Method and device for converting three-dimensional model into building block style model

The embodiment of the invention provides a method and device for converting a three-dimensional model into a building block style model. A specific embodiment of the method comprises the steps of obtaining a signed distance field of a three-dimensional model, wherein a first resolution of the signed distance field is determined based on a second resolution of a building block style model; generating a building block unit based on the second resolution; according to the value and the coordinate of each voxel in the signed distance field, determining vertex positions of a plurality of target building block units used for forming a building block style model; determining N target colors according to the chartlet color of the three-dimensional model, and determining a first corresponding relationship between each triangular patch in the three-dimensional model and the N target colors; according to the first corresponding relation and the distance between each target building block unit and a triangular patch in t