Scene performance optimisation

[cybernoid]

Hello,

I think it would be great in the manual but also as a continuing sticky thread in the forum if there were a list of collated tips regarding optimising rendering speeds. As I think there is a lot of knowledge in that regard which isn't explicit or obvious enough.

For example from what I understand these things are important:

1) Daylight is the fastest type of lighting, HDRI Environments are faster than lights, lights are faster then objects with emissive materials
2) Indoor scenes are slower, the use of portal materials can help this
3) Don't set extremely high values for specular or diffuse material properties - use light intensities, camera exposure or post processing instead
4) Don't set roughness for materials too close to zero
5) Use different material IDs in preference to mix materials with masks

[abstractmedia]

6) Don't render with 'All' animation Mode. If possible render in Movable Proxy or Camera Only.
7) Delete all unused materials.
8) (Obviously) delete anything that will not be on camera.

[Stahlwolle]

Hey guys!

i saw this post and now i wonder if i missed to undertstand something:
in the post it was said: lights are faster than emissive materials (?!)

i tought octane-standalone lights are always emissive materials / geometry - is there a way to use real light sources or any other light source than blackbody / texture emission / HDRI or the implemented daylight system?!

[andw]

9) Setting Opacity value to other than 1 for diffuse materials (or using transparency maps) dramatically reduce rendering speed.