/*

	This example creates a generator operator and then moves

	its read positions across various construction modes.

*/

NewScene(null, null);

Sphere = CreatePrim("Sphere", "MeshSurface", null, null);

//Create a twist operator in modeling construction mode

TwistOp = ApplyOp("Twist", Sphere, 3, siPersistentOperation, null, 0);

//Envelope the shere with a Null (animation construction mode),

//and move the Null so we can see the difference:

NullObject = GetPrim("Null", null, null, null);

EnvOp = ApplyFlexEnv(Sphere + ";" + NullObject, false, 2);

Translate(NullObject, 4, 0, 0, siRelative, siView, siObj, siXYZ, null, null, null, null, 

	null, null, null, null, null, 0);

//Generate a subdivided sphere from this one

MeshSubdivideWithCenter(null, "sphere", null, siPersistentOperation, siKeepGenOpInputs);

GeneratorOp = GetValue("polymsh.polymsh.MeshSubdivideWithCenter");

logmessage( "Construction region after generator creation: " + 

			GetGeneratorInputReadPosition( GeneratorOp ) );

//Currently, the generated sphere inherits from the animated (result)

//position, since by default it connects in secondary shape construction mode.

//We will now move the read point over the modeling marker so it has

//has twisted but not enveloped positions:

ChangeGeneratorInputReadPosition( GeneratorOp, siConstructionModeModeling, 0 );

logmessage( "Construction region after moving in modeling: " + 

			GetGeneratorInputReadPosition( GeneratorOp ) );

//Transfer the envelope operator onto the generated sphere:

TransferClusterPropertiesAcrossGenOp("polymsh.polymsh.MeshSubdivideWithCenter", "polymsh", 

	"sphere.polymsh.cls.EnvelopWeightCls.Envelope_Weights", "Envelope_Weights", true);

//Move the read position to animation mode, but specify to untransfer

//the envelope in order to avoid the double deformation:

ChangeGeneratorInputReadPosition( GeneratorOp, siConstructionModeSecondaryShape, 0 );

logmessage( "Construction region after moving back in secondary shape: " + 

			GetGeneratorInputReadPosition( GeneratorOp ) );

//Output:

//	INFO : Construction region after generator creation: 3

//	INFO : Construction region after moving in modeling: 0

//	INFO : Construction region after moving back in secondary shape: 3