A truss structure is a framework composed of triangular units made from straight members connected at joints, often called nodes. Trusses are widely used in architecture, civil engineering, and construction for their ability to support large loads with minimal material.

// Truss Structure
// A truss structure is a framework composed of triangular units made from straight members connected at joints, often called nodes. Trusses are widely used in architecture, civil engineering, and construction for their ability to support large loads with minimal material.
// Categories: Construction

@settings(defaultLengthUnit = in)

// Define parameters
thickness = 4
totalLength = 180
totalWidth = 120
totalHeight = 120
legHeight = 48
topTrussAngle = 25
beamWidth = 4
beamLength = 2
sparAngle = 30
nFrames = 3
crossBeamLength = 82

// Sketch the top frame
topFrameSketch = startSketchOn(YZ)
profile001 = startProfile(topFrameSketch, at = [totalWidth / 2, 0])
  |> xLine(length = -totalWidth, tag = $bottomFace)
  |> yLine(length = 12)
  |> angledLine(angle = topTrussAngle, endAbsoluteX = 0, tag = $tag001)
  |> angledLine(angle = -topTrussAngle, endAbsoluteX = totalWidth / 2, tag = $tag002)
  |> close()

// Create two holes in the top frame sketch to create the center beam
profile002 = startProfile(topFrameSketch, at = [totalWidth / 2 - thickness, thickness])
  |> xLine(endAbsolute = thickness / 2)
  |> yLine(endAbsolute = segEndY(tag001) - thickness)
  |> angledLine(endAbsoluteX = profileStartX(%), angle = -topTrussAngle)
  |> close()

profile003 = startProfile(topFrameSketch, at = [-totalWidth / 2 + thickness, thickness])
  |> xLine(endAbsolute = -thickness / 2)
  |> yLine(endAbsolute = segEndY(tag001) - thickness)
  |> angledLine(endAbsoluteX = profileStartX(%), angle = 180 + topTrussAngle)
  |> close()
profile004 = subtract2d(profile001, tool = profile002)
subtract2d(profile001, tool = profile003)

// Extrude the sketch to make the top frame
topFrame = extrude(profile001, length = beamLength)

// Spar 1
sketch002 = startSketchOn(offsetPlane(YZ, offset = .1))
profile006 = startProfile(sketch002, at = [thickness / 2 - 1, 14])
  |> angledLine(angle = sparAngle, length = 25)
  |> angledLine(angle = -topTrussAngle, length = 5)
  |> angledLine(angle = 180 + sparAngle, endAbsoluteX = profileStartX(%))
  |> close()

spar001 = extrude(profile006, length = 1.8)

// Spar2
profile007 = startProfile(sketch002, at = [-thickness / 2 + 1, 14])
  |> angledLine(angle = 180 - sparAngle, length = 25)
  |> angledLine(angle = 180 + topTrussAngle, length = 5)
  |> angledLine(angle = -sparAngle, endAbsoluteX = profileStartX(%))
  |> close()

spar002 = extrude(profile007, length = 1.8)

// Combine the top frame with the intermediate support beams
newFrame = topFrame + spar001 + spar002

// Create the two legs on the frame
leg001Sketch = startSketchOn(offsetPlane(XY, offset = .1))
legProfile001 = startProfile(leg001Sketch, at = [0, -totalWidth / 2])
  |> xLine(length = beamLength - .1)
  |> yLine(length = beamWidth - 1)
  |> xLine(endAbsolute = profileStartX(%))
  |> close()

legProfile002 = startProfile(leg001Sketch, at = [0, totalWidth / 2])
  |> xLine(length = beamLength - .1)
  |> yLine(length = -(beamWidth - 1))
  |> xLine(endAbsolute = profileStartX(%))
  |> close()
leg001 = extrude(legProfile001, length = -legHeight - .1)
leg002 = extrude(legProfile002, length = -legHeight - .1)

// Combine the top frame with the legs and pattern
fullFrame = newFrame + leg001 + leg002
  |> patternLinear3d(instances = nFrames, distance = crossBeamLength + beamLength, axis = [-1, 0, 0])

// Create the center cross beam
centerCrossBeamSketch = startSketchOn(YZ)
profile005 = startProfile(centerCrossBeamSketch, at = [0, segEndY(tag001) - 1])
  |> angledLine(angle = -topTrussAngle, length = beamWidth * 3 / 8)
  |> yLine(length = -beamWidth * 3 / 8)
  |> angledLine(angle = 180 - topTrussAngle, length = beamWidth * 3 / 8)
  |> angledLine(angle = 180 + topTrussAngle, length = beamWidth * 3 / 8)
  |> yLine(length = beamWidth * 3 / 8)
  |> line(endAbsolute = [profileStartX(%), profileStartY(%)])
  |> close()

// Extrude the center cross beam and pattern to every frame
centerCrossBeam = extrude(profile005, length = -crossBeamLength)
  |> patternLinear3d(instances = nFrames - 1, distance = crossBeamLength + beamLength, axis = [-1, 0, 0])

// Create the two side cross beams
sideCrossBeamSketch = startSketchOn(-YZ)
profile008 = startProfile(
       sideCrossBeamSketch,
       at = [
         -totalWidth / 2 + 0.5,
         segEndY(tag002) - .5
       ],
     )
  |> yLine(length = -beamLength)
  |> xLine(length = 3 / 4 * beamWidth)
  |> yLine(length = beamLength)
  |> close()
profile009 = startProfile(sideCrossBeamSketch, at = [totalWidth / 2, segEndY(tag002) - .5])
  |> yLine(length = -beamLength)
  |> xLine(length = -3 / 4 * beamWidth)
  |> yLine(length = beamLength)
  |> close()

// Extrude the side cross beams and pattern to every frame.
extrude([profile008, profile009], length = crossBeamLength)
  |> patternLinear3d(instances = nFrames - 1, distance = crossBeamLength + beamLength, axis = [-1, 0, 0])


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