This page provides information on how the latest version of V-Ray handles scenes saved with previous versions of V-Ray.
Overview
V-Ray 5 adds a number of rendering optimization features. However, for compatibility reasons, some features and workflows have been adjusted and are discussed in detail below.
V-Ray for SketchUp is not forward-compatible, meaning projects done with V-Ray 5 are not guaranteed to work with V-Ray Next or older versions. If a project is opened using an older V-Ray version than the one it was created with a prompt message will offer wiping all V-Ray data to ensure file stability.
V-Ray 5 for SketchUp licenses also work with V-Ray Next, allowing anyone who purchases an upgrade to complete unfinished projects using V-Ray Next if needed.
Lights (V-Ray 5)
The Portal Light option in V-Ray Rectangle light is now considered a legacy option and is no longer exposed in the UI. Rectangle lights in files saved with previous V-Ray versions and this option enabled will still display have it available. Regardless, for best performance consider disabling it and using the Adaptive Dome Light option instead.