Reference plane

refplane RP0 bearing 23deg at 50'

A reference plane is a datum you name so you can measure to it and build on it. refplane.<id> goes wherever grid.<id> does. It takes one of six forms:

Plumb, at a station: refplane RP0 bearing 23deg at 50'
Plumb, through a point: refplane RV bearing 23deg at (grid.A, grid.1)
Flat: refplane USDECK elev level.L3 - 1'-6"
Tipped: refplane BW bearing 0deg tilt 1:12 at (grid.A, grid.1, level.L1)
Through three points: refplane RP2 through (grid.B, grid.2, level.L1) (grid.B, grid.3, level.L1) (grid.A, grid.2, level.L2)
A hinge, turned about the line where a plumb plane meets a flat one: refplane HG through (grid.B, level.L2) tilt 1:12

A tipped plane takes one of four words, the way the trades say it: a battered wall tilts (its top goes to the right of the bearing), a raked column leans (its top goes the way the bearing points), a roof slopes (it falls the way the bearing points) and a ramp rises (it climbs the way the bearing points). The angle runs strictly between 0deg and 90deg, and a rise over run is the same angle: 1:12 prints 4.764deg. A tipped plane is placed at a point with three terms, the third a level or z.

Four reference planes at bearing 0deg, the bearing pointing north, each tipped 20deg by its word: with tilt the plane stands along the bearing and its top goes to the right, east; with lean it stands square to the bearing and its top goes north; with slope it lies flat and falls north; with rise it lies flat and climbs north

lean and tilt name one plane from bearings 90deg apart: bearing 0deg lean 20deg is bearing 270deg tilt 20deg. rise and slope name one plane from opposite bearings: bearing 0deg rise 20deg is bearing 180deg slope 20deg. refplane.BW + 4' is 4 feet toward the side the top leans to. Off a flat, sloped or rising plane, + 4' is above it; off a plumb plane, it is to the right of the bearing, as a grid’s station counts. A wall runs along, stops at or is held off a plumb reference plane only. A reference plane is included in the compiled output but isn’t drawn by default; loft applications, including the loft app, can choose to display it.

Parameters

Word	Accepts	Required	Meaning
`bearing` `bearing 23deg`	angle	instance · one of: `bearing` · `through` · `elev`	the compass bearing the plane’s line runs at, clockwise from project north — alone, a vertical plane whose station counts to the right of the line; with an angle word, the line it tips about
`through` `through (grid.B, grid.2, level.L1) (grid.B, grid.3, level.L1) (grid.A, grid.2, level.L2)`	line (direction z)	instance · one of: `bearing` · `through` · `elev`	three points the plane passes through, three terms each — the surveyor’s three shots, the front the side they read counter-clockwise from — or, followed by `tilt`, a hinge: a vertical plane and a flat one, the line the plane tilts about
`tilt` `tilt 1:12`	angle	instance · optional	a wall tipped from plumb, its top going right of the bearing — a battered wall; between 0deg and 90deg
`lean` `lean 1:12`	angle	instance · optional	a wall tipped from plumb, its top going the way the bearing runs — a raked column; between 0deg and 90deg
`slope` `slope 4:12`	angle	instance · optional	a floor tipped from level, falling the way the bearing runs — a roof draining; between 0deg and 90deg
`rise` `rise 1:12`	angle	instance · optional	a floor tipped from level, rising the way the bearing runs — a ramp; between 0deg and 90deg
`at` `at 50'`	plane (parallel to this datum) or line (direction z)	instance · optional	with `bearing`, and only with it: a vertical plane’s station along its own normal — a length, or a parallel datum plus a length — or a point the plane passes through, two vertical planes or three terms; a tipped plane takes three
`elev` `elev 22'-6"`	plane (normal z)	instance · one of: `bearing` · `through` · `elev`	a flat plane’s elevation, as a level’s

Reserved

Word	Rung	Meaning	Arrives with
`label`	instance	what the tag prints when it is not the id	a bubble or tag printing text other than the id — the grid’s bubble is the one that ships
`origin`	instance	the frame’s origin — a point on the plane	the sketch grammar — a plane’s frame written as a block: an origin and two directions on the plane
`x`	instance	the frame’s first direction, along the plane	the sketch grammar — a plane’s frame written as a block: an origin and two directions on the plane
`y`	instance	the frame’s second direction, up the plane	the sketch grammar — a plane’s frame written as a block: an origin and two directions on the plane
`normal`	instance	the frame’s third direction, out of the plane’s front	the sketch grammar — a plane’s frame written as a block: an origin and two directions on the plane

Datums

Datum	Shape	Status	Resolution	Rule
(the plane)	plane	core	intrinsic	The plane itself — a declared datum, no selection — referenced as `refplane.<id>` wherever a grid can be: `(grid.A, refplane.R1)`, `along refplane.RP0`, `to refplane.RP0`, `past refplane.RP0`. Its front is the side its normal points to: `refplane.RP0 + 4'` is 4 ft in front of it.

Roles

Never printed: a reference plane shows on screen as a guide, never on paper.

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Reference plane

Parameters

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