puts "========"
puts "OCC770"
puts "SAM1636"
puts "========"
puts ""
############################
## Impossible fusing 3 attached shapes
############################

restore [locate_data_file OCC770.brep] a 
explode a
checkshape a_1
checkshape a_2
checkshape a_3

bfuse res1 a_1 a_2

checkshape res1

bfuse result res1 a_3

set square 962546.
set 2dviewer 0