I wouldnt know where else to ask. I am currently experimenting alittle with Mandelbulb3D. There is one issue i cant solve which are black pixels in the images no matter how high i render it resolutionwise. This is part of a 4k render. Anyone knows how to get rid of those black pixels ? They ruin almost every image created with that software 
I’ve used it before, very cool software, but can also be intense on hardware
- the last update was 4/2020
so the first place i’d troubleshoot is any new technologies that were added to your video card since that date that mandebulb may not be compatible with - you could probably do a permanent fix in the video card profiles to disable x features when using the mandebulb program.
The rays might be overstepping the boundaries of the fractal. Try lowering the Raystep size.
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I ended up in the ray settings but no matter what i try i cant get rid of those dots. I notice a change when using different settings, but they are always there. One way i could think of was to render a 8 oder 16k image and scale that down. But that would take beetween 5 and 20 hours to render … just for a test …
What are your settings? I’m pretty sure it’s a problem in your settings.
I think rendering in 4k or higher is total overkill. I would rather render a picture at a sub HD resolution and scale it up afterwards with Gigapixel or a similar app. With a video upscaler like VideoAI you can also interpolate the frames to make the video smoother, in case you want to render a video.
With this you can save nearly 94% render time by upscaling the image 4x (saves 75%render time per image) and interpolating the frames 4x (will save additional 75%).
There are also free alternatives in case you don’t want to buy Topaz software.
I changed all the corresponding ray values up and down , used different combinations, but like said with only a little change. Scaling is out of question because i need that sharpness on the egdes. I need to render at 4k minimum. because i make a mesh from it and want to zoom in. you can imagine when making a terrain for example how difficult that is sharpness weise.
BTW those pixels do not appear on evrery fratcal type , perhaps its part of the formular itself ?
EDIT:
I just rendered a few other formulas in “high” calculation mode, it appears that those dots only depend on the formula…