Mesh:getDrawRange
Gets the range of vertices used when drawing the Mesh.
min, max = Mesh:getDrawRange()
min number The index of the first vertex used when drawing, or the index of the first value in the vertex map used if one is set for this Mesh.
max number The index of the last vertex used when drawing, or the index of the last value in the vertex map used if one is set for this Mesh.