puts "========"
puts "Gradient background is lost at some camera positions"
puts "========"

# Test case setup the camera in such a position,
# so that background plane will be clipped by Z-range if not handled by Z-fit.

pload MODELING VISUALIZATION
box b 0 0 -100 100 90 10

vclear
vinit View1
vaxo
vsetgradientbg 180 200 255 180 180 180 2
vzbufftrihedron
vdisplay -dispMode 1 b
vsetlocation b 0 0 1000
vfit

vviewparams -scale 6.66 -eye 48 43 -210 -at 50 45 -95

if { [vreadpixel 100 300 rgb name] != "GRAY74" } { puts "Error: gradient background is not displayed" }

vdump $imagedir/${casename}.png