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I want to create a Auxetic Foam Cell Structure with this technique: Create a sphere in sphere (with boolean diffrence) Generate particles with add particles and replace with mesh sphere in sphere for grid distribution la morphologie est obtenu de cette forme Note: The interference between spheres with holes is equal to the thickness of spheres. enter image description here

But, if i want the distribution of meshes (sphere in sphere) to be random (50 spheres), how can i do that? Ex:

enter image description here

enter image description here

http://pasteall.org/blend/index.php?id=50818

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  • $\begingroup$ Can you show a simple example with Boolean Operators? Are you stating one case is easier and one case is more difficult. Is this for a single image or a dynamic image sequence? $\endgroup$
    – atomicbezierslinger
    Commented Dec 2, 2018 at 17:09
  • $\begingroup$ it's a cube that contains these spheres with holes $\endgroup$
    – saded
    Commented Dec 2, 2018 at 17:25
  • $\begingroup$ We do not understand each other. That happens sometimes. $\endgroup$
    – atomicbezierslinger
    Commented Dec 2, 2018 at 17:29
  • $\begingroup$ it's a bit difficult with me : pasteall.org/blend/index.php?id=50818 $\endgroup$
    – saded
    Commented Dec 2, 2018 at 18:34
  • $\begingroup$ Related (different technique but similar visual result) : blender.stackexchange.com/a/81396/29586 $\endgroup$
    – Rich Sedman
    Commented Dec 3, 2018 at 7:24

2 Answers 2

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version Shader

Probably would be good to know the purpose of your needs. In some cases could be enough and probably looking better simple Volumetric material with texture type Voronoi or Musgrave.

enter image description here

Under Properties > Render > Geometry > Volume Sampling > Step size decrease value to something like 0.0100. In Blender 2.79 are some changes on Volume Shader, I don't know how to colorised foam to get the same result.

enter image description here enter image description here

version Mesh

  • add Cube
  • use addon “Destructability Editor” or official “Cell Fracture” to crack cube into Voronoi shards

enter image description here

  • Join all shards Ctrl+J
  • in edit mode - “Remove Doubles” (W)
  • select all outer faces and choose delete "Edges"
  • than delete “Only Faces”

enter image description here

  • add Modifiers - Smooth (here with Factor 2)

enter image description here

  • Switch to "Edge" select
  • Select "Random" from menu like 20-50% and delete selection

enter image description here

  • Subdivide (W) like 2-4

This created net you can render by adding "Skin" modifier, but its very heavy for calculation, so I used here to add Mball to the scene and add Particle system to the net with "Render" > "Object" > "Mball".

enter image description here enter image description here

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  • $\begingroup$ Good vklidu, as for the first solution, the problem is that I can not take the thickness containers. The second solution is a good solution. Can you add a cross-sectional method to obtain sequential images, which are in two colors (voids and texture yellow)?, $\endgroup$
    – saded
    Commented Dec 4, 2018 at 19:00
  • $\begingroup$ Contact me on blenderartists.org . I didn't understand your comment. It isn't the best place for discussion here :) Thanks $\endgroup$
    – vklidu
    Commented Dec 5, 2018 at 11:02
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Is an approach like this one equivalent to what you describe?

  • Using a Rigid Body simulation with collision, pour a bunch of balls into a box:

enter image description here

Choosing a stable frame at the end of the simulation..

  • CtrlA Apply visual transforms to the balls, and in the Tool Region > Physics, remove them from the simulation.

enter image description here

  • With the pivot set to 'Individual Origins', scale the balls up to your interference margin, apply the scales, and reintroduce the inside surface of the box, flipped, sealed, and scaled.

enter image description here

Using the Bool Tools shipped add-on..

  • Make a union of the balls..
  • and subtract them from the box

enter image description here

The thickness depends on the scaling of the spheres before union..

enter image description here

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  • $\begingroup$ Good idea, but the problem that this technique does not give shape with desirable thickness. There is a script that can generate random spheres, the technique is to create a sphere in sphere, then we replace the spheres generated with the script by this sphere, here we can adjust the thickness of the sphere, but the problem is how to assemble the interference between these spheres after replacement to get the foam. Note: in the script it is necessary that the spheres is interferent with each other with the desired thickness. $\endgroup$
    – saded
    Commented Dec 4, 2018 at 12:50
  • $\begingroup$ @saded (see edit) I'm pretty sure, if your intention in the OP is to subtract the sphere-shells entirely from the cube that encloses them, then this arrangement is the exact equivalent. The physical collision places the sphere-centers at the same relative position as they would have with 1/2 interference/shell thickness, and the scaling makes up the other 1/2? Or do you want the solid to comprise some other constituents? $\endgroup$
    – Robin Betts ♦
    Commented Dec 4, 2018 at 14:38
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    $\begingroup$ @saded ahhhh! do you want the solid formed by the intersection of the shells? $\endgroup$
    – Robin Betts ♦
    Commented Dec 4, 2018 at 15:02
  • $\begingroup$ Yes, It is only the shells that overlap between them, with thickness equal R-r $\endgroup$
    – saded
    Commented Dec 4, 2018 at 15:50

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