I setup an animation of a product (HDRI+some lights) and now I did a test. But the output isn’t stable and I get a flickering between some frames so that I can’t use it for my client. Is it a known problem and is there a way to avoid this? Or should I send my project file for bug cecking? To the Bongo team or to @nathanletwory ?
after a lot of test I found that Bongo 3 isn’t the reason for problem. Finally I tested a reduced scene with only two objects and Bongo 3 wasn’t loaded. If the spring is in the scene than the output is darker than if the spring is hidden - see my screenshot.
I glad to focus the issue to a simple test scene and hope the bug can be caught now and fixed soon. My client is waiting for the animation. I’m curious what you find.
@Micha with the help of @Joshua_Kennedy I was able to reproduce the change in color. It somehow has to do with the transparency setting. I’ve logged it as RH-63705Environment affects rendering differently when Transparent option is checked in Backdrop.
Here the scene without textures so it is quite small saved. It can’t be seen in raytraced viewport but if you press the render button. It’s a very critical bug for my current project - it’s freezed until the issue is solved.
@nathanletwory I’m not sure you have seen it - the logged bug RH-63705 could be an other issue than the flickering. Could check my last posted file please? A fix is very needed to finish a current project. Without a fix the work on the animation of the last weeks was in vain.
@Micha in a backup copy of your CyclesFlicker2.3dm file could you remove the materials #Gehäuse_silber and Metall_sat and replace them with the materials in the zip FixedMaterials.zip (1.2 MB)
Assign to the objects and see if they work now better. At least here I can no longer reproduce the difference in tint when hiding the spring.
If this works then the problem is somehow related to the IOR setting. In your materials it is 1.0, whereas in my manually recreated materials it is 1.52.
I don’t know yet why this happens, but if this workaround gives you the results you are looking for you should be able to finish your animation without having to wait for a fix. I have currently no idea why the difference happens, so I have no ETA for a fix.
edit: I can’t redo in a file created from scratch, but it still happens in your file
Here from my file created from scratch two renders subtracted
For the recreated file I had originally the HDR Mechanik environment texture in, but that was too big so I swapped it out for a different one. Still no differences between with and without spring though. The materials are the same as from FixedMaterials.zip (1.2 MB)
At my project file there is a complex Bongo animation of several weeks work and I can’t start from scratch.
Is it not strange that the whole exposure is changed? Also I did two tests - I disabled all lights and I disabled the environment. In both cases I got the exposure change, so it seems to be not related to lights or environment only.
I tried a “Reset to default” of the render options but the exposure is still changing. Also it needs ~50s to start a rendering, before it was a few seconds. So, this is not a way. Only a new problem appears.