BEFORE THIS post WAS IN COMPOSITOR COLUMN BUT I THINK HERE IS BETTER PLACE FOR IT. SO COPIED THIS:
I have horrible flickering noise during my animation and it flickers like a sparks. What causes this noice is method of reducing it by using Z and normal passes combined with bilaterural blur (advised by Barteck Skorupa). But i still wanna use it since it still better and only way to properly reduce other types of noice presented in my scene. So this noice looks like SQUARE PIXELS which are flickering during animation. Which node you recomend to drop after bilatural or somewhere else to reduce it? Change of iterations of bilatural blur helps a bit but not completely and not on all frames.
Ok guys its bugs me and this is only thing that prevents me from rendering this animation. What is that? I will give you more info now about this strange things and it will help you to identify what it is. Its kind of noise but very weird -
1- At most frames there is no such noise (because i removed it by using bilateral blur and determinator) but at other frames they are still appear and not despeckle not bilatural blur helps and the weird thing - THEY BECOME MORE VISIBLE AT HIGHER SAMPLES!!!
2 - At some frames this squares are transparent at others - semitransparent or completly white like you can see on the screenshot
3 - If i render same image at small samples - like 125 for example - i may not see them at all. But if i change to 150 - they become very visible!!!. So maybe its a render bug?
4 - They mostly appear around grids holes models or grids holes alpha images.
5- Even if camera not moving they may still appear and look at different frames - differently (white or semitransparent )
HERE YOU CAN SEE ONE OF THE SQUARES (on this particular frame ITS NOT SEMITRANSPARENT BUT FULLY WHITE -
Here is one more image because at this frame this squares look semitransparent -