## ActionDelta.AddExpressionItem

### Description

Adds a new ActionDeltaItem of type siModificationDeltaExpression to an ActionDelta created with the Delta.AddAction method.
The ActionDelta should be of type siModificationDeltaExpression to use this method (see siModificationDeltaType for a list of ActionDelta types).

### C# Syntax

    ActionDeltaItem ActionDelta.AddExpressionItem( Object in_vTarget, Object in_vExpression );

### Scripting Syntax

    oReturn = ActionDelta.AddExpressionItem( Target, Expression );

### Return Value

ActionDeltaItem

### Parameters

Parameter | Type | Description
--- | --- | ---
Target | String | Target path for source item
Expression | String | The definition (formula) that defines the expression. For more information on how to define an expression, see "Expression Reference" in the Softimage User?s Guide.

### Examples

#### JScript Example

    /*
            This example demonstrates how to add an ActionDeltaItem of type
            siModificationDeltaExpression to a ActionDelta.
    */
    NewScene (null, false);
    // Create a reference model from a cube
    var oRoot = Application.ActiveProject.ActiveScene.Root;
    var oCube = oRoot.AddGeometry("Cube", "MeshSurface");
    var emdlFileRefModel = XSIUtils.BuildPath(Application.InstallationPath(siProjectPath), "Models", "MyModel.emdl");
    CreateModelAndConvertToRef(oCube, emdlFileRefModel);
    // Create a cone
    var oCone = oRoot.AddGeometry("Cone", "MeshSurface");
    // Translate the cube that also generate a delta
    Translate(oCone , 3.0, 3.0, 0, siRelative, siView, siObj, siXYZ, null, null, null, null, null, null, null, null, null, 0, null);
    // Add the Delta object
    var oDelta = AddDelta(oCube.Model);
    // Add an action of type siModificationDeltaExpression
    var oDeltaAction = oDelta.AddAction(siModificationDeltaExpression)
    // Add the expression item
    var oActionDeltaItem = oDeltaAction.AddExpressionItem(oCube + ".kine.global.posx",  "5*sin(" + oCone + ".kine.local.posx * 15)");
    // Apply modification
    oDelta.Apply();

### See Also

ActionDelta.AddFCurveItem ActionDelta.AddConstraintItem ActionDelta.AddStaticValueItem