V-Ray 3.0 adds a number of rendering optimization features. However, for compatibility reasons, some features and workflows have been adjusted and are discussed in detail below.
Please note that V-Ray for Rhino versions older than 2.0 are no longer supported. Materials and other V-Ray data will not be read. If you need to migrate an outdated scene, please request a complimentary temporary v2.0 license by sending an email at email@example.com . This will allow you you will need to perform a 2-step migration - first one to v2v3.0 60.02 and a second one from v2.0 to the v3.660.03.
To do so, first visit download.chaosgroup.com, enable the "Show older versions" checkbox and download V-Ray 3.60.02. Then, uninstall V-Ray for Rhino and install v3.60.02 instead.
Open your outdated project, inspect the scene materials through the V-Ray Asset Editor and save the project. This will trigger the automatic V-Ray data migration. Finally, install V-Ray 3.60.03 again.
Opening a Scene
When a scene saved with V-Ray 2 is loaded in Rhino (using V-Ray 3), an upgrade script will go through all the scene assets and features to account for incompatibilities. All lights, materials, and special objects will be upgraded from groups to a new component definition system. This upgrade can take some time, but only happens the first time the scene is opened in Rhino with V-Ray 3. When the scene is saved, the updates are saved with it.