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The Fresnel Effect was first documented by the French physicist Augustin-Jean Fresnel (1788-1827). Fresnel is a good approximation and is as close to physically correct materials as you can get whilst keeping the rendering times low. If you position yourself to the side of the monitor and look into the glass you will clearly see a reflection of the environment, but if you position yourself directly in front you will notice that the reflection is reduced. A good example of this would be to look at an old CRT monitor, where the viewing panel is glass. Most materials except metals have a Fresnel reflection, making the reflection strong at glancing angles but weak at more front on angles. White reflects the entire visible colour spectrum whereas black absorbs all colour.
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White RGB (255,255,255) is fully reflective and black RGB (0,0,0) is not reflective at all. Like diffuse it uses a colour value to determine the reflection strength. The light rays are bouncing all over the place, and not being absorbed.Ĭan be used to simulate dust on a surface by controlling the way the surface reflects direct light.
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If you render an object that is pure white or pure black you will notice that there is no contrast. When creating a white or black material, set the colour values to an off white RGB (245,245,245) / black RGB (2,2,2). It is important to understand that no material in the real world is pure white RGB (25,255,255) nor pure black RGB (0,0,0). This is the actual colour of the surface, reflection and refraction colours can affect the visual appearance of this colour. These are the main parameters controlling the quality vs render time ratio.A more in depth look at each setting within a Vray material for version Vray 2.0. Balance between quality and render time is achieved with the Max. V-Ray comes with two types of image samplers: Progressive and Bucket. V-Ray continues working until either the maximum number of calculations is reached or, when the Progressive image sampler is used, when the time limit is reached (whichever comes first). Render quality and time are conditioned by the amount of calculations per pixel done and if these calculations are limited in time. The sections below explain which parameter to tweak and how. If the default Render Settings do not give the desired result, you can adjust them to fit your needs. They serve as a balanced starting point for a variety of computer graphics productions. The results of these tests are the basis for the optimized setup selected as the engine default. To determine the best compromise for image quality and render time, Chaos Group engineers have measured the performance of V-Ray on thousands of scenes. It’s important to know that they are correlated - high image quality comes at the expense of long render times, and vice versa - speedy renderings produce low image quality. Render production is affected mostly by two factors - image quality and render time.
FAST VRAY SETTINGS HOW TO