ヒントとテクニック

// ...Creation Code...
	var code = GeometryDeform_Update.toString();
	g_sop = XSIFactory.CreateScriptedOp( "GeometryDeform", code, "JScript" );

	var p1 = g_sop.AddIOPort( g_prim, "", 0, -1, siBranchGroupPort  );			
	var p2 = g_sop.AddInputPort( g_obj.posy, "", 0, -1, siBranchGroupPort  );			

	g_sop.Connect(g_obj);

// Notice that the port connections are passed in as arguments to Update
function GeometryDeform_Update( ctx, Out, Inpolymsh, Inposy )
{
	Application.LogMessage( "GeometryDeform_Update: " + Out.TargetPath + ":" + Inposy.TargetPath );
	
	var arr = Inpolymsh.Value.Geometry.Points.PositionArray.toArray();

	for ( var i=0; i<arr.length; i=i+3 )
	{
	  var x = arr[0+i];
	  var z = arr[2+i];
	  var y = 0;
 
	  var x0 = x;
	  var z0 = z + 1;
	  var l = Math.sqrt(x0 * x0 + z0 * z0)
	  var dif = l - Inposy.Value // In2 can be any value, e.g. posx
	  dif = dif * dif;
	  dif = Math.sqrt(dif);
	 
	  if ( dif < 1 ) {
		y = y + (1 - dif);
	  }
 
	  arr[1+i] = y;
	}
	Out.Value.Geometry.Points.PositionArray = arr;
}

//... from Creation Code (where prim is primitive of a sphere mesh)...
	var op = XSIFactory.CreateObject( "CppGeometryDeform" ) ;

	op.AddIOPort( prim, "", 0, -1, siBranchGroupPort ) ;
	op.AddInputPort( obj.posy, "", 0, -1, siBranchGroupPort ) ;

	op.Connect( ) ;
...

// Notice that only the context object is an argument to Update
function CppGeometryDeform_Update( in_ctxt )
{

	// The OperatorContext gives you access to the input ports
	var prim = ctxt.GetInputValue( 0 /* input primitive of IO port*/ ) ;
	var posyVal = ctxt.GetInputValue( 1 /* posy param */) ;

	var inGeom = prim.Geometry ;
	var arr = inGeom.Points.PositionArray.toArray() ;

	for ( var i=0; i<arr.length; i=i+3 )

	{
	  var x = arr[0+i];
	  var z = arr[2+i];
	  var y = 0;
 
	  var x0 = x;
	  var z0 = z + 1;
	  var l = Math.sqrt(x0 * x0 + z0 * z0)
	  var dif = l - Inposy.Value // In2 can be any value, e.g. posx
	  dif = dif * dif;
	  dif = Math.sqrt(dif);
	 
	  if ( dif < 1 ) {
		y = y + (1 - dif);
	  }
 
	  arr[1+i] = y;
	}

	// The OperatorContext gives you access to the output ports
	var outPrim = ctxt.OutputTarget ;
	outPrim.Geometry.Points.PositionArray( arr ) ;

	return CStatus::OK ;
}

//... from Creation Code (where prim is primitive of a sphere mesh)...
	CustomOperator op = Application().GetFactory().CreateObject( L"CppGeometryDeform" ) ;

	op.AddIOPort( prim, L"", 0, -1, siBranchGroupPort ) ;
	op.AddInputPort( obj.GetParameters().GetItem( L"posy" ), L"", 0, -1, siBranchGroupPort ) ;

	op.Connect( ) ;
...

// Notice that only the context object is an argument to Update
XSIPLUGINCALLBACK CStatus CppGeometryDeform_Update( CRef& in_ctxt )
{

	OperatorContext ctxt( in_ctxt ) ;

	// The OperatorContext gives you access to the input ports
	Primitive prim = ctxt.GetInputValue( 0 /* input primitive of IO port*/ ) ;
	double posyVal = ctxt.GetInputValue( 1 /* posy param */) ;

	Geometry inGeom = prim.GetGeometry() ;
	CVector3Array posArray = inGeom.GetPoints().GetPositionArray();

	for ( LONG i=0 ; i<posArray.GetCount(); i++ )
	{
			CVector3& pos = posArray[i] ;
			pos.PutY( 0.0 ) ;

			CVector3 pos0( pos.GetX(), 0.0, pos.GetZ() + 1.0 )  ;
		
			double l = pos0.GetLength() ;

			double dif = l - posyVal ;
				
			if ( dif < 0 )
				dif = -dif ;

			if ( dif < 1 )
				pos.PutY( 1 - dif ) ;				
	}

	// The OperatorContext gives you access to the output ports
	Primitive outPrim = ctxt.GetOutputTarget() ;
	outPrim.GetGeometry().GetPoints().PutPositionArray( posArray ) ;

	return CStatus::OK ;
}