const [Instance](API\Plugins\MutableRuntime\MuR\Instance) * BeginUpdate ( [Instance::ID](API\Plugins\MutableRuntime\MuR\Instance\ID) InstanceID, const [Ptr](API\Plugins\CustomizableObject\MuCO\Ptr)< const [Parameters](API\Plugins\MutableRuntime\MuR\Parameters) > & Params, int32 StateIndex, uint32 LodMask )