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Math World 3D: how avoid hidden parts?

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i have a function for create a plane just using Math 3D:
 

Private Sub DrawPlane(Position As Position3D, Size As Size3D, Rotation As Angle3D, WorldSize As Size3D, color As ColorConstants)
   Dim Points(4) As POINTAPI
   
   Dim NewPoint As POINTAPI
   
   Dim NewPosition3D As Position3D
   Dim RotatedPosition As Position3D
   Dim DestinyPosition As Position3D
   Static FixedPoint0(4) As Position3D
   Dim sizeD As Size3D
   Dim temp As Double
   FillSize3D sizeD, 0, 0, 0
   
   'FillPosition3D RotatedPosition, Position.X + Size.Width / 2, Position.Y + Size.Height / 2, Position.Z + Size.ZDepth / 2
   With Player1.Position
      FillPosition3D RotatedPosition, .X, .Y, .Z  'Camera Position
   End With
   
   
   If …

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