## FCurve.AddKey

### Introduced

v3.0

### Description

Adds a key at the given frame and returns the index of the new key. This method changes the overall shape of the fcurve. If you want to add a key along the existing profile (without affecting its shape, use the FCurve.InsertKeyAtFrame method instead.
Note: If the fcurve if locked then the method will raise an 'Access Denied' (E_ACCESSDENIED) error.
The tolerance argument can be used to merge all keys within a certain range. The range is defined as Frame - Tolerance and Frame + Tolerance. The merged key inherits the constraints of the nearest key within this range.

### C# Syntax

    Int32 FCurve.AddKey( Object in_Frame, Object in_Value, Double in_Tolerance, Boolean in_Overwrite );

### Scripting Syntax

    oLong = FCurve.AddKey( [Frame], [Value], [Tolerance], [Overwrite] );

### Return Value

Long

### Parameters

Parameter | Type | Description
--- | --- | ---
Frame | Variant | Time in frames at which to add the key. Default Value: Current Time
Value | Variant | Value of the key. For standard and raw fcurves use a double value (VT_R8). For integer fcurves use a LONG (VT_I4) For boolean fcurves use a variant bool value (VT_BOOL,VARIANT_TRUE,VARIANT_FALSE) Default Value: The value on the existing curve at the given frame.
Tolerance | Double | Key tolerance Default Value: -1
Possible Values: | Description:
>0 | Matches key between Frame - Tolerance and Frame + Tolerance
0 | Key must be exactly at frame
-1 | Nearest 0.5 frame
Overwrite | Boolean | Overwrite existing keys. Use this to overwrite a key with a lock. Default Value: False

### Examples

#### JScript Example

    /*
            This example illustrates how to add keys to an fcurve and how to use
            the editing recording feature so that only one undo event is put onto the
            undo/redo stack.
    */
    // Create a null
    Application.NewScene( "", false );
    var nullobj = ActiveSceneRoot.AddNull();
    // Create an fcurve on the posx parameter from the null
    var fc = nullobj.posx.AddFCurve();
    // Define the number of keys
    var nbkeys = 100 ;
    // Start editing the fcurve
    fc.BeginEdit();
    // Add keys to the fcurve
    for ( i=0; i<nbkeys; i++ )
    {
            val = (Math.sin( 1/(i+1) ) * 10);
            fc.AddKey( i, val );
    }
    // End editing the fcurve and put the undo event onto
    // the undo/redo stack
    fc.EndEdit();

### See Also

FCurve.InsertKeyAtFrame FCurveKey.Locked FCurve.Resample FCurve.RemoveKey