Renders vray how to#
In this tutorial we'll learn how to best utilize these Primary and Secondary Samples to get the highest quality render (lowest amounts of Noise) in the fastest amount of time. So Subdivs 2 = Samples.įor example: 8 Subdivs = 64 Samples. The square root of the actual number of Samples. The samples controlled by V-Ray's DMC Sampler, which is specialized in figuring out a scene's Lighting, Global Illumination (GI), Shadows, Material Reflection & Refraction, and Sub-Surface Scattering (SSS). The samples controlled by V-Ray's Image Sampler (also known as Anti-Aliasing or AA), which is specialized in figuring out a scene's geometry - as well as textures, depth of field, and motion blur. ( Noise Threshold is named Adaptive Threshold in V-Ray for Maya) The amount of Secondary Samples sent out into the scene is mainly controlled by the Subdivs settings from individual Lights / Global Illumination / Materials in the scene, and the Noise Threshold setting of the DMC Sampler. The amount of Primary Samples sent out into the scene is mainly controlled by the Min Subdivs, Max Subdivs, and Color Threshold settings of the Image Sampler. So in order to reduce noise, you need to provide V-Ray with more information - and to provide V-Ray with more information, you need to take more samples.
Noise present in a render means that V-Ray wasn't able to gather enough information about what's going on in a scene. You see, Noise is caused by a lack of information. The more a scene gets sampled, the more information V-Ray is able to gather about the scene, and the higher quality the render will be - which means less Noise in the render. In order to accurately figure out what's going on in a scene, many Primary and Secondary Samples are needed to be taken. These additional rays are called Secondary Rays and are controlled by V-Ray's DMC Sampler.Ī simplified diagram of raytracing: Primary Rays are sent out from the camera into the scene, intersect with geometry, and send out various Secondary Rays to sample the scene.įrom this point forward, we'll simply refer to 'Rays' as 'Samples' - because that's what the purpose of a Ray is - to take a Sample of a scene to gather information about what's going on in it. Whenever a Primary Ray intersects with geometry in the scene, additional rays get sent out from that point of intersection into the rest of the scene to gather information about things like Lighting, Shadows, Global Illumination (GI), Reflection, Refraction, Sub-surface Scattering (SSS), etc.
These rays originating from the camera are called Primary Rays (sometimes also called Camera Rays or Eye Rays) and are controlled by V-Ray's Image Sampler (Also known as Anti-Aliasing or AA). When a render begins, rays are first sent out from our camera into the scene to gather information about the geometry that will be visible in the final image. If you already know the underlying concepts and just want the technical step-by-step procedure, you can skip right to it. And finally I'll provide a step-by-step procedure to optimize any scene to render with an ideal balance of quality and speed. Then we'll learn how to identify the different sources of noise a scene can have. Then we'll go over an example scene to demonstrate exactly how a render can be optimized to be faster and cleaner.
We'll first cover some of the underlying concepts behind how rendering and V-Ray's sampling works. But with a bit of understanding of how V-Ray works under the hood, you can achieve a higher quality result WITH faster render times - in some extreme cases ranging between 3x faster to 13x faster than the universal settings. Many times you'll see artists adopt the 'Universal V-Ray Settings' of having the Image Sampler (Anti-Aliasing, or AA) Max Subdivs value set very high (like 50 or 100), and then simply lowering the noise threshold value until the render becomes clean enough - thinking that it's the best / fastest that V-Ray can do. There's often a lot of confusion surrounding the topic of V-Ray's sampling and what 'ideal' settings are. This tutorial attempts to cover and clarify the process of optimizing your V-Ray render settings to get the best possible render quality and fastest render time for a given scene.
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