polyline p 0 0 0 10 0 0 10 0 10 5 0 10 5 0 5 0 0 5 0 0 0
mkplane f p
prism s f 0 5 0

# make the shape periodic
makeperiodic sp s -x 10 -z 10 -y 5

checkshape sp
checknbshapes sp -vertex 16 -edge 24 -wire 10 -face 10 -shell 1 -solid 1 -t
checkprops sp -s 350 -v 375

# get history of the operation
savehistory h

# check modification of the bottom and side faces
explode s f
modified m h s_1

checknbshapes m -vertex 6 -edge 7 -wire 2 -face 2 -t
explode m f
periodictwins t1 m_1
periodictwins t2 m_2

compound t1 t2 t
checknbshapes t -face 1 -t


explode s f
modified m h s_2

checknbshapes m -vertex 6 -edge 7 -wire 2 -face 2 -t
explode m f
periodictwins t1 m_1
periodictwins t2 m_2

compound t1 t2 t
checknbshapes t -face 1 -t


# repeat the shape
repeatshape res -x 1 -y 2

checkshape res
checknbshapes res -vertex 56 -edge 102 -wire 53 -face 53 -shell 6 -solid 6 -t
checkprops res -s 2100 -v 2250


# get repetition history
savehistory h

# get generations of bottom face
generated g h s_1

checkshape g
checknbshapes g -vertex 20 -edge 31 -wire 12 -face 12 -t
checkprops g -s 300

# get generations of the top face
generated g h s_3

checkshape g
checknbshapes g -vertex 16 -edge 20 -wire 6 -face 6 -t
checkprops g -s 150

foreach f [explode g f] {
  periodictwins t $f
  checkshape t
  checknbshapes t -wire 11 -face 11 -t
  checkprops t -s 275
}

# clear repetitions
clearrepetitions

savehistory h

# now generated for bottom face should be empty
if {![regexp "No shapes were generated from the shape." [generated g1 h s_1]]} {
  puts "Error: history is not cleared"
}