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General Program Information

Input Definitions

Inputs Needed to Call the Pipe Function
Origin - a 3*1 matrix with x,y,z positions corresponding to the point where the pipe will be drawn
Pipeinr - th inner radius of the pipe
Pipelength - the length of the pipe

Inputs Defined within the Pipe Function
p2 =

  • x : origin0 + outerradius(2*pipeinr)
  • y : origin1
  • z : origin2
    p3 =
  • x : origin0 + pipeinr
  • y : origin1
  • z : origin2
    win1 =
  • x : origin0 - outerradius(2*pipeinr)
  • y : origin1 - outerradius(2*pipeinr)
  • z : origin2
    win2 =
  • x : origin0 + outerradius(2*pipeinr)
  • y : origin1 + outerradius(2*pipeinr)
  • z : origin2

Pipeoutr - the outer radius of the pipe, found from the pipe database using the outerradius(2*Pipeinr) function

Technical Program Outline

Note: All coordinates are referenced in top view in the program unless otherwise specified


zoomwin- zooms on a window space directly around where the pipe is to be draw (as shown above - actual window size relative to pipe that is to be drawn).

zoomwin <-- zoomwin(win1,win2)

win1 =

  • x : origin0 - outerradius(2*pipeinr)
  • y : origin1 - outerradius(2*pipeinr)
  • z : origin2

win2 =

  • x : origin0 + outerradius(2*pipeinr)
  • y : origin1 + outerradius(2*pipeinr)
  • z : origin2



cylinder1 - Draws the larger of the two cylinders needed to create a pipe. The cylinder has pipeoutr as the radius. From topview, the cylinder draws up towards the viewer with the pipe origin at the bottom base.

cylinder1 <-- cylinder(origin,pipeoutr,pipelength)

origin =

  • x : origin0
  • y : origin1
  • z : origin2

pipeoutr : outerradius(2*pipeinr)

pipelength : pipelength



cylinder2 - Draws the smaller of the two cylinders needed to create the pipe. The cylinder has pipeinr as the radius. From topview, the cylinder draws up towards the viewer with the pipe origin at the bottom base. This inner cylinder will then be subtracted to create the hollow pipe

cylinder2 <-- cylinder(origin,pipeinr,pipelength)

origin =

  • x : origin0
  • y : origin1
  • z : origin2

pipeinr : pipeinr

pipelength : pipelength


subtract1 - In order to create the hollow pipe, the inner cylinder must be subtracted from the outer cylinder. The subtract function selects p2, on the edge of the inner cylinder, to select the inner cylinder as the piece to be subtracted. The subtract function selects p3, on the edge of the outer cylinder, to select the outer cylinder to subtract from.

subtract <-- subtract(p2,p3)

p2 =

  • x : origin0 + outerradius(2*pipeinr)
  • y : origin1
  • z : origin2

p3 =

  • x : origin0 + pipeinr
  • y : origin1
  • z : origin2

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