DRF is the file format for VIZ Render, a rendering tool included with Autodesk Architectural Desktop 2005. The DRF file type is similar to MAX files from previous versions of Autodesk VIZ.
This file format is available only when you use the File menu > Open command. All DRF files must be saved as MAX files in Autodesk VIZ. Likewise, DRF files cannot be imported or merged into Autodesk VIZ scenes.
Note: You can open DRF files using drag-and-drop functionality.
DRF files must be saved as MAX files in Autodesk VIZ.
Important: Once you save a DRF file in Autodesk VIZ, it becomes a MAX file and you can no longer open it in VIZ Render.
In VIZ Render, you can only use meters as your system unit. However, Autodesk VIZ lets you define your own system unit, and how units are displayed. For more information on units, see Using Units and Units Setup Dialog.
Many times, when you open a DRF file, you will be presented with the Missing External Files dialog. To locate the missing files, add the appropriate VIZ Render directories to the Configure Paths dialog > External Files panel.
Linked objects show up as Linked Geometry objects on the Modify panel. These objects don't allow access to sub-object levels where minor editing can occur. If a linked geometry object is moved, rotated or scaled you do have the option to Reset Position.
Autodesk VIZ recognizes Linked Geometry objects when you open a MAX file created in VIZ Render. Since linked geometry objects offer no parameters on the Modify panel, you must first add an Edit Mesh modifier to the object or collapse the linked geometry object to an Editable Mesh in order to access sub-object levels. If you add a modifier to linked geometry, the modifier is applied to all instances of that object.
Linked Geometry objects are assigned a special LinkTM controller. If a the object is converted to an Editable Mesh, Poly, NURBS or Editable Spline, the LinkTM controller is replaced with a PRS controller.
There is no substitution modifier in Autodesk VIZ. However, if you open a DRF file with substituted objects, Autodesk VIZ will recognize the substitutions and will add the substituted objects into the scene.
Some of the user interface elements in Autodesk VIZ are not where you would expect them if you are coming from VIZ Render. For example, the viewport controls are in the bottom-right corner, instead of the top-left.
For more information on the user interface, see User Interface.
The Render Presets in Autodesk VIZ are very different from the presets in VIZ Render. For more information on using them, see Preset Rendering Options.