# Hekp -- Intersection

Dear Blender friends,
I am new in this software. In my science research project, I need to make a 3D model then print it, so I learned Blender two dates ago. The model is very “simple” described below, but I do not know how to make it:
The model is a sphere made of 2mm cubic lattices, the size of the lattice bar is 1mm, so this model has 1mm cubic holes uniformly in 3 dimensions, the radius of the sphere is 6cm, 5cm, 4cm, 3cm and 2cm, respectively. What I did is the following:
I made 7cmX7cmX7cm 3D lattice mesh with 1mm square bars, then tried to use a sphere to intersect this 3D mesh, i.e, to cut it into a sphere, the program does not allow me to do it. I really need your help to solve this problem. If some one can show me how to do it, I really appreciate it.

Thanks.

Peter

you would probably get a better response if you could supply a reference picture and or what you have attempted so far it’s hard to visualise what you have typed, welcome to the forum!

"you would probably get a better response if you could supply a reference picture and or what you have attempted so far it’s hard to visualise what you have typed, welcome to the forum! "

Thank you for your advice. Please see the image which is the cubic shape, but I want it to be a sphere, I am not sure if I can insert the blender file, so you guys can work on it. Thank you for your help.

Did you use the modifiers function “Subdivision Surface”?!
It could work, but i dont know what hapen to your “smaler” cutted blocks in the block. They could also get “round” with it.

I’m not sure that is mathematically possible is it?, ignore the fact that I haven’t got the lattices square and the holes smaller at the moment in the example below, that’s achievable, if you essentially turn what you have there into a sphere as you can see you can keep it all squares but you get some deformation and the holes are not exactly spaced.

Now I haven’t spent ages trying to prove you can’t do it but I’m working on the premise that if you could get evenly spaced quads around a sphere then that would most definitely be a default setting for polyspheres as it would be very useful and someone would have done it by now

Is this close to what you are looking for if we made the connectors square and the size a bit more uniform ? or was it something else. Do you have a reference image for what you want it to look like in the end ?

Also don’t forget that blender is not a CAD package and although you can be accurate, when it comes to spheres etc depending on how you approach it it will be more of an estimation or what looks good which may or may not be good enough for what you want to do.

Dear Gniiial and Umii, thank you for your replies. The subdivision will not work, because the program does not allow the intersection on the cubic object by the sphere, even if it works, but I need the stuff of the cubic object which is inside of the sphere, not the outside of the sphere. What I created is the following: I used a 1mm x 1mm x 7 cm square bar to make a row of parallel bars, then duplicated this row, rotated 90 degree to make a 2D mesh, then, made 3D cubic from this 2D mesh by stacking the 2D mesh in the 3[SUP]rd[/SUP] dimension and with stacking the rotated row of the parallel bars in 3rd dimension, the final cubic object has cubic lattice structure inside
, not just on the surface. My original thinking is that I could use a sphere to intersect (i.e., cut the cubic object) this cubic structure, remove the structure of the cubic object which is located outside of the sphere and keep the structure inside the sphere, but I do not know how to do it. You can image that what I want is a “sponge” ball with uniform cubic holes in 3 dimensions. This is an idea model for my research. I really appreciate your help.

If use a plane to cut the sphere object in either x, y or z axis, the cross section should look like

.