puts "========"
puts "0025822: Visualization, TKOpenGl - front material should be used instead of back material within distinguish mode turned off"
puts "========"

pload MODELING OCAF XDE
box b 10 10 10
vclear
vinit View1
Close D -silent
NewDocument D BinXCAF
XAddShape D b
XSetColor D b BLUE
explode b f
XSetColor D b_1 RED

XDisplay D
vviewparams -proj 1 0.1 0.1
vfit
vsetdispmode 1

catch { vclipplane delete pln }
vclipplane create pln
vclipplane set pln view Driver1/Viewer1/View1
vclipplane change pln equation -1 0 0 5

# FFP on
if { [vdriver -default] == "TKOpenGl" } {
  vcaps -ffp 1
  set aColorFfp [vreadpixel 200 200 rgb name]
  if { "$aColorFfp" != "RED" } { puts "Error: RED color is expected at the back side (FFP)" }
}

# GLSL on
vcaps -ffp 0
set aColorGlsl [vreadpixel 200 200 rgb name]
if { "$aColorGlsl" != "FIREBRICK" && "$aColorGlsl" != "RED" } { puts "Error: FIREBRICK color is expected at the back side (GLSL)" }
vdump ${imagedir}/${casename}.png