There are two ways to do this: by using the supplied standalone device selection tool, accessible from both the V-Ray Tools menu and the Start menu search, or from the Asset Editor's GPU device dropdown list. You may not want to use all available GPU devices for rendering, especially if you have multiple GPUs and you want to leave one of them free for working on the user interface or you may want to combine your CPU and GPU together (see the Hybrid Rendering section below). Choosing Which Devices to Use for Rendering The RTX engine type only works with NVidia RTX cards.

To see if the V-Ray render server is really rendering on the GPU, check out its console output. If V-Ray GPU cannot find a supported RTX device on the system, the process stops. If V-Ray GPU cannot find a supported CUDA device on the system, it silently falls back to CPU code. See the sections below to learn how to choose devices on which to run IR GPU.

Rendering on multiple GPUs is supported, and by default, Interactive rendering for GPU uses all available GPU devices. Using the Select Devices for V-Ray GPU Rendering you can enable your CPUs as CUDA devices and allow the CUDA code to combine your CPUs and GPUs to utilize all available resources.

Hybrid Rendering (running CUDA on GPU and CPU): Starting with V-Ray 3.6, V-Ray GPU CUDA rendering can be performed on CPUs and NVIDIA GPUs at the same time.

NVIDIA RTX – Choosing RTX GPU mode works with RTX cards.

See here if your card has the minimum required compute capability. Rendering on multiple GPUs is also supported.

NVIDIA – The CUDA engine is supported only in 64-bit builds of V-Ray for Maxwell and later NVIDIA cards.

You can use it with both Progressive and Bucket Sampler types. To enable GPU rendering, from V-Ray Asset Editor → Settings tab → Render rollout, select CUDA or RTX engine. It also supports both the Progressive and Bucket Image Samplers. V-Ray GPU can be used as a production render or in interactive mode to quickly preview scene changes. This is why, it is strongly recommended to not switch between engines in the middle of your project - if you start setting up a scene with the regular V-Ray engine, use it for the entire project. The render settings will only show the available options and your scene will be optimized for GPU rendering.

Furthermore, it is not the goal for them to be the same. The supported features of V-Ray GPU running on CUDA and RTX are the same.Īlthough CUDA and RTX share the same user interface as the V-Ray engine, V-Ray GPU differs from the regular V-Ray engine in the way it performs certain calculations. Comparing the results will never come to a one-to-one match, although it may look quite close.

Vray rhino interior render settings