## Parameter.IsSupportedInstanceValue

### Introduced

v5.0

### Description

Returns true if the value is supported by the parameter. For example, many shaders have a parameter of input type of siTextureSpaceParameterType (see Shader.GetShaderInputType) but may only support vertex color Property objects. This method will support passing the name of the property or the actual property itself.

### C# Syntax

    Boolean Parameter.IsSupportedInstanceValue( Object in_obj, Object );

### Scripting Syntax

    oBoolean = Parameter.IsSupportedInstanceValue( Object, Value );

### Return Value

Boolean

### Parameters

Parameter | Type | Description
--- | --- | ---
Object | Object such as a X3DObject | Object using the shared property
Value | Variant | New value for instance.

### Examples

#### JScript Example

    /*
            This example demonstrates how to set a map lookup shader on a parameter
            and then test it for supported maps
    */
    NewScene( null, false );
    // Create a grid with a map lookup shader
    var root = Application.ActiveProject.ActiveScene.Root;
    var grid = root.AddGeometry( "Grid", "MeshSurface" );
    BlendInPresets( "Image", grid, 1, false );
    CreateProjection( grid, siTxtSpherical, siTxtDefaultSpherical, "TxtSupport", "TxtProjection" );
    var filename = Application.InstallationPath( siFactoryPath ) + "\\Data\\XSI_SAMPLES\\Pictures\\xsilogo.jpg";
    var imageclip = CreateImageClip( filename, "XSILogo" );
    var mat = grid.Material;
    var shaders = mat.FindShaders( siShaderFilter );
    var textureshader = shaders("Image");
    var txtparam = textureshader.Parameters("tspace_id");
    // Don't want to deal with cluster to find UVW prop
    txtparam.SetInstanceValue( grid, "TxtProjection" );
    var txtuvw = txtparam.GetInstanceValue( grid, true );           // true == bind to object
    var cav = grid.ActivePrimitive.Geometry.AddVertexColor();
    var weightmap = CreateWeightMap( "WeightMap", grid, "Weight_Map" )(0);
    var txtmap = Create2DMap( grid, "Texture_Map", siDefaultPropagation )(0);
    txtmap.Parameters("ImageClipName").Value = imageclip.Name;
    txtmap.Parameters("UVReference").SetInstanceValue( grid, txtuvw );
    var polycls = grid.ActivePrimitive.Geometry.AddCluster( siPolygonCluster,"RenderMapCluster" );
    var rendermap = polycls.AddProperty( "RenderMap" );
    // Replace image shader with map lookup
    var ambient_blend = shaders("ambient_blend");
    var maplookup = ambient_blend.Parameters("color1").ConnectFromProgID( "Softimage.map_lookup_color" );
    var mapparam = maplookup.Parameters("map");
    // Setup maps array
    var maps = Array( weightmap, cav, txtuvw, txtmap, rendermap );
    // Test map lookup shader for supported maps
    for ( var i = 0; i < maps.length; i++ ) {
            if ( mapparam.IsSupportedInstanceValue( grid, maps[i] ) ) {
                    Application.LogMessage( mapparam.FullName + " parameter supports objects of "+ maps[i].Type );
            } else {
                    Application.LogMessage( mapparam.FullName + " parameter does not supports objects of "+ maps[i].Type );
            }
    }
    // Expected results:
    //INFO : grid.Scene_Material1.Phong.ambient_blend.Softimage.map parameter supports objects of wtmap
    //INFO : grid.Scene_Material1.Phong.ambient_blend.Softimage.map parameter supports objects of vertexcolor
    //INFO : grid.Scene_Material1.Phong.ambient_blend.Softimage.map parameter supports objects of uvspace
    //INFO : grid.Scene_Material1.Phong.ambient_blend.Softimage.map parameter supports objects of TextureProp
    //INFO : grid.Scene_Material1.Phong.ambient_blend.Softimage.map parameter does not supports objects of rendermap

### See Also

Parameter.GetInstanceValue Parameter.SetInstanceValue Parameter.HasInstanceValue