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proc BuildBackdrop {minX maxX minY maxY minZ maxZ thickness} {
if { [info command basePlane] == "" } {vtkCubeSource basePlane;}
basePlane SetCenter [expr ($maxX + $minX) / 2.0] $minY [expr ($maxZ + $minZ) / 2.0]
basePlane SetXLength [expr ($maxX - $minX)]
basePlane SetYLength $thickness
basePlane SetZLength [expr ($maxZ - $minZ)]
if { [info command baseMapper] == "" } {vtkPolyDataMapper baseMapper;}
baseMapper SetInput [basePlane GetOutput]
if { [info command base] == "" } {vtkActor base;}
base SetMapper baseMapper
if { [info command backPlane] == "" } {vtkCubeSource backPlane;}
backPlane SetCenter [expr ($maxX + $minX) / 2.0] [expr ($maxY + $minY) / 2.0] $minZ
backPlane SetXLength [expr ($maxX - $minX)]
backPlane SetYLength [expr ($maxY - $minY)]
backPlane SetZLength $thickness
if { [info command backMapper] == "" } {vtkPolyDataMapper backMapper;}
backMapper SetInput [backPlane GetOutput]
if { [info command back] == "" } {vtkActor back;}
back SetMapper backMapper
if { [info command leftPlane] == "" } {vtkCubeSource leftPlane;}
leftPlane SetCenter $minX [expr ($maxY + $minY) / 2.0] [expr ($maxZ + $minZ) / 2.0]
leftPlane SetXLength $thickness
leftPlane SetYLength [expr ($maxY - $minY)]
leftPlane SetZLength [expr ($maxZ - $minZ)]
if { [info command leftMapper] == "" } {vtkPolyDataMapper leftMapper;}
leftMapper SetInput [leftPlane GetOutput]
if { [info command left] == "" } {vtkActor left;}
left SetMapper leftMapper
}
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