Make ANYTHING porous in Blender 

Glad it was helpful!

My pleasure!

No problem 😊

If you want to apply the Boolean operation after the volume cube, you’d need the operation to apply on the Volume Cube output (ie geometry), rather than a density field input. For this, you can’t use Boolean Math AND. Instead, you’d need to convert Volume to Mesh and then use a Mesh Boolean. But this is somewhat heavier to run

That’s, odd…when you say it doesn’t work for cubes, how so?

@@ryomizutagraphics can youtube comments include screenshots? :) When I rotate the cube in edit mode, my porous volume becomes some kind of truncated parallelogram-prism (as opposed to just remaining as a cube). I assumed that I made a mistake in my node setup, but then when the same nodes gave perfect results for Suzanne and other objects I couldn't explain what was happening. I haven't investigated in depth, but I'd be curious if anyone else runs into the same issue. (maybe there's some edge case when the r-vector and normal vector are identical or something like that).

@@ryomizutagraphics I just played around with this a bit more and realized the problem occurs when there the density of faces is small. So, I get strange results for a cube, but if I subdivide the surface of the cube several times (and sometimes I need to slightly bevel the edges too) then everything looks right. So, not 100% sure what is going on but I suspect something with the way surface normals are calculated.

Yep, I agree - I’ve also found that this doesn’t work well for cylinders. Something about faces that are orthogonal to each other seems to complicate something…

Sounds like you might have forgotten to apply scale to your coin

@@ryomizutagraphics Thanks for the quick response! I have applied scale to my object, it doesn't make a difference. The particles are still narrow. When I scale the width of my coin object the particles become 'equal' in dimensions (sphere/cube), which is what I want! So how could I change the particles without changing the shape of the coin? Can I apply a certrain node for this?

Ok, in which case, add a Position node, connect it to a Vector Math node, and connect that into the input Vector socket of whatever texture you’re using to create the porosity. Set the Vector Math to multiply and set the multiply values so as to stretch/compress your position coordinates as needed to fix your scaling

@@ryomizutagraphics This does affect the width of the particles in a certain way, but more like a 'stretch'. It extrudes them kinda, rather than turning the particles into a sphere/cube as it does with object scaling. Could this have to do with the Volume Cube? Like I said before when I scale the width of my coin object the particles become spherical. And when I scale them even further beyond that they stretch out. It looks like the sweet spot for the particles is when my object has a 'cube like' dimension.

Might be faster if I check your blend file. Do you want to just email me what you have + a sketch of what exactly you want to get? My email is ryomizutagraphics@gmail.com

Oh dear! What geometry are you using?