I did not know some of this myself until I had a chance to ask this weekend! The important settings are: Click to expand Max Samples: Short version: The Max Samples count is the maximum number of samples Iray will achieve before it stops the render. The default number is
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I did not know some of this myself until I had a chance to ask this weekend! The important settings are: Click to expand Max Samples: Short version: The Max Samples count is the maximum number of samples Iray will achieve before it stops the render. The default number is How long it takes to get to samples varies by what kind of hardware your computer has - it will get to much faster on an Nvidia graphics card than a CPU or an AMD card.
Longer version, as best I was able to learn from web research: In any kind of rendering, the engine is trying to depict a 3D image as though it were in real space; in real space your eye views all images as continuous, but in the rendered image, the image has to be broken up into a finite number of pixels.
The process of sampling is how a render engine tries to compensate for working with those pixels and the fact that visual information "stops" between them, creating the visual artifacts that you probably associate with a "bad" Iray render.
But importantly for now, the more samples Iray calculates, the more it can smooth out the 3D space between the pixels into a continuous image without "jaggies" or "fireflies. Max Time secs : Iray can also be told to stop the render when a certain number of seconds have passed. The default value is , which is two hours.
Important take-away: Iray will quit when it gets to ONE of these two values, normally. If it gets to two hours but has only done iterations or samples, it will still quit.
If you have older or lesser hardware, you need to set the time much higher to get the same samples. If you want render time to go just based on those, turn this to OFF. Rendering Quality: This linearly increases render time each time you raise the number: 2 is double the value of 1, 3 is triple the value of 1, etc.
It overrides the time and samples counts. Use this only if you really want to try the "render forever and tell it to stop when I like how it looks" method. Otherwise just leave it at 1. Rendering Converged Ratio: This is a function of the time and samples counts. You must be registered to see the links.
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