How does Iray works?

nopror

I do not quite understand how Iray works, in particular, the connection between complexity of the scene and number of samples.
As I understand it, Iray shells objects with samples getting the result. More samples - longer render.
I worked with a 3D scanner, There is the same principle: more rays - longer scan, but more accurate result.

Suppose. I have a small cube on the stage and 15,000 samples. Does this mean that Iray will render it as much as a complex scene, until the entire rays/samples is fired. Does this mean that Iray will render it as much as a complex scene, until the entire sample ammunition is fired?
Although, in this case, the samples fly away into the empty space, where there is nothing to calculate, then the speed of fire increases.

Specialists in the render, explain, please, how it works.

fastbike1

Not samples but iterations. Iray is a simulation of the physical behavior of light. It will iterate the algoriyhms until it meets one of the completion criteria (e.g. time, iterations, convergnece).

Their is significantly more information on Nvidia's website.

outrider42

If you are talking about the maximum iteration count in the Iray settings, that is only the cap for how many iterations it can run. There are many, many factors that determine how many iterations Iray will run when you render. The obvious one being the complexity and size of the scene created. Other factors include the shaders used, again more complex shaders may take longer. The number of times light bounces around can factor as well. A hallway of mirrors might take a while. Dark scenes always seem to cause Iray problems, and can take tons of iterations to calculate.

The last factor is you. You can always decide to end a render before Iray decides it is finished. You can watch the scene render and judge when it looks good enough for you. You can always take the image and do post work to clean it up if it is taking too long to render. Its all up to you.

nicstt

The mark-one eyeball is the best method of deciding if the render is done. If you like it, stop it.