Noisy / Blotchy GI in interior animation - how to solve?

[mx63]

I Love Lavina!

Exteriors with sun look fine in animation
however, am having trouble with interiors. getting too much noise and those 'blotchy GI' look

I used 1280 x720 for frame size, with 400 samples for rendering.
clamp secondary rays was set to 100, denoiser set to 75%

https://www.youtube.com/watch?v=Ji2snKCcRQg

any advise?

[npg]

Hi,

First of all, for "offline" rendering it would be best to set a noise threshold in the Render side panel (e.g. 0.01) which will make later sampling passes much faster as many pixels wouldn't need sampling. This should allow you to set a higher sample limit (e.g. thousands) for the same amount of render time.

The flickering is most likely caused by the checkerboarded real-time denoising in Lavina. If you don't have refractive objects in the scene (glass) you could disable refractions and this flickering should go away, unless it's caused by something else. However it seems you do have glass near the stairs. In this case you could try simply disabling the denoiser (slider at 0) and using thousands of samples per frame together with a noise threshold. There may be some fireflies in this case though.

[vladimir.nedev]

If you could send us the scene, it will be very helpful.

There is a always the possibility that a bug in the shading code is causing fireflies.

Or maybe you have lots of lights, which can also increase the general noise level, since with the light tree we can sample only one of those lights per AA sample.

Greetings,
Vladimir Nedev

[mx63]

Thanks Vladimir for replying

unfortunately the file is something I cant release.but you are right , it has many lights.

This is a render done with 2500 samples, 2ndary rays clamped to 20. noise threshold set to 0.005 and no denoiser

https://youtu.be/HfngYHz6a-g

much cleaner