/*
	This example illustrates how to use the OutputPort.Value property within 
	the context of the _Update function of a runtime scripted operator
*/
NewScene( null, false );
var oObject = Application.ActiveSceneRoot.AddGeometry( "Sphere", "MeshSurface" );
apply_taper( oObject );
// This is the _Update callback used for the 'MyTaper' runtime operator
function MyTaper_Update( ctx, Out, InGeom )
{	
	// Get the taper factor.
	var dFactor = ctx.Parameters("Factor").Value
	// Get the array of point positions.
	var aPnts = InGeom.Value.Geometry.Points.PositionArray.toArray();
	// Taper
	for ( var i = 0; i < aPnts.length / 3; i++ )
	{
		var dTaper = (1 - ( aPnts[1 + (i*3)] * dFactor ))
		aPnts[0 + (i*3)] = aPnts[0 + (i*3)] * dTaper;
		aPnts[1 + (i*3)] = aPnts[1 + (i*3)];
		aPnts[2 + (i*3)] = aPnts[2 + (i*3)] * dTaper;
	}
	// Set the points by accessing the geometry via
	// the OutputPort.Value property
	Out.Value.Geometry.Points.PositionArray = aPnts;
}	
// This function creates the 'MyTaper' operator on the fly and then connects it
// immediately to the input object.
function apply_taper( oObject )
{
	var op = XSIFactory.CreateScriptedOp( "MyTaper", MyTaper_Update.toString(), "JScript" );
	// Define connections
	var ioport = op.AddIOPort( oObject.ActivePrimitive, "Geom" );
	// Define parameters
	var pdef = XSIFactory.CreateParamDef2( "Factor", siDouble, 0.5, 0, 1 );
	op.AddParameter( pdef );
	// Connect operator
	op.Connect( oObject );
}