Rectangle Tubes
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 PrerequisiteIntroductionA rectangle tube is a tube with 4 side faces, so it looks like a rectangle frame from the top:  The rectangle tube can be very handy in creating frames or walls. Although you can create a similar shape by composing 4 thin boxes together, it is much easier to create it using this one block:  Let’s go through the parameters: Color SelectionThis input is fairly standard, so we will skip it here. Size in X and Y Directions and Height in Z DirectionThese 3 numbers work in the same way as the X/Y/Z sizes of a box. Cap TypeSimilar to tubes, you can control whether the top and bottom of the rectangle tube are covered up or open:  Note that even with both top and bottom caps, the inside of the rectangle tube is still empty. SidesYou can use less than 4 sides for the rectangle tube as well. You can even show 0 sides, but choose to show the top or bottom cap.  NameThe last input is the name of the object. If it is left blank, a random ID will be assigned.