OpenCL is an open framework utilized by AMD. CUDA was created by NVIDIA and is implemented on their cards. Both of these are graphics cards platforms. If you're new to the graphics card world then you may wonder what these even mean. You'll have noticed that V-Ray in the Engine Type dropdown gives you the option between OpenCL and CUDA. The dropdown box lets you specify exactly what hardware you want to utilize at that point in time GPU: OpenCL vs. Then on the V-Ray RT tab you can set the engine type to either CPU, or one of two GPU options: OpenCL or CUDA. With that done, click on the arrow at the bottom right of the render setup and select Active Shade Mode.

Under ActiveShade rendering, set it to V-Ray RT. To change to V-Ray RT you need to go to Render Setup and the Assign Renderer rollout. The version you use will depend primarily on how your GPU stacks up against your CPU. V-Ray RT is split into two versions, namely a version to run on the GPU and a version to run on the CPU. V-Ray has been revolutionizing rendering for years now and the improvements in V-Ray RT keep it firmly on the front line alongside other dedicated GPU renderers like Octane GPU or CPU? How long this will be I don't know, but if the improvements in the last few years are anything to go by then it won't be too many more years before it becomes a reality. It's really exciting to know that it is only a matter of time before it becomes completely viable to use real-time rendering techniques in every area of production and thereby removing the requirement for a production-only version. V-Ray RT has been around for quite a while now and it has been adopted in varying degrees by different artists and studios. In this article, we'll take a look at V-Ray RT in V-Ray 3.0 to see how we can make the most of it. It's important to note that, as graphics cards become even more powerful, it is becoming increasingly viable to render ‘production' quality visuals using this technique.

Obviously the more complex the light and materials the longer this will take to become acceptable, but it's fantastic for test renders where you want to get an idea of light levels, or light direction, or how your camera angles look. Hit render and your image will become increasingly ‘complete' in front of your eyes. V-Ray 3.0 offers us two primary options for real-time rendering: V-Ray RT and Progressive.

Paul Hatton takes a look at V-Ray RT and reveals how to make the most of it for test renders and improved efficiency V-Ray 3.0 packs a punch with its real-time rendering capabilities. We'll use aspects of this scene to look at the various new V-Ray 3.0 features. This will be our scene for the whole of this series of tutorials.

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