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Global light Sampling support on GPU:Global Light Sampling (GLS) is now available with GPU rendering. Many scenes with moderate to large number of lights render 2-6x faster with GLS. Scenes that do not benefit from GLS tend to be a few percent faster or slower. See theGLS documentationfor important information on the optimal number of light samples to use with GPU. (ARNOLD-13109)
Speedup over 7.2.2 GPU version using 1 light sample
City (100000 lights)
Classical interior (80 lights)
Automotive studio (9 lights)
48x speedup
2x speedup
2.6x speedup
Return direction and distance to nearest hit in distance shader:Arnold 7.2.3 addsout_distanceandout_directionoutput parameters to thedistance shader, which return the direction and distance to the nearest surface, respectively. The shader still returns the color-mapped result by default, which is now available as theout_rgbparameter. (ARNOLD-13473)
distance shading effect
Tutorial - Building facade fire damage
Tutorial - Eye makeup shading effect
state_float, state_int, state_vector multiple outputs:Theshading state shadersnow have multiple outputs, so you can use a single state shader with multiple output connections in a shading network. (ARNOLD-13579)
USD Enhancements
Support vertex UV coordinates on Curves in the render delegateusd#1435
Curves without width should render with a default valueusd#1579
API Additions
AiProceduralExpand: A new APIAiProceduralExpandexpands on demand the contents of a procedural (such as a 'usd', 'alembic', or 'procedural' node), as it would happen in a regular render. You can use this to force the creation of procedural child nodes before the rendering starts, and to avoid race conditions when the procedurals are not thread safe. (ARNOLD-7067)
Bug Fixes
ARNOLD-10643 - FIS no longer forces a box filter
ARNOLD-12917 - Viewport API uses incorrect motion blur reference time
ARNOLD-13645 - Instancer crash if a single node is instanced but set to null
ARNOLD-13678 - Holes in alpha channel when opacity is almost 1
ARNOLD-13741 - Log messages missing colors
ARNOLD-13770 - Name scope clashes with nested procedurals
ARNOLD-13776 - NaNs when using global light sampling with low-light-threshold
ARNOLD-13789 - Corrupted tiff output if skip_alpha and unpremult_alpha are both enabled
ARNOLD-13908 - Windows and macOS license failed when using single-user and network Arnold licenses
Windows 10 or later, with the Visual Studio 2019 redistributable.
Linux with at least glibc 2.17 and libstdc++ 4.8.5 (gcc 4.8.5). This is equivalent to RHEL/CentOS 7.
macOS 10.13 or later.
x86-64 CPUs need to support the SSE4.1 instruction set. Apple Mac models with M series chip are natively supported.
GPU rendering works on Windows and Linux only and requires an NVIDIA GPU of the Ampere, Turing, Volta, Pascal, or Maxwell architecture. We recommend using the525.89 or higher driverson Linux and528.49, or higheron Windows. SeeArnold GPUfor more information.
For GPU rendering, the cache also needs to be re-populated after installing a new Arnold version,updating to a new NVIDIA driver, or changing the hardware configuration of GPUs on the system. More information can be foundhere.