This page provides information on the Global DMC rollout under the Sampler tab in V-Ray's Render Settings.
Monte Carlo (MC) sampling is a method for evaluating "blurry" values (anitaliasing, depth of field, indirect illumination, area lights, glossy reflections/refractions, translucency, motion blur, etc). V-Ray uses a variant of Monte Carlo sampling called Deterministic Monte Carlo (DMC).
The difference between pure Monte Carlo sampling and Deterministic Monte Carlo is that the first uses pseudo-random numbers which are different for each and every evaluation (and so re-rendering a single image will always produce slightly different results in the noise), while Deterministic Monte Carlo uses a pre-defined set of samples (possibly optimized to reduce the noise), which allows re-rendering an image to always produce the exact same result. By default, the Deterministic Monte Carlo method used by V-Ray is a modification of Schlick sampling, introduced by Christophe Schlick in [ 1 ] (see the References section below for more information).
Instead of having separate sampling methods for each of the blurry values, V-Ray has a single unified framework that determines how many and which exact samples are to be taken for a particular value, depending on the context in which that value is required. This framework is called the DMC sampler.
||Properties editor|| > Render > Sampler tab > Global DMC rollout
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The results in the render quality and render time are negligibly small. That is why, we highly recommend the default settings that work for a wide variety of scenes. |
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The actual number of samples for any blurry value is determined based on three factors:
More information on deterministic Monte Carlo sampling for computer graphics can be found from the sources listed below.