CadQuery OCC Hash Testing

cq_occ_hash_testing.py

import cadquery as cq
from OCP.BRepPrimAPI import (
    BRepPrimAPI_MakePrism,
)

from OCP.BRepAlgoAPI import (
    BRepAlgoAPI_Common,
    BRepAlgoAPI_Fuse,
    BRepAlgoAPI_Cut,
    BRepAlgoAPI_BooleanOperation,
)
from OCP.TopTools import TopTools_IndexedDataMapOfShapeListOfShape, TopTools_ListOfShape
from OCP.TopExp import TopExp_Explorer  # Toplogy explorer

base = cq.Workplane("XY").box(80, 60, 10)
to_cut_out = base.faces(">Z").workplane().circle(10).extrude(-5,combine=False)

print(40*"#"+"\n")#run separator

HASH_UPPER_BOUND = 2147483647
def dump_occ_obj(occ_obj, name="something"):
    r = []
    r.append("Dumping: " + name)
    o = cq.Shape.cast(occ_obj)
    r.append("Vertices::")
    for v in o.Vertices():
       r.append("\t" + str(v.wrapped.HashCode(HASH_UPPER_BOUND)))

    r.append("Edges::")       
    for e in o.Edges():
       r.append("\t" + str(e.wrapped.HashCode(HASH_UPPER_BOUND)))

    r.append("Faces::")       
    for f in o.Faces():
        r.append("\t" + str(f.wrapped.HashCode(HASH_UPPER_BOUND)))
    print("\n".join(r))    


def occ_native_cut(to_cut_from, to_cut):
    def list_of_one_shape(s):
        rv = TopTools_ListOfShape()
        rv.Append(s)
        return rv    
    cut_op = BRepAlgoAPI_Cut()
    cut_op.SetArguments( list_of_one_shape(to_cut_from))
    cut_op.SetTools( list_of_one_shape(to_cut))
    cut_op.Build()
    return cut_op.Shape()
    

occ_base = base.val().wrapped
occ_plug = to_cut_out.val().wrapped

occ_cut_result = occ_native_cut(occ_base,occ_plug)

show_object(occ_cut_result,options={"color":(255,0,255)})
show_object(base,options={"color":(0,255,0)})
show_object(to_cut_out, options={"color":(255,0,0)})

dump_occ_obj(occ_base, name="original")
dump_occ_obj(occ_plug, name="plug")
dump_occ_obj(occ_cut_result, name="cut result")


'''
Example Output
########################################

Dumping: original
Vertices::
        424920253
        424920861
        424929037
        424921613
        424925485
        424920525
        424920813
        424927837
Edges::
        406179373
        406177581
        406074029
        406076973
        406177837
        406075949
        406072493
        406176813
        406073773
        406075565
        406076205
        406179757
Faces::
        407557965
        407556493
        407453677
        407555661
        407554541
        407556701
Dumping: plug
Vertices::
        1944709900
        1944711180
Edges::
        21368556
        21365484
        21365228
Faces::
        21102124
        21101996
        21103244
Dumping: cut result
Vertices::
        424920253
        424920861
        424929037
        424921613
        424920525
        424925485
        424920813
        1944709900
        424927837
        1944711180
Edges::
        406179373
        406177581
        406074029
        406076973
        406073773
        406177837
        406075565
        406179757
        406075949
        21365484
        406076205
        406072493
        406176813
        21368556
        21365228
Faces::
        407557965
        407453677
        21097420
        407555661
        407554541
        407556493
        21102124
        21103244
'''