OCCT

puts "========"
puts "OCC23386"
puts "========"
puts ""
################################################################################################
##  BRepAlgoAPI_Fuse on two disjoint shapes sometimes loses all geometry from one of the shapes
################################################################################################

restore [locate_data_file bug23386_a.brep] a
restore [locate_data_file bug23386_b.brep] b

bfuse result a b

set nbshapes_a "
Number of shapes in shape
 VERTEX    : 383
 EDGE      : 686
 WIRE      : 297
 FACE      : 297
 SHELL     : 2
 SOLID     : 1
 COMPSOLID : 0
 COMPOUND  : 0
 SHAPE     : 1666
"
checknbshapes a -ref ${nbshapes_a} -t -m "First initial shape"

set nbshapes_b "
Number of shapes in shape
 VERTEX    : 6
 EDGE      : 9
 WIRE      : 5
 FACE      : 5
 SHELL     : 1
 SOLID     : 1
 COMPSOLID : 0
 COMPOUND  : 0
 SHAPE     : 27
"
checknbshapes b -ref ${nbshapes_b} -t -m "Second initial shape"

set nbshapes_expected "
Number of shapes in shape
 VERTEX    : 388
 EDGE      : 695
 WIRE      : 302
 FACE      : 302
 SHELL     : 3
 SOLID     : 2
 COMPSOLID : 0
 COMPOUND  : 1
 SHAPE     : 1693
"
checknbshapes result -ref ${nbshapes_expected} -t -m "result of fuse operation"