## FCurve.KeyExists

### Introduced

v3.0

### Description

Returns true if a key exists at the specified frame.

### C# Syntax

    Boolean FCurve.KeyExists( Object in_Frame, Double in_Tolerance );

### Scripting Syntax

    oBoolean = FCurve.KeyExists( Frame, [Tolerance] );

### Return Value

Boolean

### Parameters

Parameter | Type | Description
--- | --- | ---
Frame | Variant | The key time in frames at which to look for a key.
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

### Examples

#### JScript Example

    /*
            This JScript example illustrates how to use the FCurve.KeyExists method
            to find keys on an fcurve.
    */
    // Create a null
    Application.NewScene( null, false );
    var nullobj = ActiveSceneRoot.AddNull();
    // Create an fcurve on the posx parameter from the null
    var fc = nullobj.posx.AddFCurve();
    // Define some random keys
    var nbkeys = 10;
    var arraysize = nbkeys * 2;
    var keys = new Array( 2 * nbkeys );
    var i = 0, empty;
    offset = -50;
    for ( i=0; i<arraysize; i+=2 )
    {
            keys[i] = offset + Math.random() * 100 ;
            keys[i+1] = Math.cos( Math.random() ) * 10;
    }
    keys.sort();
    // Set the keys on the fcurve
    fc.SetKeys( keys );
    // Find the random keys
    for ( i=-50; i<50; i++ )
    {
            if ( fc.KeyExists(i) )
            {
                    LogMessage( "found key near frame " + i );
            }
            var ckeys = fc.GetNumKeys( i - 0.5, i + 0.5 )
            if ( ckeys > 1 )
            {
                    LogMessage( "found "+ ckeys + " keys around frame " + i );
            }
    }
    // Outputs:
    //INFO : found key near frame -21
    //INFO : found key near frame -20
    //INFO : found key near frame -7
    //INFO : found key near frame -6
    //INFO : found key near frame -5
    //INFO : found key near frame -4
    //INFO : found 2 keys around frame -4
    //INFO : found key near frame -3
    //INFO : found key near frame -2
    //INFO : found key near frame 5
    //INFO : found key near frame 6
    //INFO : found key near frame 7
    //INFO : found key near frame 8
    //INFO : found key near frame 9
    //INFO : found key near frame 10

### See Also

FCurve.GetKey