Generating polygon meshes approximating surfaces with sub-cell features

A system comprising:

• at least one processor;
• and
• a memory coupled to the at least one processor, with software instructions stored thereon that, when executed by the at least one processor, cause the at least one processor to perform operations including:
• obtaining a signed distance field (SDF) grid that includes a plurality of cells, wherein the cells of the SDF grid include cell values that indicate distances of the cells to a surface that the SDF grid encompasses, the surface distinguishing an inside and an outside of an object;
• determining a boundary mesh having boundary vertices and boundary faces of particular cells in the SDF grid that are based at least on cells that are within a threshold distance of the surface;
• determining offset cell positions for centers of neighboring cells that neighbor the boundary mesh, wherein the offset cell positions are based on corner gradients of the neighboring cells;
• and
• generating an adjusted mesh that approximates the surface, wherein the adjusted mesh is defined by mesh vertices that are based on the boundary vertices of the boundary mesh that are displaced based on the offset cell positions.

A non-transitory computer-readable medium with instructions stored thereon that, when executed by a processor, cause the processor to perform operations comprising:

• obtaining a signed distance field (SDF) grid that includes a plurality of cells, wherein the cells of the SDF grid include cell values that indicate distances of the cells to a surface that the SDF grid encompasses, the surface distinguishing an inside and an outside of an object;
• determining a boundary mesh having boundary vertices and boundary faces of particular cells in the SDF grid that are based at least on cells that are within a threshold distance of the surface;
• determining offset cell positions for centers of neighboring cells that neighbor the boundary mesh, wherein the offset cell positions are based on corner gradients of the neighboring cells;
• and
• generating an adjusted mesh that approximates the surface, wherein the adjusted mesh is defined by mesh vertices that are based on the boundary vertices of the boundary mesh that are displaced based on the offset cell positions.