puts "========"
puts "OCC349"
puts "1. Hidden line removal algorithm works incorrect in the perspective view"
puts "========"

vinit
box b 100 900 300
set 3dviewer 1
vdisplay b

OCC280 1 0

vfit

set x1 135
set y1 170

set x2 314
set y2 97

set x3 172
set y3 184

set x4 32
set y4 241

set x5 156
set y5 263

set x6 305
set y6 186

set x7 186
set y7 280

set x8 54
set y8 342

set x9 32
set y9 286

set x10 295
set y10 142

set x11 322
set y11 153

set x12 56
set y12 305

#
#              ___________2________________
#             /|                          /|
#            / |                         / |
#           /  |                        /  |
#          /   |                       /   |
#         /    |                      /    |
#        1     |                     3     |
#       /      |                    /      |
#      /       |                   /       |
#     /        |                  /        |
#    /         |                 /         |
#   ----------------4------------          |
#   |          |                |          |
#   |          |                |          |
#   |          |                |          |
#   |         10                |         11
#   |          |                |          |
#   |          |                |          |
#   |          |                |          |
#   |          |                |          |
#   |          |                |          |
#   9          |               12          |
#   |          |___________6____|__________|
#   |         /                 |         /
#   |        /                  |        /
#   |       /                   |       /
#   |      /                    |      /
#   |     5                     |     /
#   |    /                      |    7
#   |   /                       |   /
#   |  /                        |  /
#   | /                         | /
#   |/                          |/
#   |--------------8------------|
#
#

checkcolor ${x1} ${y1} 1 1 0
checkcolor ${x2} ${y2} 1 1 0
checkcolor ${x3} ${y3} 1 1 0
checkcolor ${x4} ${y4} 1 1 0
checkcolor ${x7} ${y7} 1 1 0
checkcolor ${x8} ${y8} 1 1 0
checkcolor ${x9} ${y9} 1 1 0
checkcolor ${x11} ${y11} 1 1 0
checkcolor ${x12} ${y12} 1 1 0
checkcolor ${x5} ${y5} 0 0 0
checkcolor ${x6} ${y6} 0 0 0
checkcolor ${x10} ${y10} 0 0 0

set only_screen 1