puts "=============================================="
puts "OCC31992: Offset of closed B-spline edge fails"
puts "=============================================="
puts ""

restore [locate_data_file bug31992.brep] a
wire a a
mkplane a a

mkoffset result a 20 0.1 -approx

top
fit

checkview -screenshot -2d -path ${imagedir}/${test_image}.png

for {set i 1} {$i<=20} {incr i} {
	checkshape result_${i}
	set tolres [checkmaxtol result_${i}]
	if { ${tolres} > 1.001e-7} {
		puts "Error: bad tolerance of result"
	}
}

checknbshapes result_1 -t -vertex 175 -edge 175 -wire 1
checkprops result_1 -l 9.16454
checknbshapes result_2 -t -vertex 175 -edge 175 -wire 1
checkprops result_2 -l 9.79285
checknbshapes result_3 -t -vertex 175 -edge 175 -wire 1
checkprops result_3 -l 10.4212
checknbshapes result_4 -t -vertex 175 -edge 175 -wire 1
checkprops result_4 -l 11.0495
checknbshapes result_5 -t -vertex 175 -edge 175 -wire 1
checkprops result_5 -l 11.6778
checknbshapes result_6 -t -vertex 173 -edge 173 -wire 1
checkprops result_6 -l 12.3061
checknbshapes result_7 -t -vertex 169 -edge 169 -wire 1
checkprops result_7 -l 12.9344
checknbshapes result_8 -t -vertex 167 -edge 167 -wire 1
checkprops result_8 -l 13.5626
checknbshapes result_9 -t -vertex 165 -edge 165 -wire 1
checkprops result_9 -l 14.1907
checknbshapes result_10 -t -vertex 162 -edge 162 -wire 1
checkprops result_10 -l 14.8189
checknbshapes result_11 -t -vertex 158 -edge 158 -wire 1
checkprops result_11 -l 15.447
checknbshapes result_12 -t -vertex 155 -edge 155 -wire 1
checkprops result_12 -l 16.0748
checknbshapes result_13 -t -vertex 154 -edge 154 -wire 1
checkprops result_13 -l 16.7025
checknbshapes result_14 -t -vertex 152 -edge 152 -wire 1
checkprops result_14 -l 17.3303
checknbshapes result_15 -t -vertex 150 -edge 150 -wire 1
checkprops result_15 -l 17.958
checknbshapes result_16 -t -vertex 148 -edge 148 -wire 1
checkprops result_16 -l 18.5855
checknbshapes result_17 -t -vertex 147 -edge 147 -wire 1
checkprops result_17 -l 19.213
checknbshapes result_18 -t -vertex 147 -edge 147 -wire 1
checkprops result_18 -l 19.8405
checknbshapes result_19 -t -vertex 146 -edge 146 -wire 1
checkprops result_19 -l 20.4681
checknbshapes result_20 -t -vertex 145 -edge 145 -wire 1
checkprops result_20 -l 21.0957