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Sources

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

DimensionValueClassWhat it means
guruSpan4.80 mIf 20% out: 0.96 mInterpolatedSpacing between the soko guru, both ways. This square is the centre of the house and the whole plan grows outward from it — so it also sets how much of the roof the brunjung occupies. Too small, and the roof reads as a wide flat apron with a small hat on it rather than as a steep centre with a skirt around it.No source
ringStep1.55 mIf 20% out: 1.24 mInterpolatedHow far each ring of pillars stands outside the one within it.No source
sokoSection0.22 mMoves no measurementInterpolatedSection of a soko, the pillar.No source
guruHeight3.40 mIf 20% out: 0.68 mInterpolatedHeight of a soko guru from its umpak to the head, where the tumpang sari begins.No source
ringDrop0.78 mIf 20% out: 0.43 mInterpolatedHow much shorter each ring of pillars is than the one within it. Together with the ring spacing this number *is* the penanggap pitch — there is no separate dimension for it, because the pitch of a roof resting on pillars is the height difference over the distance. One consequence is that every penanggap tier has the same pitch: the break this joglo shows is between the penanggap and the brunjung, not between one penanggap tier and the next.No source
umpakHeight0.38 mIf 20% out: 0.08 mInterpolatedHeight of an umpak, the stone a soko stands on.No source
umpakWidth0.44 mMoves no measurementInterpolatedWidth of an umpak at its foot.No source
floorRise0.35 mIf 20% out: 0.07 mInterpolatedHeight of the floor above the ground. A raised floor, not a house on stilts: there is no room beneath it, and this is where the joglo differs most sharply from the other two houses.No source
floorThickness0.08 mIf 20% out: 0.02 mInterpolatedThickness of the floor.No source
wallHeight2.50 mMoves no measurementInterpolatedHeight of the gebyok wall from the floor.No source
wallThickness0.07 mMoves no measurementInterpolatedThickness of a gebyok board and of a senthong partition.No source
senthongDepth2.20 mMoves no measurementInterpolatedDepth of the senthong from the rear wall.No source
tumpangRise0.19 mIf 20% out: 0.19 mInterpolatedHow far each tier of the tumpang sari rises above the one below it.No source
tumpangClose0.62Moves no measurementInterpolatedHow far the tumpang sari’s opening closes from foot to top, as a share of the soko guru half-span. A share rather than a fixed step per tier: eleven tiers step more finely than three rather than closing further — and a stack with a fixed step runs out of opening before it runs out of count, and stops short of the standing it was meant to state.No source
tumpangDepth0.19 mMoves no measurementInterpolatedDepth of a tumpang sari beam in section. Equal to the rise per tier, so the beams stack directly on one another: the short spacer blocks that really sit between tiers are not modelled, and leaving the gap they occupy would stand the stack on air — which the build-order check duly refuses.No source
tumpangWidth0.11 mMoves no measurementInterpolatedWidth of a tumpang sari beam in section.No source
brunjungRise2.90 mIf 20% out: 0.58 mInterpolatedHeight of the molo above the top of the tumpang sari. The brunjung is steep, and it is the roof plane read from a distance.No source
ridgeShare0.50Moves no measurementInterpolatedLength of the molo as a share of the soko guru spacing — not of the length of the house, because the brunjung stands on the soko guru square and its ridge cannot be longer than what it stands on. A joglo molo is far shorter than its building; that is what makes it a hipped roof rather than a gabled one, and what makes it impossible to build by sweeping one section along a ridge.No source
eaveOversail1.15 mIf 20% out: 0.23 mInterpolatedHow far the eave oversails the outer pillar line, so the drip falls clear of the pillar feet. How far the eave drops is not declared separately: the roof carries the penanggap pitch out to the edge, and that pitch is already set by the spacing and the height difference between the rings of pillars.No source
emperRun1.40 mMoves no measurementInterpolatedReach of the emper, the extra low skirt outside the eave. Only the highest grade carries one, and it is that grade’s extra roof tier.No source
emperDrop0.42 mMoves no measurementInterpolatedHow far the emper falls below the main eave. Shallower than the penanggap, so the extra tier reads as a tier.No source
rafterWidth0.07 mMoves no measurementInterpolatedWidth of a rafter in section.No source
rafterDepth0.10 mMoves no measurementInterpolatedDepth of a rafter in section.No source
raftersPerSide9Moves no measurementInterpolatedNumber of rafters per roof plane.No source
moloRadius0.09 mMoves no measurementInterpolatedRadius of the molo, the ridge beam.No source
plateDepth0.20 mMoves no measurementInterpolatedDepth of the plate on each ring.No source
plateWidth0.14 mMoves no measurementInterpolatedWidth of a plate.No source
tileCourseDepth0.26 mMoves no measurementInterpolatedExposed depth of one course of tiles.No source
tileThickness0.04 mMoves no measurementInterpolatedHow far a course of tiles stands proud of the one below it.No source
tileLap0.35Moves no measurementInterpolatedThe share of a course of tiles that the course above laps over.No source
tileBedClearance0.02 mMoves no measurementInterpolatedClearance between the battens and the first course of tiles.No source
pendhapaSpan6.40 mMoves no measurementInterpolatedSide of the pendhapa, the open pavilion at the front.No source
pendhapaGap2.40 mMoves no measurementInterpolatedThe distance between the pendhapa and the dalem. The space between them is the pringgitan, where wayang is performed — the audience in the pendhapa, the screen between the two.No source
pendhapaBrunjung0.70Moves no measurementInterpolatedHeight of the pendhapa’s brunjung relative to the dalem’s. The pavilion stands lower than the house, and should: the place where guests are received does not overtop the place where the household lives.No source
pendhapaGuruShare0.42Moves no measurementInterpolatedThe pendhapa’s soko guru spacing, as a share of its side.No source
hipRafterGirth0.75Moves no measurementInterpolatedGirth of a hip rafter relative to a common one.No source
sheathingOffset0.50Moves no measurementInterpolatedHow far the roof boarding sits above the rafter axis, as a share of rafter depth.No source
pendhapaHeight3.00 mMoves no measurementInterpolatedHeight of the pendhapa’s own soko guru.No source
sundukDepth0.20 mIf 20% out: 0.04 mInterpolatedDepth of a sunduk, the beam tying the pillar heads.No source
sundukWidth0.12 mMoves no measurementInterpolatedWidth of a sunduk.No source
purusRun0.65Moves no measurementInterpolatedHow far a pillar head runs up into the sunduk, as a share of the sunduk’s depth.No source
sokoSeat0.28Moves no measurementInterpolatedDepth of the dish in the umpak that the pillar foot seats into, as a share of stone height.No source
jointEngagement0.30Moves no measurementInterpolatedDepth of the tested joint engagement, as a share of the smaller member.No source
floorBoardWidth0.24 mMoves no measurementInterpolatedWidth of one floor board.No source
sokoGuruFour4Moves no measurementCanonFour soko guru carry the centre of the house, and the square between them is that centre.Prijotomo, J., Ideas and Forms of Javanese Architecture (Gadjah Mada University Press, Yogyakarta, 1984).
tumpangIsOdd1Moves no measurementCanonThe tumpang sari has an odd number of tiers, and the count reads as standing.Dakung, S., Arsitektur Tradisional Daerah Istimewa Yogyakarta (Departemen Pendidikan dan Kebudayaan, Jakarta).
gradedSeries1.00Moves no measurementCanonThe joglo comes as a named graded series, each grade adding a roof tier and a ring of pillars. The names are documented; how many tiers each name carries here is the author’s reading.Dakung, S., Arsitektur Tradisional Daerah Istimewa Yogyakarta (Departemen Pendidikan dan Kebudayaan, Jakarta).
senthongTengahEmpty1Moves no measurementCanonThree senthong at the back of the dalem, and the middle one is left empty. The most meaningful room in this house is the one nobody occupies.Tjahjono, G., “Center and Duality in the Javanese Dwelling”, in Bourdier, J.-P. & AlSayyad, N. (eds), Dwellings, Settlements and Tradition (University Press of America, 1989).
centreNotStack1.00Moves no measurementCanonThis house divides from the centre outward, not from the ground upward. There is no underfloor and no three stacked worlds; there is a centre under the brunjung and a periphery under the penanggap.Tjahjono, G., “Center and Duality in the Javanese Dwelling”, in Bourdier, J.-P. & AlSayyad, N. (eds), Dwellings, Settlements and Tradition (University Press of America, 1989).
noNails1.00Moves no measurementCanonPegged purus joints; the frame goes up without nails and comes apart again.Frick, H., Pola Struktural dan Teknik Bangunan di Indonesia (Kanisius, Yogyakarta, 1997).
hipped1.00Moves no measurementCanonThe roof is a stepped hip: the molo is shorter than the building, and four planes fall away to the eave.Prijotomo, J., Ideas and Forms of Javanese Architecture (Gadjah Mada University Press, Yogyakarta, 1984).
seatedOnStone1Moves no measurementCanonThe soko stand on umpak stones; they are not buried.Frick, H., Pola Struktural dan Teknik Bangunan di Indonesia (Kanisius, Yogyakarta, 1997).
walledYard1Moves no measurementCanonThe omah stands inside a walled pekarangan, with the pendhapa in front and the yard between. A Javanese house is not an object in a field: it is the back of a yard entered from the front.Dakung, S., Arsitektur Tradisional Daerah Istimewa Yogyakarta (Departemen Pendidikan dan Kebudayaan, Jakarta).
pekaranganDepth24.00 mMoves no measurementInterpolatedDepth of the pekarangan from the front wall to the back of the house.No source
yardWallHeight1.20 mMoves no measurementInterpolatedHeight of the yard wall, with the entrance in the front. Low enough not to hide the house from outside; the height is the author’s.No source
yardWallThickness0.22 mMoves no measurementInterpolatedThickness of that wall.No source
gateWidth3.00 mMoves no measurementInterpolatedWidth of the entrance opening at the front of the yard.No source
pekaranganWidth20.00 mMoves no measurementInterpolatedWidth of the pekarangan.No source

Bibliography

  • prijotomo-1984 · reference

    Prijotomo, J., Ideas and Forms of Javanese Architecture (Gadjah Mada University Press, Yogyakarta, 1984).

  • dakung-depdikbud · reference

    Dakung, S., Arsitektur Tradisional Daerah Istimewa Yogyakarta (Departemen Pendidikan dan Kebudayaan, Jakarta).

  • frick-1997 · reference

    Frick, H., Pola Struktural dan Teknik Bangunan di Indonesia (Kanisius, Yogyakarta, 1997).

  • tjahjono-1989 · ethnography

    Tjahjono, G., “Center and Duality in the Javanese Dwelling”, in Bourdier, J.-P. & AlSayyad, N. (eds), Dwellings, Settlements and Tradition (University Press of America, 1989).

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.

  1. 1ringStep1.24 mbody depth
  2. 2guruSpan0.96 mbody depth
  3. 3guruHeight0.68 mridge height
  4. 4brunjungRise0.58 mridge height
  5. 5ringDrop0.43 meave height
  6. 6eaveOversail0.23 mroof reach
  7. 7tumpangRise0.19 mridge height
  8. 8umpakHeight0.08 mridge height

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 the centre plane, along the molo

    3066 points; largest mirror deviation 0.00 mm.

  • pass
    Every tenon contained in its mortise

    58 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

    293 parts, every one bearing on something already standing or on the ground.

  • pass
    Mesh integrity: indices, triangles, normals

    744 triangles; indices in range, none degenerate, every normal unit length.

  • pass
    The floor is a plinth, not a storey on stilts

    Clearance under the floor 0.43 m — enough to lift the floor off the ground, not enough for anything to be under it.

  • pass
    The molo is shorter than its house, and four planes fall away to the eave

    A molo of 2.40 m over a house of 11.00 m — 78% shorter; its width is zero, so both ends are planes rather than gables.

  • pass
    The roof rests on the rings of pillars rather than merely near them

    3 rings of pillars → 4 tiers of roof; each sits on its beam within 0 mm.

  • pass
    The tumpang sari closes inward and upward, an odd number of times

    5 tiers, odd; the opening closes 1.19 m from foot to top, and rises 0.95 m.

  • pass
    The senthong tengah is left empty

    Nothing is inside it. The most meaningful room in this house is the one nobody occupies, and this check passes precisely by finding nothing.

  • pass
    Four soko guru at the centre, and each ring outside them is shorter

    Joglo sinom: 3 rings, 4 soko guru; height falls from 3.40 m to 1.84 m going outward.

  • pass
    The pendhapa stands in front, separated by the pringgitan

    17 parts; 2.40 m clear of the dalem — the space between them is the pringgitan, a room made of a gap rather than of walls.

  • pass
    The eave oversails the outer pillar line

    eave 6.65 m from the axis; outer pillar face 5.61 m; oversail 1.04 m.

  • pass
    Tile courses lap with no bare strip; the molo is covered

    55 courses over 9.13 m of slope; smallest lap 1.3%.

  • pass
    Every part declares the dimensions it came from

    293 parts, every one tagged. By least-sourced input: 0 measured, 0 canon, 293 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.

The tumpang sari’s tier count is the rank signal, and it is read by counting from underneath. What is interesting is how it breaks: nothing is set to zero and nothing collapses. The inset is widened, each tier closes further in than the last, and at some point the opening runs out before the count does — the stack shuts before it has made its fifth tier. A rule that cannot be carried out is a different failure from a rule being disobeyed, and it is the one this building is actually exposed to.

The house as built

pass5 / 5tiers built · tiers declared

5 tiers, odd; the opening closes 1.19 m from foot to top, and rises 0.95 m.

Rear prow raised to 1.24 m

fail4 / 5tiers built · tiers declared

4 tiers built, 5 declared

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.