straight-rung-ladder

// Straight Rung Ladder
// A basic parametric ladder model with two side rails and evenly spaced rungs. Designed for use in architectural layouts, equipment modeling, or marine/industrial planning.




@settings(defaultLengthUnit = mm, kclVersion = 1.0)

// --- Dimensions ---
ladderHeight = 2000 // total height of the ladder
ladderWidth = 400 // width between outer edges of side rails
railDepth = 50 // depth of the side rails
railThickness = 30 // thickness of the side rails (front to back)


rungLength = ladderWidth - (railThickness * 2) // horizontal span between rails
rungHeight = 20 // height of each rung (rectangle)
rungDepth = 30 // extrusion depth of each rung
rungCount = 5 // number of rungs
rungSpacing = ladderHeight / (rungCount + 1) // vertical spacing between rungs


// --- Reference Plane ---
basePlane = startSketchOn(YZ)

// --- Side Rails ---
railProfile = startProfile(basePlane, at = [-ladderWidth / 2, 0])
  |> yLine(length = ladderHeight)
  |> xLine(length = railThickness)
  |> yLine(length = -ladderHeight)
  |> line(endAbsolute = [profileStartX(%), profileStartY(%)])
  |> close()
  |> patternLinear2d(
       %,
       instances = 2,
       distance = ladderWidth - railThickness,
       axis = [1, 0],
     )
sideRails = extrude(railProfile, length = railDepth)

// --- Rung Geometry ---
// Rungs are centered within the side rail depth using an offset plane
rungPlane = offsetPlane(YZ, offset = (railDepth - rungDepth) / 2)
rungProfile = startProfile(rungPlane, at = [-rungLength / 2, 0])
  |> yLine(length = rungHeight)
  |> xLine(length = rungLength)
  |> yLine(length = -rungHeight)
  |> close()
rungBody = extrude(rungProfile, length = rungDepth)

// --- Rung Pattern ---
// Evenly distributes the rungs up the ladder
rungs = patternLinear3d(
       rungBody,
       instances = rungCount,
       distance = rungSpacing,
       axis = [0, 0, 1],
     )
  |> translate(z = rungSpacing) // lift to first rung position