September 20 2014This version uses the Arnold 4.2.1.2 core.## HIGHLIGHTED NEW FEATURES

• EXR overscan support.
• Improved sampling (textured quad lights, Cook-Torrance specular and refraction).
• Reduced IO for shadow ray and rough glossy texture lookups.
• A new light manager .
• New Volume primitive, with OpenVDB support.

HIGHLIGHTED IMPROVEMENTS

• Volume collector to support the new volume primitive.

NOTES

• FumeFX extension is now handled by Sitni Sati and can be downloaded through their support page.

INCOMPATIBLE CHANGES

• Difference in microfacet BTDFs: Rough refraction viewed at grazing angles or using Phong-smoothed normals renders slightly darker now, especially for high roughness values. This affects the standard shader and AiMicrofacetBTDFIntegrate(), and fixes a bug in the previous BTDF sampling.