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enter image description here

I want it to be seen completely as a particle, but there's even a white mesh. How to get rid of that white wave from the setup? enter image description here

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  • $\begingroup$ I don't know why you accepted the answer since this could not be the solution. Your question is lacking a lot of information - is that white "wave" the initial Flow object or is it the resulting fluid mesh of the domain? For the latter, see my answer. For the Flow object: just disable visibility in render and/or viewport if you don't want to see it. $\endgroup$
    – Gordon Brinkmann
    Oct 2 at 9:38

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A fluid simulation is supposed to be creating a fluid mesh which can be rendered afterwards - this will be showing in renders using the material which is on the domain object. And if there is no material, it will show the default (almost) white surface.

If you do not want to display the fluid mesh (to show particles like in your example) you could disable Mesh in the domain settings - but then the complete bounding box of the domain will be shown with whatever material you put on it. But disabling it will save you simulation time if you really do not need the mesh.

So to get rid of the domain in render, you have to give it a material with a simple Transparent BSDF set to fully white, which makes it completely invisible for the camera.

Fluid domain with Mesh enabled and no (or default) material:

domain with mesh

Fluid domain with Mesh disabled (no matter if it was simulated or not) shows domain's bounding box in render:

domain bounding box

Fluid domain with a completely transparent (= invisible) material - no matter if Mesh is enabled or disabled:

transparent domain

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  • $\begingroup$ Oh, it must have been checked by mistake As you said, I disabled the mesh and pressed bake and it worked! There was a misunderstanding because I am not good at English, but thank you so much $\endgroup$
    – beepbu
    Oct 2 at 14:02
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I think you just untick this mesh box in the domain if I am reading this correctly.

This box is in the domain, you can search for 'mesh' to help find it.

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  • $\begingroup$ Actually when you disable Mesh in the domain, the domain will be rendered as its complete bounding box which surely is not desired here. I do not know why this is the accepted answer though... even my answer will not help as I just realized, because I think what is rendered white there in the question is the Flow object which initiated the fluid, not the domain/fluid mesh... $\endgroup$
    – Gordon Brinkmann
    Oct 2 at 9:35

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