Hi I should make a video for a project of a hydroponic containers but the rendering time is over 30 hours ... how can I reduce it while maintaining good graphics ? Thanks !
As a first you need to know what is your priority: time or quality? You can't have both.
This is very complex "problem" and need a lot of study. What is good in one situation may not be good in another. Generally:
- set Clamp to higher value
- use "Branched Path Tracing" - check noise in every pass in compositor and adjust Samples by render pass.
In "Light Paths":
- turn off caustic.
- reduce light bounces.
- set Tilles according to your hardware (usually 64x64 for CPU, 256x256 for GPU).
- tick "Persistent images" if your textures does not change in full length of animation
- try using "Spatial Splits".
In Material node editor: Use "Light path" for determine rays you don't need. For example disable shadow ray in glass can speed up render quite a lot.
I mentioned only most used features. There is not a general "golden rule" that work always and in every case. All settings depend of your scene and your preferences.
BTW: render animation about 30 hours is not unusual.
I found that setting the render style under Render -> Performance -> Tiles to Left to Right instead of Center cut my render time to 25 mins a frame, whereas before i was getting about 45-50 mins a frame for animation. I was also rendering at 720 by 1920 pixels, mainly because i was doing an animation test with only one character in frame at a time.
EDIT: Duarte Farrajota Ramos pointed out that only changing one setting shouldn't have such a large affect on the render time. When i looked through my settings and files that i had before and after the decreased amount of time, i realized that i had rendered still images of the animation before the final animated version was rendered, and had Persistant Images enabled.