Processing 3D objects

A method of processing a 3D object, comprising:

• receiving a 3D object model representing an object to be processed;
• computing geometric and material property object attributes of the object;
• wherein computing a geometric object attribute comprises normalizing an alignment of the object through:
• orienting the object on a 3D coordinate system;
• computing a center of mass of the object;
• translating the object such that the center of mass is placed at a coordinate of the 3D coordinate system;
• rotating the object about the coordinate such that a shortest dimension of the object is aligned with a first axis of the 3D coordinate system;
• rotating the object about the first axis such that a longest dimension of the object is aligned with a second axis of the 3D coordinate system;
• and,
• computing a minimum bounding box for the object;
• and,
• wherein computing material property object attributes comprises:
• slicing the object into layers perpendicular to the first axis with a resolution of a voxel;
• dividing each layer into voxels;
• computing bounding boxes for each layer of the object;
• and,
• computing values of attributes for the whole object, for each layer of the object, and for each voxel;
• comparing the object attributes with stored object attributes;
• and,
• retrieving a previous print recipe associated with stored object attributes that match the object attributes.