puts "========"
puts "OCC27835"
puts "BinXCAF - handle correctly faces with NULL surface within BinTools_ShapeSet"
puts "========"
puts ""

set anImgDoc1 $imagedir/${casename}_doc1.png
set anImgDoc2 $imagedir/${casename}_doc2.png
set anImgDiff $imagedir/${casename}_diff.png

pload XDE OCAF MODELING VISUALIZATION

restore [locate_data_file bug27821_nullsurf.brep] s
explode s F

NewDocument D BinXCAF
XAddShape D s
XSetColor D s_1 1 0 0
XShow D
vaxo
vfit
vrotate 3 0 0
vsetdispmode 1
vdump $anImgDoc1

file delete ${imagedir}/test.xbf
StoreTriangulation 1
SaveAs D ${imagedir}/test.xbf
Close D

XOpen ${imagedir}/test.xbf D
XShow D
vsetdispmode 1
vaxo
vfit
vrotate 3 0 0
vdump $anImgDoc2

set aDiffRes [diffimage $anImgDoc2 $anImgDoc1 0.0 0 0 $anImgDiff]
if {$aDiffRes != 0} {
  puts "Error: document has changed after Save/Read"
}