Sources — The Baduy imah — Rumah Adat Nusantara

Every dimension the house is generated from is below, with its class and its citation. This is the project’s honesty layer, and it is given a room of its own because a smooth 3D render implies a precision the sources do not have.

The dimensions

Dimension	Value	Class	Citation
Length of the body, running up the slope.length	7.20 mIf 20% out: 1.44 m	Interpolated	No source
Half-width of the body.halfWidth	2.90 mMoves no measurement	Interpolated	No source
Least clearance from the ground to the underside of the floor, measured at the highest point of the ground. The floor is one level plane; what changes is not the floor but the length of each post.clearance	0.55 mIf 20% out: 0.11 m	Interpolated	No source
Section of a post.postSection	0.15 mMoves no measurement	Interpolated	No source
Height of the stone a post foot stands on. The stones are set where they lie: nothing is dug and nothing is levelled.stoneHeight	0.26 mIf 20% out: 0.05 m	Interpolated	No source
Width of that stone.stoneWidth	0.40 mMoves no measurement	Interpolated	No source
Spacing of the lines of posts along the slope.bay	2.40 mMoves no measurement	Interpolated	No source
Section of a floor beam.beamSection	0.13 mIf 20% out: 0.03 m	Interpolated	No source
Thickness of the palupuh floor: split bamboo, not sawn board.floorThickness	0.05 mIf 20% out: 0.01 m	Interpolated	No source
Height of the woven bilik wall from the floor to the eave.wallHeight	1.90 mIf 20% out: 0.38 m	Interpolated	No source
Thickness of the woven bamboo.wallThickness	0.04 mMoves no measurement	Interpolated	No source
Slope of gentle ground, as rise over run.slopeGentle	0.10Moves no measurement	Interpolated	No source
Slope of medium ground. Kanekes is hill country, and level ground is not what is usual.slopeMedium	0.22If 20% out: 0.42 m	Interpolated	No source
Slope of steep ground. This is the figure the counterexample pushes: on steep enough ground the longest post exceeds a single pole, and the only way out is to cut the ground — which is the thing that is forbidden.slopeSteep	0.34Moves no measurement	Interpolated	No source
Thickness of the slab of ground that is drawn. The ground is not a built part; it is in the model precisely because it is the one thing that may not be changed.groundThickness	0.50 mIf 20% out: 0.10 m	Interpolated	No source
How far the drawn ground runs past the plan of the house.groundMargin	2.50 mIf 20% out: 0.11 m	Interpolated	No source
The longest post one piece of timber gives. Posts are not spliced and timber is not sawn — so this is a hard limit: on steep enough ground the downhill post passes it, and the house cannot stand there without breaking a prohibition.poleLength	3.40 mMoves no measurement	Interpolated	No source
Rise of the ridge above the eave.ridgeRise	2.30 mIf 20% out: 0.46 m	Interpolated	No source
Depth of the overhang.eaveOversail	0.95 mMoves no measurement	Interpolated	No source
Section of a bamboo rafter.rafterSection	0.07 mMoves no measurement	Interpolated	No source
Section of the eave plate.plateSection	0.11 mMoves no measurement	Interpolated	No source
Exposed depth of one course of palm thatch.hateupCourseDepth	0.20 mMoves no measurement	Interpolated	No source
How far a course stands proud of the one below.hateupThickness	0.04 mMoves no measurement	Interpolated	No source
The share of a course the course above laps.hateupLap	0.50Moves no measurement	Interpolated	No source
Clearance between the frame and the first course.hateupBed	0.03 mMoves no measurement	Interpolated	No source
Depth of the sosoro, the front platform where visitors are received. A visitor stops here; the inner room is not where an outsider goes.sosoroDepth	1.80 mMoves no measurement	Interpolated	No source
Depth of the tested joint engagement, as a share of the smaller member.jointEngagement	0.30Moves no measurement	Interpolated	No source
The ground may not be dug or levelled for a house. The stones are set where they lie and the posts are cut to what the ground leaves — so every post is a different length while the floor is one level plane. The other eighteen buildings in this project stand on level ground because a model needs somewhere to start; this one stands on a hillside that is in its own part list, precisely because that is the one thing which may not be changed.groundIsNotCut	1Moves no measurement	Canon	Garna, J. K., Masyarakat Baduy di Banten, dalam Koentjaraningrat (ed.), Masyarakat Terasing di Indonesia (Gramedia, Jakarta, 1993).
Timber is split, not sawn, and posts are not spliced. This prohibition cannot be checked by any model — a sawn beam and a split one are the same shape — and it is stated here because a pack that wrote down only the rules it could test would be quietly editing the tradition to fit the software.noSawnTimber	1Moves no measurement	Canon	Permana, R. C. E., Tata Ruang Masyarakat Baduy (Wedatama Widya Sastra, Jakarta, 2006).
Zero nails in the frame: the joints are lashings and notches. On the Minahasa woloan house a reversible joint is a choice that lets the building be carried away; here it is a prohibition, and the two buildings arrive at the same joint by two unrelated reasons.noIronInTheFrame	0Moves no measurement	Canon	Garna, J. K., Masyarakat Baduy di Banten, dalam Koentjaraningrat (ed.), Masyarakat Terasing di Indonesia (Gramedia, Jakarta, 1993).
A visitor is received on the sosoro, the platform at the front, and does not enter the inner room. The Palembang rumah limas seats a guest on the step that states their standing; this house does not seat them inside at all.guestStopsOutside	1Moves no measurement	Canon	Departemen Pendidikan dan Kebudayaan, Arsitektur Tradisional Daerah Jawa Barat (Proyek Inventarisasi dan Dokumentasi Kebudayaan Daerah, Jakarta).
Baduy Dalam keeps the prohibitions in full and Baduy Luar keeps most of them. This is not a rank: neither is above the other, and the strictest have the least.innerVillagesStricter	1Moves no measurement	Canon	Garna, J. K., Masyarakat Baduy di Banten, dalam Koentjaraningrat (ed.), Masyarakat Terasing di Indonesia (Gramedia, Jakarta, 1993).

Bibliography

garna-1993 · ethnography
Garna, J. K., Masyarakat Baduy di Banten, dalam Koentjaraningrat (ed.), Masyarakat Terasing di Indonesia (Gramedia, Jakarta, 1993).
permana-2006 · ethnography
Permana, R. C. E., Tata Ruang Masyarakat Baduy (Wedatama Widya Sastra, Jakarta, 2006).
iskandar-2016 · ethnography
Iskandar, J. & Iskandar, B. S., Ethnoecology and Sustainable Agriculture among the Baduy, Banten (Biodiversitas / journal literature).
depdikbud-jabar · reference
Departemen Pendidikan dan Kebudayaan, Arsitektur Tradisional Daerah Jawa Barat (Proyek Inventarisasi dan Dokumentasi Kebudayaan Daerah, Jakarta).

Which of these matters most

Nearly every dimension on this page is the author’s own. What the provenance bar does not say is whether that matters. Each row below is computed by rebuilding the house: one dimension is pushed 20%, and the house is measured to see how far it follows. Nothing is estimated — the figures are the difference between two runs of the generator.

1length1.44 mlength of the house
2ridgeRise0.46 mheight of the ridge
3slopeMedium0.42 mheight of the level floor
4wallHeight0.38 mheight of the ridge
5clearance0.11 mheight of the ridge
6groundMargin0.11 mheight of the ridge
7groundThickness0.10 mheight of the ridge
8stoneHeight0.05 mheight of the ridge

If only one dimension could be surveyed, this is the one. This is sensitivity, not uncertainty: it shows what moves, not how likely the value is to be wrong. The 20% is itself the author’s choice.

Invariants

There is no measured drawing yet, so correctness rests on structural truth. These checks fail the build.

pass
Bilateral symmetry about Symmetric across the slope, z = 0 — and deliberately not along it
696 points; largest mirror deviation 0.00 mm.
pass
Every tenon contained in its mortise
16 pasak, takik and tumpu joints; every one engaged.
pass
No joint spans more than one stage
Every joint engages two parts from the same stage or from consecutive ones.
pass
Stage ordering, and nothing below ground
65 parts, every one bearing on something already standing or on the ground.
pass
Mesh integrity: indices, triangles, normals
176 triangles; indices in range, none degenerate, every normal unit length.
pass
Nothing dug and nothing levelled: every stone sits on the ground as it is
10 stones on a 22% slope, and not one of them off its own patch of ground by more than 0 mm. The other eighteen buildings here stand on level ground because a model needs somewhere to start; this one stands on a hillside that is in its own part list.
pass
The floor is one level plane, over ground that is not
The ground falls 1.58 m along the house and the floor does not fall at all. Refusing to level the ground is only a statement if something above it is level; otherwise the house is just a tilted box.
pass
Every post as long as the ground leaves it, and none longer than one pole
4 different lengths, from 0.68 m uphill to 2.26 m downhill, against the 3.40 m one pole gives. The difference between the longest post and the shortest is the slope, stated in metres.
pass
No iron in the frame: lashings and notches only
16 joints, every one a lashing or a notch. The Minahasa woloan house arrives at reversible joints because the building has to be carried away; here the reason is a prohibition, and the two end at the same joint by two unrelated routes.
pass
Thatch courses lap with no bare band
22 courses from eave to ridge.
pass
Every part declares the dimensions it came from
65 parts, every one tagged. By least-sourced input: 0 measured, 0 canon, 65 interpolated.
skipped
Checked against a measured drawing of a real house
Skipped. No measured drawing has been wired in, so there is nothing to compare against. This check will not be made to pass by weakening it.

What a check is preventing

Ten green rows are not a reason to believe anything. So one check is run against a house built to break it, and what is printed below is that check’s own verdict rather than a description of it.

Steepen the ground and everything the builders do stays correct: the stones still sit where they lie, the floor is still one level plane, no iron goes into the frame, nothing is sawn. What happens is that the downhill post grows longer than a single pole, and a post is not spliced. At that point the only way to put a house on that piece of hillside is to cut the hillside — the prohibition the whole building exists to keep. Nineteen buildings, nineteen rules that cannot be carried out, and this is the first where the rule defeats itself.

The house as built

pass3.13 m / 3.40 mlongest post · one pole gives

4 different lengths, from 0.68 m uphill to 3.13 m downhill, against the 3.40 m one pole gives. The difference between the longest post and the shortest is the slope, stated in metres.

Rear prow raised to 0.39 m

fail3.50 m / 3.40 mlongest post · one pole gives

the downhill post is 3.50 m, and one pole gives 3.40 m

The second house is never rendered. It is built during the build, failed, and thrown away.

This bar moves as real surveys are wired in. That movement is the project's progress metric.