knifecut a grid of squares into a belnder object with bisect plane

grid_bisect_object.py

import bpy
import bmesh
import math
def diceObj(obj, intSize = 0.5):
    arrDimensions = obj.dimensions
    # add one for both ends of a row because we want to start from the center
    intRowsX = math.floor((arrDimensions[0]/intSize) + 1)
    intRowsY = math.floor((arrDimensions[1]/intSize) + 1)
    bm = bmesh.new()
    bm.from_mesh(obj.data)
    
    # hold allt he planes to bisect with as (location), (normal)
    arrPlanes=[]
    for i in range(intRowsX):
        intLocation = intSize*i
        arrNormal = (1,0,0)
        arrPlaneLocation = (intLocation,0,0)
        arrPlanes.append([arrPlaneLocation, arrNormal])
        arrPlaneLocation = (-intLocation,0,0)
        arrPlanes.append([arrPlaneLocation, arrNormal])
    for i in range(intRowsY):
        intLocation = intSize*i
        arrNormal = (0,1,0)
        arrPlaneLocation = (0,intLocation,0)
        arrPlanes.append([arrPlaneLocation, arrNormal])
        arrPlaneLocation = (0,-intLocation,0)
        arrPlanes.append([arrPlaneLocation, arrNormal])
    print(arrPlanes)
    for plane in arrPlanes:
        geo=list(bm.verts) + list(bm.edges) + list(bm.faces)
        bmesh.ops.bisect_plane(
        bm,
        geom=geo,
        dist=0,
        plane_co=plane[0],
        plane_no=plane[1],
        clear_inner=False,
        clear_outer=False)
    bm.to_mesh(obj.data)
    obj.data.update()
    bm.free()
    
obj = bpy.context.active_object
diceObj(obj,0.25)