// Default values (stage)
  z = 0
  matrix = (a=1, b=0, c=0, d=1, tx=0, ty=0)
  matrix3D = null
  perspectiveProjection = [object PerspectiveProjection]
// Default values (root)
  z = 0
  matrix = (a=1, b=0, c=0, d=1, tx=0, ty=0)
  matrix3D = null
  perspectiveProjection = [object PerspectiveProjection]
// Default values (object)
  z = 0
  matrix = (a=1, b=0, c=0, d=1, tx=0, ty=0)
  matrix3D = null
  perspectiveProjection = null
// Before setting
  z = 0
  matrix = (a=1, b=0, c=0, d=1, tx=0, ty=0)
  matrix3D = null
  perspectiveProjection = null
// After setting to non-null
  z = 0
  matrix = (a=1, b=0, c=0, d=1, tx=0, ty=0)
  matrix3D = null
  perspectiveProjection = [object PerspectiveProjection]
// After setting to null
  z = 0
  matrix = (a=1, b=0, c=0, d=1, tx=0, ty=0)
  matrix3D = null
  perspectiveProjection = null
// After setting stage to null
  z = 0
  matrix = (a=1, b=0, c=0, d=1, tx=0, ty=0)
  matrix3D = null
  perspectiveProjection = [object PerspectiveProjection]
// After setting root to null
  z = 0
  matrix = (a=1, b=0, c=0, d=1, tx=0, ty=0)
  matrix3D = null
  perspectiveProjection = [object PerspectiveProjection]
