Some features have been modified in V-Ray 6.0 compared to previous versions of V-Ray. The sections below provide you with more details on what has been changed to help your transition to using the latest version.
There is a slight difference between renders containing textured fog with version 5 and version 6. The discrepancy can be fixed by lowering the Step size parameter.
VRayMtl's reflection now has a new GTR Compensation Energy option that affects reflective and especially metallic materials' appearance.
VRayMtl's Double-Sided option is removed from the UI. Older scenes with this option enabled, will render correctly. To disable the option, you can use the following MEL command: setAttr "VRayMtl1.doubleSided" 0.
Some features have been modified in V-Ray 5.0 compared to previous versions of V-Ray.
With V-Ray 5 for Maya, V-Ray Quick Settings are removed from the user interface. If the V-Ray Quick Settings are used in older scenes, they will open with the correct parameters set. The default V-Ray settings are optimized to provide the best starting point, removing the need for additionally using the Quick Settings.
Local subdivs - V-Ray 5 automatically determines the shading sampling in the scene. The only settings that need changing are the image samples. With this change, the Local subdivs are hidden from the user interface for all lights and materials. Scenes from previous V-Ray versions will use the automated shading sampling when rendered in V-Ray 5.
VRayHair3Mtl is no longer exposed in the UI, but loads correctly with older scenes. It is recommended to use the VRayHairNextMtl material instead.
VRayFastSSS2 material no longer supports the Front and Back Lighting options, which are now removed, as they were only used for the already deprecated pre-pass-based illumination modes.
Glossy Fresnel option is removed from the UI of VRayMtl and VRayToonMtl. It is always considered as enabled, even for older scenes with the option disabled.
Normal Opacity mode of VRayMtl is deprecated. The default Opacity mode Stochastic is considered for older scenes.
Reflection and Refraction Exit Colors are removed from VRayMtl and VRayToonMtl.
The Soften Edge option is removed from VRayMtl and VRayToonMtl.
The Invert Normal options in VRayDirt is now hidden from the UI. Old scenes with this option enabled will still show it. For newer scenes, the option can be enabled using the following MEL command:
setAttr VRayDirt1.invertNormal 1
Starting with V-Ray 5, update 2, there is a new way in which anisotropy is calculated. The new physically-based anisotropy corresponds to an actual anisotropic micro surface.
Sharp mip-map filtering is used by default for file textures instead of the previously default Smooth with mipmap. Note that adding the extra V-Ray Texture Filter attribute overrides the filter type.
When user attributes are used at the beginning of a file path, V-Ray treats the path as absolute. To mimic the old behavior, use the fake user attribute <PROJECT_PATH> that forces the path to be interpreted as relative.
Starting with V-Ray 5, update 1, Float textures that have been previously accessible from Create V-Ray PluginNode > Texture, can now be created from Create V-Ray PluginNode > Float texture.
Some light options are no longer exposed in the UI. If an old scene containing any of these options is rendered, they use their default values as follows:
MIS - always on;
Store with Irradiance Map - always off;
Tex Adaptive - always on;
Use Ray Distance - always off;
The Skylight portal option is no longer available for the VRayLightRect and VRayLightMesh lights. To add some extra light to an interior scene, you can use an invisible light instead. V-Ray 5 will automatically offer to migrate scenes with light portals to a compatible setup that uses the Adaptive Dome light. The migration can also be run manually from the V-Ray menu > Tools > Migrate Legacy Scenes. Read more about legacy Light Portal migration.
The No Decay option is available only for old scenes that have the option enabled.
Starting with V-Ray 52001, V-Ray Lens Effects are applied in the RGB channel together with other post effects. When either a Denoiser render element is used or Source LightMix or Composite mode, then the lens effects are applied to the effectsResult channel. Alternatively, enable the Create effectsResult channel option.
Shade Map for Stereoscopy is now obsolete and its attributes can no longer be added to a camera. Although they do remain present in older scenes, they cannot be exported.
The out-of-process option for IPR is removed from the UI. Historically, it was the first implementation of IPR in V-Ray for Maya and it internally used DR with a locally spawned server to communicate and render the scene changes.
IPR is now always rendered in-process, which brings better interactivity and uses far less memory.
Irradiance Map GI Engine is no longer available for newly created scenes with V-Ray 5. Older scenes that use this method will render properly.
Brute Force GI Engine is always used for Primary bounces.
GI is now enabled by default for new scenes.
The Light Cache World Scale option is removed from the UI. Old scenes with this option enabled will render as expected.
Bitmap caching between renders is now enabled by default to speed up every render after the first one. This affects both new and old scenes.
Use Embree is always enabled. Use Embree, Use Embree for motion blur, and Use Embree for hair options are enabled by default now and removed from the UI. Old scenes with disabled Embree now automatically load with enabled Embree options.
Max tree depth, Min leaf size, and Face/level coeff parameters are enabled by default now and removed from the UI. These settings are only used when Embree is disabled. In V-Ray 5, Embree is always used.
Min Shading Rate is removed from the interface and always uses the default value of 6. This is the optimal value for V-Ray and changing it usually comes at the expense of performance. Old scenes saved with a non-default value can still be adjusted.
The Linear Workflow option from the Advanced Color Mapping Settings in the V-Ray tab is removed from the UI. It is no longer available for new scenes. V-Ray 5 will automatically offer to migrate scenes with light portals to a compatible setup that adds gammaCorrect nodes. The migration can also be run manually from the V-Ray menu > Tools > Migrate Legacy Scenes. Read more about legacy Light Portal migration .
The Dynamic Bucket Splitting option for the Bucket Image Sampler is removed from the UI. It is always treated as enabled.
Installation from ZIP
V-Ray 5, update 1 introduces some changes to the environment setup for zip installations.
There are changes to the PATH environment variable on Windows OS, DYLD_LIBRARY_PATH on macOS, LD_LIBRARY_PATH on Linux, as well as the MAYA_RENDER_DESC_PATH on all operating systems.
For more information, see the Installation from zip page.
Starting with V-Ray 5, update 1, the Sinc Anti-aliasing filter is removed from the UI. Old scenes using the Sinc filter will automatically be set to the default one - Lanczos.