Radeon ProRender

Full Spectrum Rendering in RPR for Maya

Full spectrum rendering (FSR) provides artists with a rendering framework that can be easily scaled from super-fast rasterized to fully path traced, all with physically accurate materials and lighting.

FSR aims to fill the gap between the OpenGL viewports and full path-tracers . It uses Vulkan to achieve fast rendering with rasterization and to increase the rendering performance using the GPU. It also allows artists to add ray tracing effects for advanced viewport rendering, or switch to Vulkan-powered biased ray tracing or OpenCL full path tracing rendering modes.

FSR is meant to help artists to obtain a more interactive experience for viewport rendering and accelerate their work as much as possible, while maintaining physically correct lighting and shading. By switching between the FSR modes, users can easily balance the ray tracing visual quality against the rasterization performance based on their needs.

The Render Modes in Detail

FSR offers four render modes to support all stages of the rendering pipeline —from standard viewport creation to the final quality render.

Render Mode Powered by Runs on Description
Low Vulkan GPU High-performance rasterization mode for standard viewport creation. This is the fastest of all the modes, and is highly optimized for changes in geometry, material and lighting. Global Illumination effects will be less visible in this mode.
Medium Vulkan GPU Hybrid mode for advanced viewport creation: rasterization with biased GI. This mode adds ray traced effects, such as reflection, refraction, ambient occlusion, etc.
High Vulkan GPU Vulkan-powered ray tracing mode for look development and biased photorealistic rendering.
Full OpenCL CPU/GPU OpenCL full path tracing mode, which is optimal for final quality renders, and for rendering complex scenes and materials.

Supported Hardware

Three of the four FSR modes run on top of Vulkan. Therefore, a Vulkan-compatible GPU is required.

Officially supported GPUs for Vulkan-powered FSR modes are:

  • AMD Radeon™ PRO W6000 Series (Radeon PRO W6800, Radeon PRO W6600, and Radeon PRO W6600M)
  • AMD Radeon Vega (Radeon Pro WX 9100, Radeon RX Vega 8/56/64/64 Liquid Cooled and subsequent models)
  • AMD Radeon 2nd generation Vega (AMD Radeon VII and subsequent models)
  • AMD Navi class cards (Radeon RX 5700 XT/RX 5700/RX 5000, Radeon Pro W5500, AMD FirePro W5000 and subsequent models)
  • Limited support for Polaris cards Radeon RX 500 series as well as Radeon Pro WX 7100 and WX 3200

Apart from these, FSR may run on other GPUs that are not officially supported.

Note

If no GPU is detected on the system or the detected GPU does not support Vulkan-powered FSR modes, AMD Radeon ProRender will use its default Full OpenCL ray tracing mode, and the other FSR modes will not be available.

Supported Platforms

  • FSR is supported only for Windows 10
  • On macOS, only the Full mode is supported.

Choosing Render Quality Mode

FSR modes are available in both the viewport and the final render. By choosing between the render quality modes, users can balance the visual quality of the output against performance based on their needs.

To choose the render quality mode:

  1. Open the Render Settings window.
  2. Switch to the Quality tab.
  3. In the Final Render Quality and Viewport Render Quality sections, choose the necessary FSR mode.

Limitations

In terms of supported plug-in features, FSR Vulkan-powered modes are somewhat different to the OpenCL full path tracing mode. While the OpenCL path tracer supports all of the plug-in features, FSR modes that run on top of Vulkan have a set of limitations. These limitations are outlined below.

Quality

Render Quality can be controlled using the Total Ray Depth parameter.

Ray depth values for some specific surface types) as well as Ray Cast Epsilon, Clamp Radiance options are not supported.

Sampling

  • The only supported sampling mode is fixed sampling. Adaptive sampling is not supported.
  • Tiled rendering is not supported.
  • Anti-aliasing filters are not supported.

Render Passes (AOVs)

Supported render passes are:

  • Depth
  • UV
  • Object Index
  • Material Index
  • World Coordinate
  • Shading Normal
  • Diffuse Albedo
  • Background

No other render passes are available in the UI when you switch to any of the FSR Vulkan-powered modes.

Viewport Render Modes

Render modes in the viewport are not supported.

Lights

  • Since they are adapted for Vulkan-powered modes, some of the light sources and their parameters might look a bit different than in the OpenCL full path tracing mode.
  • For the area light source, only the rectangular shape is supported.

Camera Effects

Motion blur and depth of field effects, as well as camera shift are not supported.

Denoiser

All denoiser filters are supported, except for the Machine Learning filter.

Note that FSR Low and Medium modes use denoising internally to speed up rendering, and yield little to no noise in the render output. The denoiser will mostly be required for the High FSR mode, as this mode might render noisy outputs.

Shading

The following nodes are not supported or only partially supported.

Node Details
Bump 2d Not supported.
File Only file input is supported.
Place2dTexture Only default tiling is supported.
RPR Ambient Occlusion Not supported.
RPR Blend Not supported.
RPR Arithmetic Not supported.
RPR Material Supported with limitations.
RPR Uber Supported with limitations.