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Can you help me how can draw these geometries with add mesh Math Function (XYZ Math Surface) for this equation : (cos(x) + cos(y) + cos(z) = t) enter image description here

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I can't help with mesh creation but you may like to use volume shader for visualisation.

Notice that the cube has a size of 10 units, and a scale of 1.
Cycles will give more precise results but you can use EEVEE too.
In cycles (orthographic view): schwartz volume shader In EEVEE (perspective view): schwartz eevee

I used an emission shader but you can use simple volume shader with some external light.

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    $\begingroup$ For the node technique, it's good to generate complex shapes but for me I want to export the mesh to the STL file, is there a way to do this with the nodes? $\endgroup$
    – saded
    Commented Aug 27, 2020 at 6:46
  • $\begingroup$ I'm not sure, but you can try this or another $\endgroup$
    – Bithur
    Commented Aug 27, 2020 at 7:11
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    $\begingroup$ @saded There is an addon you can try : Sverchok $\endgroup$
    – Bithur
    Commented Aug 27, 2020 at 17:59
  • $\begingroup$ sverchok is a good addition for nodes but is it possible to export the generated node to the mesh? $\endgroup$
    – saded
    Commented Aug 28, 2020 at 19:16
  • $\begingroup$ AFAIK no. I've seen some sort of converters voxel-to-mesh (for houdini) but I never tried it. $\endgroup$
    – Bithur
    Commented Aug 28, 2020 at 19:44

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