Slow rendering is a problem that many people will encounter. If your 3D model, lighting, and materials have been modified to the simplest but cannot improve the rendering speed, then you should consider whether the settings of the renderer are not perfect enough.
The speed of the Vray renderer is related to the three settings of anti-aliasing, global light engine, and QMC sampler .
Global light engine
The Vray renderer provides a total of 4 different global light engines for 3DMAX production: photon map, luminescence map, quasi-Monte Carlo algorithm, and light buffer. 4 different types can be used in the first bounce and the second bounce. .
1. In the production of indoor commercial renderings, the use of luminous maps and light buffering methods for calculation is the best choice to achieve a balance between rendering time and image quality.
2. In the second bounce option, the value of the multiplier determines the effect of the second diffuse bounce in the scene lighting. Increasing this value can make the rendered image brighter and also increase the rendering time
3. In the first bounce, the value of the multiplier determines the effect of the first diffuse bounce in the scene lighting. Increasing this value can make the rendered image brighter and also increase the rendering time.
Anti-aliasing
The Vray renderer provides us with 3 different anti-aliasing methods for image samplers. The concept of “anti-aliasing sampling” refers to an algorithm for sampling and filtering, and generates the final pixel group to complete the image rendering.
1. Fixed image sampler: For texture map scenes with a large number of blurry special effects or high details, using it is the best choice for both image quality and rendering time.
2. Adaptive subdivided image sampler: This is the best choice for scenes where there is no Vray blur effect and direct GI, depth of field, motion blur, etc.
3. Adaptive quasi-Monte Carlo image sampler: This sampler is very good when a scene has high-detail texture maps or a lot of geometric details but only a few blur effects.
QMC sampler
QMC is a “quasi Monte Carlo” sampler. It can be said that it is like the brain of the Vray renderer. Throughout every “blur” evaluation of Vray, QMC sampling is generally used to determine what kind of samples and which samples are ray traced.
