Samad Kazemi Khosrowshahi Extruding a 2D form into a 3D object is the most basic method. Extrusion is basically pushing a 2D form into the third dimension by adding depth to the Z-axis. Extrusion produces a 3D shape having width, height, and, now, depth.
I came across your question here, and I’m not quite sure if you are still dealing with that. However, just in case this is still your inquiry, we developed a method for 3D reconstruction of the structure of a packed bed of spherical particles from 2D microtomography images. Here you can find more details about it, and I’m happy to help anyway!
Article A new method for reconstruction of the structure of micro-pa...