A method of generating a pre-mesh includes locating a reference voxel, which is inside a surface of an object and is adjacent to a voxel outside the surface of the object. The method also includes determining a set of contributing voxels by finding adjacent voxels on a same surface as the reference voxel using voxel morph operators, averaging centers of each of the contributing voxels and the reference voxel, and using the average of the centers as a new center of the reference voxel.