Rendering Question

Drogo Nazhur

Why do some images look good after 100 iterations and letting the render run to 400 does very little to improve the quality while other images need to run to 400 iterations and beyond and are still lacking in quality?

kenshaw011267

1) Lighting could be different in the two scenes. More light equals faster renders.

2) One scene could be indorrs and the other outside. Indoor scenes have lots of surfaces to bounce light off of which means slower renders.

3) Releated to the other two, shadows with no light reaching them directly take a long time to resolve as they rely on reflected light to converge the pixels.

Drip

Depends on a lot of stuff. Do you use a lot of props within the scene, or only a HDRI? How many characters are on the scene? What are your characters wearing, including their hair? How many lights are on the scene, and what sort of lights are they? How big are the textures you use for just about everything? Reflections and (partial) transparencies? What are the dimensions of the renders?

Basically, *everything* affects your rendertime. And over 10,0000 itterations isn't exceptional for the slightly more complex renders that have a lot of props and mesh lights and stuff when they get rendered to a 4k canvas.

fred9803

Don't forget the stuff in your scene. A added a bicycle to a scene that had taken previously 20mins to render, and to get to the same itterations to took nearly 90 minutes. I have no idea except there's something going on with the bike textures/shaders.

nonesuch00

Number of surfaces with reflections, refraction, translucency/opacity, number of lights, and lighting levels