setupShadowPosition( { context, material } ) {

		// Use assign inside an Fn()

		shadowPositionWorld.assign( material.receivedShadowPositionNode || context.shadowPositionWorld || positionWorld );

	}
Setups the shadow position node which is by default the predefined TSL node object `shadowPositionWorld`.

@param {NodeBuilder} object - A configuration object that must at least hold a material reference.