Voxelizer.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Voxelizer : MonoBehaviour {
	public int xSlices = 5;
	public int ySlices = 5;
	public int zSlices = 5;
	public GameObject Cube;

	void Start () {
		Voxelize ();
		print ("Done");
	}

	// fill a cube with many many small cubes
	void Voxelize() {
		var mesh = Cube.GetComponent<MeshRenderer> ();
		var newCube = new GameObject ();
		newCube.transform.position = Cube.transform.position;
		newCube.transform.rotation = Cube.transform.rotation;
		newCube.transform.localScale = Cube.transform.localScale;

		for (var i = 0; i < xSlices; ++i) {
			for (var j = 0; j < ySlices; ++j) {
				for (var k = 0; k < zSlices; ++k) {
					var smallCube = Instantiate(Cube, newCube.transform);

					var x = Cube.transform.position.x;
					var y = Cube.transform.position.y;
					var z = Cube.transform.position.z;

					var sliceSizeX = 2 * mesh.bounds.extents.x / xSlices + Mathf.Epsilon;
					x = x - mesh.bounds.extents.x + sliceSizeX / 2 + i * sliceSizeX;

					var sliceSizeY = 2 * mesh.bounds.extents.y / ySlices + Mathf.Epsilon;
					y = y - mesh.bounds.extents.y + sliceSizeY / 2 + j * sliceSizeY;

					var sliceSizeZ = 2 * mesh.bounds.extents.z / zSlices + Mathf.Epsilon;
					z = z - mesh.bounds.extents.z + sliceSizeZ / 2 + k * sliceSizeZ;

					smallCube.transform.position = new Vector3(x, y, z);
					smallCube.transform.localScale = new Vector3(1.0f/xSlices, 1.0f/ySlices, 1.0f/zSlices);
					smallCube.transform.localRotation = Quaternion.identity;
				}
			}
		}

		Cube.SetActive (false);
	}
}