Creating a Light Part

	This task explains what a light object (also called light part) is and how you should use it. The procedure for creating a light part is explained in this task and in Creating a Part.
	You should build a part as a light object in order to save disk space and ensure faster loading of your documents. When you are adding a connector to a light part you do not need to select geometry, because light parts do not have the kind of geometry needed to add connectors.
	1.	Three types of parts can be created as light objects. These are: Weld Straight routable part Bendable To explain the difference between light and heavy part: When you place a "heavy" part (refers to a parametric part that is *not* created as a light object) in your document, you end up creating a separate document for each unique reference. This is not the case when you place a resolved part - the placed part simply points to the catalog and a unique document is not necessary. The light object approach applies the concept of a resolved part to a unique reference. When you build a part as a light object you do not create the geometry of the part. Instead you build the part, designate it as a light object, as described the section Building Parts, and place it in a catalog. When you place the part in a document this application will automatically create the visualization for it. You should also note that differing lengths of a placed light object do not result in the creation of a separate document for each placement. As an example, when you first place a 10-inch pipe in a document, a separate document is created for that part. However, when you place a 10-inch pipe again in the same document - whatever the length - a separate document is not created. All instances of a 10-inch pipe will refer to the first document that was created. You cannot change an existing "heavy" part into a light object. It must be initially created as a light object.
	2.	The procedure for creating a light part is similar to that of creating a heavy part with one important difference. Since light parts do not have a graphic to begin with, you need to start by creating a type for the part. Click the `Build Part` button to display the `Create Part` dialog box. Click the `Display Class Browser` button next to the `Component Type` field. The Class Browser appears. The Class Browser allows you to select the type of part you want to create. Navigate to the type you want by clicking on the "plus" sign next to each directory, or by using the three navigation buttons at the bottom. You can also filter for certain types. For instance, you can enter "elbow" in the Filter field and select enter to see all elbow types. Click `OK` after making your selection. If you select a type in the class browser that can be created as a light part then the `Create Part` dialog box will display a checkbox `Make light object` . The default is checked. If you do not want to create a part as a light object then uncheck this. Follow Step 5 onward in the task Creating a Part.
	3.	Object naming rules FOR HVAC DUCTS If you want to place 'heavy' HVAC ducts then you need to change the file that defines the object naming rules. (You do not need to make any change if you are placing 'light' parts.) If you are placing heavy parts then navigate to the directory `...intel_a\startup\EquipmentAndSystems\HVAC\DataDictionary`. The default files are named `sch-CATHvaHVACXXXXDuct1.xml` where XXXX represents a shape like FlatOval. Rename this file so that the application does not recognize it - you can add a `SAVE` at the end, for instance. You need to use the corresponding file that has the `_HV` at the end of the file name. This file is in the same directory, and normally directly beneath the file for light parts. To use this file simply remove the `_HV`. As an example: Rename `sch-CATHvaHVACXXXXDuct1.xml` to `sch-CATHvaHVACFlatOvalDuct1_SAVE.xml` Remove the `_HV` from the file `sch-CATHvaHVACFlatOvalDuct1_HV.xml`