Pipe

A hollow cylinder defined by an inner and an outer radius.

Pipe is a hollow cylinder — tubes, rings, cups, chimneys.

Geometry

Closed by an inner wall, an outer wall and top and bottom rings. The pivot is at the center of the bottom face, so a pipe of height h occupies y=0 to y=h.

The smaller of Radius 1 and Radius 2 becomes the inner radius and the larger the outer — swapping them makes no difference.

The wall thickness is |Radius 1 − Radius 2|.

Parameters

Label	Script key	Default	Range	Description
Radius 1	`r1`	1	0.01 ~ 1000	Radius A, in meters
Radius 2	`r2`	0.75	0.01 ~ 1000	Radius B, in meters — the smaller of A and B becomes the inner radius
Height	`h`	1	-1000 ~ 1000	Height in meters
Sides	`sides`	12	3 ~ 128	Divisions around the circumference
Height Segment	`heightsegment`	1	1 ~ 32	Divisions along the height

When the two radii nearly coincide the wall becomes extremely thin, which can produce normal and shading artifacts.

How to create

Drag in empty space to set the first radius.
Click to confirm, then move the mouse to set the second radius — this is where the wall thickness comes from.
Click again, move the mouse up to set the Height, then click once more to finish.

Scene view editing

The ±X and ±Z handles drive the outer radius and the ±Y handles drive Height. The inner radius is set in the Inspector.

Tips

For a cup or planter with a closed bottom, nest a thin Cylinder inside the pipe or convert to an editable mesh and fill the bottom.

Use 24 or more Sides for pipe joints and ring columns.

Script

In a script this shape is written as pipe.

pipe "Tube" r1=0.5 r2=0.4 h=2 sides=24 @0,0,0