Why does EEVEE cause motion blurring?

I did not know what topic to place this in, so I chose Support - Lighting and Rendering.

Anyway, I noticed when I have my render engine set to EEVEE, there is some sort of grainy motion blurring when playing animations or viewing materials (most noticeable on shadows, refractions and reflections, etc). This is infinitely worse in Cycles, but when I switch it to Workbench, the blurring goes away. Is this shader processing, I wonder?

Are there more render engines planned? I remember there being the option to “compute device”, what does that do?

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Try to disable viewport denoising.

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Eevee doesn’t have viewport denoising. This sounds like a GPU issue, as Eevee doesn’t have any noise whatsoever

It has it’s own denoiser built in:
image

it does make a motion blur/smeary effect that I find more distasteful than the slight static of undersampling noisy things, like the AO:

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Thats what I meant. Nothings wrong with my iMac’s GPU! As in AO, or something else like denoising! It produces the blurring effect when playing animations.

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Eevee is still doing some random sampling like cycles, just in a way that requires less samples. when you are playing an animation, it doesn’t have enough time to sample the image fully, which is why they have the viewport denoising. it is a temporal denoiser, so it uses samples from previous frames, distorted by any movement in the shot. This is why it looks blurry.

Disable viewport denoising and it might look static-y, but it will be less blurry.

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In upbge fork we have samples per frame, it can reduce this quite a bit.

up the max samples and the samples per frame to the same value

UPDATE: On Blender 4.3.2 LTS (Apple Silicon).

The noise/smear on the shadows I somehow cannot get rid of without turning off shadows is driving me crazy.

How do I disable this noise in Blender 4.3.2 LTS?!

Its also on Raytraced Reflections.

Found it for Raytraced Reflections!

You just set Render method to Blended!