CValue      outArg;
        args[0] = root;
        args[1] = L"cube.kine.local.posx,cube.kine.local.posy,cube.kine.local.posz";
        args[2] = 1l;
        args[3] = L"StoredStaticPose";
        args[4] = true;
        args[5] = 1l;
        args[6] = 5l;
        args[7] = false;
        args[8] = false;
        app.ExecuteCommand( L"StoreAction", args, outArg );

        Source mySource(outArg);

        //Creating the first clip
        CValueArray addClipArgs(6);
        addClipArgs[0] = root;
        addClipArgs[1] = mySource.GetFullName();
        addClipArgs[5] = L"MyClip1";
        app.ExecuteCommand( L"AddClip", addClipArgs, outArg );

        Clip myClip(outArg);
        CRefArray mappedItems = myClip.GetMappedItems();
        // Find the mapped item on which we wan't to add an effect.
        // We are looking for the local.posy parameter
        LONG i;
        MappedItem currItem;
        for(i = 0; i < mappedItems.GetCount(); ++i)
        {
            currItem = mappedItems[i];
            Parameter param = currItem.GetDestination();
            if(param.GetFullName().IsEqualNoCase(L"cube.kine.local.posy"))
            {
                CValueArray mappingRuleArgs(4);
                mappingRuleArgs[0] = myClip.GetFullName() + L".ActionClip";
                mappingRuleArgs[1] = param;
                mappingRuleArgs[2] = L"frame";
                mappingRuleArgs[3] = (LONG)(i + 1);

                app.ExecuteCommand(L"SetMappingRule", mappingRuleArgs, outArg);
                break;
            }
        }

        ClipEffectItem effectItem(currItem.GetClipEffectItem());
        app.LogMessage(L"The expression associated with the posy item is >> " +
                        effectItem.GetExpression());

Example:

Illustrates how to get at the ClipEffect objects by creating some sources and clips with clip effects and then finding them again through the mapped items on the clips in the mixer.

        using namespace XSI;

        // Forward declarations
        CString GetRelativeNameForTarget( Parameter& in_param );
        void CreateStaticSource();


        Application app;

        // NewScene command
        CValueArray cargs; CValue oarg;
        cargs.Add( L"" ); cargs.Add( false );
        app.ExecuteCommand( L"NewScene", cargs, oarg );
        cargs.Clear(); oarg.Clear();

        // Set up the scene
        Model root = app.GetActiveSceneRoot();
        CreateStaticSource();

        // Get all the clips in the mixer and then the sources
        Mixer mix = root.GetMixer();
        CRefArray cliplist = mix.GetClips();
        for ( LONG i=0; i<cliplist.GetCount(); ++i ) {
            Clip clp( cliplist[i] );

            // Look at their mapped items, but avoid the audio clips
            if ( clp.GetType() != siClipAudioType ) {
                CRefArray mappings = clp.GetMappedItems();
                if ( mappings.IsValid() ) {
                    app.LogMessage( L"Found " + CString(mappings.GetCount()) + L" mapped items(s)" );
                    for ( LONG j=0; j<mappings.GetCount(); j++ ) {
                        MappedItem mapitem( mappings[j] );

                        // Each item on the clip effect may have an expression that controls
                        // its behavior independently of the original source
                        ClipEffectItem clpfxitem = mapitem.GetClipEffectItem();
                        if ( clpfxitem.GetExpression() != L"" ) {
                            app.LogMessage( L"...this clip has a clip effect item matching this expression:" );
                            app.LogMessage( L"   " + clpfxitem.GetExpression() );
                        }

                        // The mapped item also provides access to the driven parameter
                        Parameter dest( mapitem.GetDestination() );
                        app.LogMessage( L"...destination parameter: " + dest.GetFullName() );
                    }
                }

            }
        }


        // Expected Results:
        //INFO : Found 3 mapped items(s)
        //INFO : ...destination parameter: MyNull.kine.local.posx
        //INFO : ...destination parameter: MyNull.kine.local.posy
        //INFO : ...destination parameter: MyNull.kine.local.posy


        // This is a handy function to have around if you're going to create an action
        // source or clip on a parameter that is in a nested model (ie., not directly
        // under the Scene_Root) because AddClip will force a mapping template if your
        // parameter is not relative.
        CString GetRelativeNameForTarget( Parameter& in_param )
        {
            Model mdl = in_param.GetModel();
            CString mdlname = mdl.GetFullName();
            if ( mdlname.IsEqualNoCase(L"Scene_Root") ) {
                return in_param.GetFullName();
            } else {
                CString tmp = in_param.GetFullName();
                CString lookfor = mdlname + L".";
                CString foundsofar = L"";
                CString relpath = L"";
                for ( ULONG i=0; i<tmp.Length(); ++i ) {
                    if ( foundsofar.IsEqualNoCase(lookfor) ) {
                        relpath += tmp[i];
                    } else {
                        foundsofar += tmp[i];
                    }
                }
                return relpath;
            }
        }

        // Convenience function
        void CreateStaticSource()
        {
            Application app;

            // Get the SceneRoot and create a cone in it
            Model root = app.GetActiveSceneRoot();
            Null n; root.AddNull( L"MyNull", n );

            // Get the parameters to use as targets
            Parameter posx = n.GetParameter( L"posx" ); CString rposx = GetRelativeNameForTarget( posx );
            Parameter posy = n.GetParameter( L"posy" ); CString rposy = GetRelativeNameForTarget( posy );
            Parameter posz = n.GetParameter( L"posz" ); CString rposz = GetRelativeNameForTarget( posz );

            // Create a stored static pose
            ActionSource src = root.AddActionSource( L"StoredStaticPose" );
            src.AddSourceItem( rposx, 5.5743, true );
            src.AddSourceItem( rposy, 0.1953, true );
            src.AddSourceItem( rposy, -0.0195, true );

            // Instantiate it in the mixer
            CValueArray clpArgs(9); CValue clpOut;
            clpArgs[0] = root.GetFullName();
            clpArgs[1] = src.GetFullName();
            clpArgs[4] = CValue(4.0);                          // starts at frame 4
            app.ExecuteCommand( L"AddClip", clpArgs, clpOut );
        }

#include <xsi_clipeffect.h>

Inheritance diagram for ClipEffect:

List of all members.

Public Member Functions
	ClipEffect ()
	~ClipEffect ()
	ClipEffect (const CRef &in_ref)
	ClipEffect (const ClipEffect &in_obj)
bool	IsA (siClassID in_ClassID) const
siClassID	GetClassID () const
ClipEffect &	operator= (const ClipEffect &in_obj)
ClipEffect &	operator= (const CRef &in_ref)
CRefArray	GetItems () const
CParameterRefArray	GetVariables () const
bool	GetIsActive () const
bool	GetPoseIsActive () const
siTimeReferenceType	GetTimeReference () const
StaticKinematicState	GetPoseEffect () const

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Constructor & Destructor Documentation

ClipEffect

(

)

Default constructor.

~ClipEffect

(

)

Default destructor.

ClipEffect

(

const CRef &

in_ref

)

Constructor.

Parameters:

in_ref

constant reference object.

ClipEffect

(

const ClipEffect &

in_obj

)

Copy constructor.

Parameters:

in_obj

constant class object.

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Member Function Documentation

bool IsA

(

siClassID

in_ClassID

)

const [virtual]

Returns true if a given class type is compatible with this API class.

Parameters:

in_ClassID

class type.

Returns:

true if the class is compatible, false otherwise.

Reimplemented from SIObject.

siClassID GetClassID

(

)

const [virtual]

Returns the type of the API class.

Returns:

The class type.

Reimplemented from SIObject.

ClipEffect& operator=

(

const ClipEffect &

in_obj

)

Creates an object from another object. The newly created object is set to empty if the input object is not compatible.

Parameters:

in_obj

constant class object.

Returns:

The new ClipEffect object.

ClipEffect& operator=

(

const CRef &

in_ref

)

Creates an object from a reference object. The newly created object is set to empty if the input reference object is not compatible.

Parameters:

in_ref

constant class object.

Returns:

The new ClipEffect object.

Reimplemented from SIObject.

CRefArray GetItems

(

)

const

Returns all items contained in this ClipEffect. There is one ClipEffectItem for every MappedItem.

Returns:

Array of references to ClipEffectItem objects.

CParameterRefArray GetVariables

(

)

const

Returns the parameters which are shared by all ClipEffectItem objects.

Returns:

Array of references to Parameter objects.

bool GetIsActive

(

)

const

Returns true if the ClipEffect will be computed in the clip evaluation.

Returns:

True if the effect is active, false otherwise.

bool GetPoseIsActive

(

)

const

Returns true if the ClipEffect transformation effect is active.

Returns:

True if the effect is active, false otherwise.

siTimeReferenceType GetTimeReference

(

)

const

Returns either siOriginalClip (the effect will repeat itself over time) or siExtrapolatedClip (the effect spans over extrapolation).

Returns:

The time reference type (see the siTimeReferenceType enum).

StaticKinematicState GetPoseEffect

(

)

const

Returns the StaticKinematicState property containing the transformation which is used for this clip effect.

Returns:

StaticKinematicState representing the transformation used.

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The documentation for this class was generated from the following file:

• xsi_clipeffect.h