Getting Started with Arnold GPU

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Supported Features

Arnold core features

Arnold GPU supports a set number of Arnold features, including arbitrary shading networks, SSS, hair, atmospherics, instancing, and procedurals. See here for a detailed list of Arnold GPU features and known limitations.

C4DtoA features and known limitations

  • Arnold Object Mask tag is not supported

  • Arnold Custom AOV tag is not supported

  • Light linking (Include/Exclude objects on the Project tab) is not supported
  • Turbulence FD and X-Particles volumes are not supported
  • C4DtoA specific shaders from previous versions (prior 2.5.0) are not supported (e.g. when loaded from a previously exported ASS file via an Arnold Procedural):
    • normal_displacement
    • vector_displacement
    • mesh_light_material (visible mesh light)
    • c4d_vertex_map (Vertex Map)
    • xparticles

System Requirements

Arnold GPU works on NVIDIA GPUs of the Turing, Volta, Pascal, and Maxwell architectures. Multiple GPUs will improve performance, and NVLink can be used to connect multiple GPUs of the same architecture to share memory (On Windows, we recommend enabling SLI as well).
See the full list of supported GPUs.

Recommended NVIDIA drivers: 

NVIDIA Driver Downloads

Pre-populating the GPU cache 

The very first time you render with the GPU, the GPU renderer has to create a cache of shaders. This can delay the time to the first pixel for your first render.

To avoid the one-time delay, we recommend that you run Pre-Populate GPU Cache before you do any renders. Note that pre-populating the cache can take up to 15 minutes.

The cache only 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.

Selecting a Render device

You can easily switch between CPU and GPU with a single click in the System render settings. 

Matching Noise on CPU and GPU

Matching noise can take a little experimentation because Arnold GPU uses Camera (AA) sampling only. We recommend you also use Adaptive sampling. Here are some guidelines:

  • Set the Max. Camera (AA) in the range of 30 to 50 (depending on the scene, you might go closer to 100). In general, the max samples should be a large value. A large max samples means that the quality is controlled by the noise falling under the threshold, instead of by clamping to the max AA.
  • Set the Adaptive Threshold to something like 0.015 or 0.02. For a noise-free render, lower the threshold value, maybe even as far as 0.010.
  • Set the Camera (AA) samples to around 3 or 4. One of the few reasons to go higher with AA is for motion blur. The higher the number of Camera (AA) samples, the less of a speedup you'll get from adaptive sampling.

Textures

All textures must fit in memory. We recommend you use tiled and mip-mapped TX textures. If you're running out of memory, you can set a maximum resolution for textures in the Render Settings.

 

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