V-Ray 1.5 Service Pack 4 available for download

It's a free upgrade to all current V-Ray customers - get it here: http://www.chaosgroup.com/en/2/downloads.html

From the Chaosgroup site:

Modified features:

• Improved multithreading on multi-core machines;
• Ability to specify gizmo falloff for VRayEnvironmentFog;
• Ability to use arbitrary meshes as gizmos for VRayEnvironmentFog;
• Option to exclude the background from VRayEnvironmentFog;
• Added CIE sky models to the VRaySun and VRaySky;
• It is now possible to submit DR servers list for DR through backburner;
• Added option to not use area speculars in the VRayIES light;
• Added Kelvin temperature settings for the color of VRayLights;
• VFB history is now turned off when 3ds Max is in slave mode;
• Output .vrimg and split channel paths are listed in the Asset Tracker;
• GI cache files (irradiance maps, light cache etc) are listed in the Asset Tracker.

Bug fixes:

• DR fails with large .max files;

• Crash with Remove button for gizmos and lights in VRayEnvironmentFog;

• Crash with Hair&Fur in 3ds Max Design 2010;

• Issue with Arch&Design materials in multi/sub-object material;

• It should not be possible to export already created VRayProxy objects as .vrmesh files;

•  Fixed invalid colors with texture-mapped lights when the texture contains black areas;

•  Fixed occasional license errors with codes (-209), (-9) and (1000) on slow networks

•  Fixed a crash when using a combination of VRayLightMtl materials and VrayDirt with "Work with  transparency" enabled;

• Cloning the V-Ray renderer did not clone the override material exclusion list;

• Fixed problems with velocity channel and objects close to the camera;

• VRayToon was black on directly visible dome lights;

• Fixed issue with VRayToon and opacity mapped objects;

• Fixed a problem with hilights in VRayFastSSS2 material;

• Fixed different buckets with interpolated glossy reflections and DR;

• Multi-matte render element did not work with VRaySphereFade;

• Fixed crash with DR in specific cases;

• The MaxScript for exporting .vrscene files now exports "RGB Multiply", "RGB Tint", "ColorCorrect"  and  "ColorCorrection" textures;

New Feature:

• An added new feature in V-Ray 1.50 SP4 is V-Ray Ambient Light.

Compatibility:

• Works with Autodesk® 3ds Max® 8, Autodesk® 3ds Max® 9, Autodesk® 3ds Max® 2008, 3ds Max® 2009, Autodesk® 3ds Max Design 2009, Autodesk® 3ds Max® 2010, Autodesk® 3ds Max® Design 2010.
• 32 Bit and 64 Bit versions are available

 
VRay-SP4 CIE Clear sky model test from Chris Jackson on Vimeo.