Repository navigation
Expand file tree
/
Copy pathindex.html
More file actions
489 lines (459 loc) · 29.8 KB
/
Copy pathindex.html
File metadata and controls
489 lines (459 loc) · 29.8 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>BIMScript: Material-Aware Structured Scene Programs for BIM Ingestion</title>
<meta name="google-site-verification" content="r7kQZKpFugfcLYFKmXw2x6WeTqvzTsJZSEoBmKOpRNQ" />
<meta name="description" content="BIMScript turns a scan into a material- and condition-aware BIM program: a structured scene language whose every command maps one-to-one onto a native Revit/IFC object.">
<meta property="og:title" content="BIMScript: Material-Aware Structured Scene Programs for BIM Ingestion">
<meta property="og:description" content="A structured scene language in which every element carries geometry, material, and condition -- and maps one-to-one onto a native Revit/IFC object.">
<meta property="og:image" content="https://BIMScriptWorld.github.io/BIMScript/static/images/teaser_c_layout3d.jpg">
<meta property="og:type" content="website">
<meta name="twitter:card" content="summary_large_image">
<link rel="icon" href="static/images/icon.png?v=3">
<link rel="apple-touch-icon" href="static/images/icon_1024.png?v=3">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bulma@0.9.4/css/bulma.min.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
<link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Google+Sans:wght@400;500;700&family=Noto+Sans:wght@400;600&display=swap">
<link rel="stylesheet" href="static/css/index.css?v=3">
</head>
<body>
<!-- ============================ HERO ============================ -->
<section class="hero">
<div class="hero-body">
<div class="container is-max-desktop has-text-centered">
<img src="static/images/bimscript_icon_full.jpg?v=2" alt="BIMScript" class="bs-icon">
<h1 class="title is-2 bs-title">BIMScript: Material-Aware Structured<br>Scene Programs for BIM Ingestion</h1>
<div class="is-size-5 bs-authors">
<span class="author-block"><a href="https://prakashknaikade.github.io/" target="_blank">Prakash Kondibhau Naikade</a><sup>1,2,3</sup></span>,
<span class="author-block"><a href="https://vbn.aau.dk/en/persons/tbm" target="_blank">Thomas B. Moeslund</a><sup>1,2,3</sup></span>,
<span class="author-block"><a href="https://vbn.aau.dk/en/persons/anmo" target="_blank">Andreas Møgelmose</a><sup>1,2,3</sup></span>
</div>
<div class="is-size-6 bs-affil">
<sup>1</sup>AI:Xpertise Lab, Aalborg University ·
<sup>2</sup>Visual Analysis and Perception Laboratory, Aalborg University ·
<sup>3</sup>Pioneer Centre for Artificial Intelligence
</div>
<div class="bs-buttons">
<a class="button is-rounded is-dark" href="https://arxiv.org/abs/2608.21447" target="_blank">
<span class="icon"><i class="ai ai-arxiv"></i><i class="fas fa-file-lines"></i></span><span>arXiv</span></a>
<a class="button is-rounded is-dark" href="paper/BIMScript_arxiv_2026.pdf" target="_blank">
<span class="icon"><i class="fas fa-file-pdf"></i></span><span>Paper</span></a>
<a class="button is-rounded is-dark" href="https://youtu.be/EnbtevDCsKw">
<span class="icon"><i class="fas fa-play"></i></span><span>Video</span></a>
<span class="button is-rounded is-dark is-soon">
<span class="icon"><i class="fab fa-github"></i></span><span>Code — coming soon</span></span>
<a class="button is-rounded is-dark" href="https://github.com/BIMScriptWorld/BIMScript2Revit" target="_blank">
<span class="icon"><i class="fas fa-cubes"></i></span><span>Revit add-in — BIMScript2Revit</span></a>
</div>
</div>
</div>
</section>
<!-- ============================ NAV ============================ -->
<nav class="bs-nav" id="bs-nav">
<div class="container is-max-desktop">
<a href="#abstract">Abstract</a><a href="#video">Video</a><a href="#results">Results</a><a href="#program">Program</a>
<a href="#method">Method</a><a href="#bim">BIM</a>
<a href="#numbers">Numbers</a><a href="#applications">Applications</a>
<a href="#limitations">Limitations</a><a href="#code">Code & data</a><a href="#cite">Cite</a>
</div>
</nav>
<!-- ============================ TEASER ============================ -->
<section class="section bs-tight">
<div class="container is-max-desktop">
<div class="bs-teaser-grid">
<figure class="bs-col">
<img class="bs-main" src="static/images/teaser_a_pointcloud3d.jpg?v=2" alt="Input point cloud">
<div class="bs-frames">
<img src="static/images/frame_0.jpg?v=2" alt="Egocentric keyframe 1">
<img src="static/images/frame_1.jpg?v=2" alt="Egocentric keyframe 2">
<img src="static/images/frame_2.jpg?v=2" alt="Egocentric keyframe 3">
</div>
<figcaption>Point cloud + egocentric keyframes</figcaption>
</figure>
<div class="bs-mid">
<div class="bs-mid-label">BIMScript</div>
<svg class="bs-net" viewBox="0 0 74 46" aria-label="encoder-decoder">
<g stroke="#c9d2de" stroke-width="1">
<line x1="12" y1="10" x2="37" y2="6"/><line x1="12" y1="10" x2="37" y2="18"/>
<line x1="12" y1="23" x2="37" y2="6"/><line x1="12" y1="23" x2="37" y2="28"/>
<line x1="12" y1="36" x2="37" y2="18"/><line x1="12" y1="36" x2="37" y2="40"/>
<line x1="37" y1="6" x2="62" y2="10"/><line x1="37" y1="18" x2="62" y2="10"/>
<line x1="37" y1="28" x2="62" y2="23"/><line x1="37" y1="40" x2="62" y2="36"/>
<line x1="37" y1="18" x2="62" y2="23"/><line x1="37" y1="28" x2="62" y2="36"/>
</g>
<g fill="#242a33">
<circle cx="12" cy="10" r="3"/><circle cx="12" cy="23" r="3"/><circle cx="12" cy="36" r="3"/>
<circle cx="37" cy="6" r="3"/><circle cx="37" cy="18" r="3"/>
<circle cx="37" cy="28" r="3"/><circle cx="37" cy="40" r="3"/>
<circle cx="62" cy="10" r="3"/><circle cx="62" cy="23" r="3"/><circle cx="62" cy="36" r="3"/>
</g>
</svg>
<div class="bs-arrow"><i class="fas fa-arrow-right-long"></i></div>
<img class="bs-icon" src="static/images/bimscript_icon_full.jpg?v=2" alt="BIMScript">
</div>
<figure class="bs-col">
<img class="bs-main bs-grow" src="static/images/teaser_c_layout3d.jpg?v=2" alt="Predicted BIM">
<figcaption>A program — every element with material and condition</figcaption>
</figure>
</div>
<div class="bs-legend">
<span><i style="--c:#9c6231"></i>wood paneling</span>
<span><i style="--c:#f06292"></i>wallpaper</span>
<span><i style="--c:#cf9226"></i>painted plaster</span>
<span><i style="--c:#f7c59f"></i>door</span>
<span><i style="--c:#53f4ff"></i>window</span>
</div>
<div class="bs-videos">
<figure>
<video src="static/videos/wipe_28395.mp4" poster="static/images/wipe_28395_poster.jpg"
autoplay loop muted playsinline preload="metadata"></video>
<figcaption>Scene 28395 — four materials recovered</figcaption>
</figure>
<figure>
<video src="static/videos/wipe_84289.mp4" poster="static/images/wipe_84289_poster.jpg"
autoplay loop muted playsinline preload="metadata"></video>
<figcaption>Scene 84289 — every element recovered</figcaption>
</figure>
</div>
<p class="bs-videos-note">Decoded Programs</p>
</div>
</section>
<!-- ============================ TL;DR ============================ -->
<section class="section bs-tight">
<div class="container is-max-desktop">
<div class="columns is-variable is-4">
<div class="column"><div class="bs-card">
<div class="bs-card-k">What</div>
<p>Every wall, door and window carries a <b>material</b> and a <b>condition</b> token, supervised by a
VLM-distilled material passport over <b>1.9M elements</b>.</p></div></div>
<div class="column"><div class="bs-card">
<div class="bs-card-k">Fast</div>
<p>Decoding is bound by <b>overhead, not compute</b>. An output-exact CUDA-graph decoder cuts
6.40→1.91 ms/step (<b>3.4×</b>), plus grammar-parallel draft-and-verify.</p></div></div>
<div class="column"><div class="bs-card">
<div class="bs-card-k">Exactly where</div>
<p>A bounded <b>sub-bin offset head</b> escapes the 5 cm token grid, doubling F1@2 cm and
locating where the residual error really lives.</p></div></div>
</div>
</div>
</section>
<!-- ============================ ABSTRACT ============================ -->
<section class="section bs-tight" id="abstract">
<div class="container is-max-desktop">
<h2 class="title is-4 has-text-centered">Abstract</h2>
<div class="content bs-abstract">
<p>Structured-language models such as SceneScript reconstruct a scene as a short program of parametric
commands, an editable and semantically explicit representation. We ask three questions that stand between
such models and automated ingestion of existing buildings into BIM tools, studied here on synthetic scans:
<i>what</i> is the scene made of, <i>how fast</i> can it be produced, and <i>exactly where</i> is each
element. BIMScript answers all three within one grammar. First, we extend the layout language with
per-element <i>material</i> and <i>condition</i> attributes, supervised by a vision-language-model
material-passport corpus we build over 100k synthetic scenes (1.9M pseudo-labeled elements), and route
image appearance to the material tokens through a lifted-feature encoder. Second, we show that
autoregressive decoding of these programs is dominated not by compute but by kernel-launch and
host-synchronization overhead, and remove it with an output-exact CUDA-graph decoder (3.4×) plus a
grammar-parallel, tolerance-verified draft-and-verify scheme that exploits the deterministic entity schema.
Third, we address the model's 5 cm token-grid granularity with training-free geometric snapping and a
hybrid discrete–continuous decoder head that regresses a sub-bin offset. Because each command maps
one-to-one onto a native Revit object, we validate direct ingestion end to end with a working add-in and its
IFC4 export, and the program's language form supports LLM-driven, sustainability-aware reasoning over the
built asset.</p>
</div>
</div>
</section>
<!-- ============================ VIDEO ============================ -->
<section class="section bs-tight" id="video">
<div class="container is-max-desktop">
<h2 class="title is-4 has-text-centered">Video</h2>
<div class="bs-video"><iframe
src="https://www.youtube-nocookie.com/embed/EnbtevDCsKw"
title="BIMScript: Material-Aware Structured Scene Programs for BIM Ingestion"
loading="lazy" referrerpolicy="strict-origin-when-cross-origin"
allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share"
allowfullscreen></iframe></div>
</div>
</section>
<!-- ============================ RESULTS (slider) ============================ -->
<section class="section bs-tight" id="results">
<div class="container is-max-desktop">
<h2 class="title is-4 has-text-centered">Scan2BIM</h2>
<p class="has-text-centered bs-sub">Drag the handle. Left is the input point cloud; right is the program
BIMScript decodes from it, with walls colored by predicted material and openings by role.
Uncurated validation scenes.</p>
<div class="bs-slider" id="slider">
<img class="bs-img-bim" id="imgBim" src="static/images/bim_84289.jpg?v=2" alt="Predicted BIM">
<div class="bs-clip" id="clip"><img class="bs-img-scan" id="imgScan" src="static/images/scan_84289.jpg?v=2" alt="Input scan"></div>
<div class="bs-handle" id="handle"><span><i class="fas fa-left-right"></i></span></div>
<div class="bs-tag bs-tag-l">Scan</div><div class="bs-tag bs-tag-r">BIMScript</div>
</div>
<div class="bs-scenes" id="scenes">
<button class="is-active" data-id="84289">Scene 84289</button>
<button data-id="52361">Scene 52361</button>
<button data-id="58962">Scene 58962</button>
<button data-id="95940">Scene 95940</button>
</div>
<div class="bs-legend">
<span><i style="--c:#9c6231"></i>wood paneling</span>
<span><i style="--c:#f06292"></i>wallpaper</span>
<span><i style="--c:#cf9226"></i>painted plaster</span>
<span><i style="--c:#43bd43"></i>tile</span>
<span><i style="--c:#f7c59f"></i>door</span>
<span><i style="--c:#53f4ff"></i>window</span>
</div>
<figure class="bs-fig">
<img src="static/images/qualitative.jpg?v=2" alt="Qualitative layout results">
<figcaption>Layout on the first three validation scenes (uncurated): ground truth, prediction, and a zoomed
corner inset. Doors are drawn as swing arcs, windows as blue sill glyphs.</figcaption>
</figure>
</div>
</section>
<!-- ============================ PROGRAM ============================ -->
<section class="section bs-tight" id="program">
<div class="container is-max-desktop">
<h2 class="title is-4 has-text-centered">The output is a program, not a mesh</h2>
<p class="has-text-centered bs-sub">Real decoder output. Every line is an object with parameters —
readable, diffable, editable, and one-to-one with a native BIM element.</p>
<pre class="bs-code"><code><span class="c">make_wall</span>, id=0, a_x=-5.922, a_y=8.741, a_z=-0.002, b_x=-1.907, b_y=8.757, b_z=-0.002,
height=2.700, thickness=0.0, <span class="m">material=wood_paneling</span>, <span class="d">condition=good</span>
<span class="c">make_wall</span>, id=1, a_x=-1.907, a_y=8.757, a_z=-0.002, b_x=-1.875, b_y=1.616, b_z=-0.002,
height=2.700, thickness=0.0, <span class="m">material=wallpaper</span>, <span class="d">condition=good</span>
<span class="c">make_door</span>, id=1000, wall0_id=1, position_x=-1.891, position_y=5.186, position_z=1.012,
width=0.920, height=2.024, <span class="m">material=composite</span>, <span class="d">condition=new</span>
<span class="c">make_window</span>, id=2000, wall0_id=0, position_x=-3.914, position_y=8.749, position_z=1.520,
width=1.480, height=1.200, <span class="m">material=aluminum</span>, <span class="d">condition=good</span></code></pre>
</div>
</section>
<!-- ============================ METHOD ============================ -->
<section class="section bs-tight" id="method">
<div class="container is-max-desktop">
<h2 class="title is-4 has-text-centered">Method</h2>
<p class="bs-sub">A lifted-feature encoder routes image appearance into the sparse point encoder, so the
decoder conditions each material and condition token on the element's own geometry tokens through
self-attention. Three mechanisms then make decoding fast and precise:</p>
<figure class="bs-fig bs-arch">
<div class="bs-arch-scroll">
<svg viewBox="0 0 1360 268" role="img" aria-label="BIMScript pipeline: point cloud and RGB keyframes to a lifted sparse-convolution encoder, transformer decoder, program, and Revit/IFC">
<!-- arrows: explicit heads (markers are unevenly supported) -->
<g stroke="#8c8c8c" stroke-width="1.7" fill="none">
<path d="M162,96 C202,96 198,126 224,131"/>
<path d="M162,184 C202,184 198,154 224,149"/>
<path d="M442,140 H502"/><path d="M692,140 H752"/><path d="M1042,140 H1102"/>
</g>
<g fill="#8c8c8c">
<path d="M224,131 l-9,-5 l1,10 z"/><path d="M224,149 l-9,5 l1,-10 z"/>
<path d="M508,140 l-10,-5 v10 z"/><path d="M758,140 l-10,-5 v10 z"/><path d="M1108,140 l-10,-5 v10 z"/>
</g>
<g stroke="#8c8c8c" stroke-width="1.6">
<rect x="10" y="70" width="152" height="52" rx="6" fill="#f7f7f7"/>
<rect x="10" y="158" width="152" height="52" rx="6" fill="#f7f7f7"/>
<rect x="224" y="88" width="218" height="104" rx="6" fill="#ededff"/>
<rect x="502" y="88" width="190" height="104" rx="6" fill="#ffffd9"/>
<rect x="752" y="88" width="290" height="104" rx="6" fill="#ebffeb"/>
<rect x="1102" y="88" width="178" height="104" rx="6" fill="#fff4e9"/>
</g>
<g font-size="17" fill="#1c2027" text-anchor="middle" font-family="'Noto Sans',sans-serif">
<text x="86" y="102">Point Cloud</text>
<text x="86" y="190">RGB Keyframes</text>
<text x="333" y="134">Lifted Sparse-<tspan x="333" dy="23">Convolution Encoder</tspan></text>
<text x="597" y="134">Transformer<tspan x="597" dy="23">Decoder</tspan></text>
<text x="1191" y="134">Revit / IFC<tspan x="1191" dy="23">object model</tspan></text>
<text x="897" y="134" font-family="ui-monospace,Menlo,Consolas,monospace" font-size="14">make_wall …<tspan x="897" dy="23">material=, condition=</tspan></text>
</g>
<g font-size="15" font-weight="700" text-anchor="middle" font-family="'Noto Sans',sans-serif">
<rect x="222" y="206" width="222" height="28" rx="5" fill="#e6e6ff"/>
<text x="333" y="225" fill="#00008c"><tspan font-style="italic">what</tspan>: material tokens</text>
<rect x="462" y="34" width="270" height="28" rx="5" fill="#f3e6ff"/>
<text x="597" y="53" fill="#46008c"><tspan font-style="italic">fast</tspan>: GraphStep + SchemaDraft</text>
<rect x="518" y="206" width="158" height="28" rx="5" fill="#ffe6e6"/>
<text x="597" y="225" fill="#8c0000"><tspan font-style="italic">where</tspan>: SubBin</text>
</g>
</svg>
</div>
<figcaption>BIMScript overview. A lifted-feature encoder routes image appearance into the point encoder, so
the decoder can condition each material and condition token on the element's own geometry tokens. Decoding
is accelerated by <i>GraphStep</i> and <i>SchemaDraft</i> and refined below the token grid by <i>SubBin</i>,
and every emitted command maps one-to-one onto a native Revit/IFC object.</figcaption>
</figure>
<div class="columns is-variable is-4 bs-mech">
<div class="column"><div class="bs-card">
<div class="bs-card-k">GraphStep</div>
<p>The whole decode step captured in one CUDA graph — zero Python, zero host sync.
<b>6.40→1.91 ms/step</b>, output-exact, no retraining.</p></div></div>
<div class="column"><div class="bs-card">
<div class="bs-card-k">SchemaDraft</div>
<p>A command token fixes the <i>types</i> of all remaining slots, so we draft them in one pass with an
<code>[INFILL]</code> embedding and verify. <b>51%</b> accepted, <b>1.36×</b> wall clock.</p></div></div>
<div class="column"><div class="bs-card">
<div class="bs-card-k">SubBin</div>
<p>A bounded within-bin offset head lifts coordinates off the 5 cm grid.
<b>F1@2 cm 0.034→0.071</b>.</p></div></div>
</div>
</div>
</section>
<!-- ============================ CORPUS ============================ -->
<section class="section bs-tight" id="corpus">
<div class="container is-max-desktop">
<h2 class="title is-4 has-text-centered">A material passport at corpus scale</h2>
<p class="bs-sub">ASE's scenes give exact geometry but no material labels. For every element we gather the
RGB observations that project onto it and prompt a vision-language model on the resulting crops. Two further
cues are computed independently and stored beside the label; not to supply it, but to measure how far
it can be trusted.</p>
<figure class="bs-fig"><img src="static/images/extraction.jpg?v=2" alt="Material passport extraction pipeline">
<figcaption>Surface points are associated to elements, observing keyframes are projected to cut per-element
crops, and the fused label is written back as a material- and condition-annotated floor plan.</figcaption></figure>
<div class="bs-stats">
<div><b>99,990</b><span>scenes</span></div>
<div><b>1,900,908</b><span>elements</span></div>
<div><b>14</b><span>materials</span></div>
<div><b>5</b><span>conditions</span></div>
<div><b>0</b><span>join failures</span></div>
</div>
</div>
</section>
<!-- ============================ BIM ============================ -->
<section class="section bs-tight" id="bim">
<div class="container is-max-desktop">
<h2 class="title is-4 has-text-centered">Straight into Revit and IFC</h2>
<p class="bs-sub">A BIMScript program is already an object model. Our pyRevit add-in creates <i>native</i>
Revit walls with one wall type per predicted material, hosted door and window instances, and the material,
condition and source id as shared parameters on every element. The same document exports to IFC4.</p>
<figure class="bs-fig"><img src="static/images/revit_demo.jpg?v=2" alt="Decoded program ingested into Revit">
<figcaption>A decoded program after ingestion — native Revit walls of the auto-created type
<i>BIMScript - concrete</i>, each carrying its predicted attributes.</figcaption></figure>
<h3 class="title is-5 has-text-centered bs-subhead">BIMScript-to-BIM Mapping</h3>
<div class="table-container">
<table class="table is-fullwidth bs-table">
<thead><tr><th>BIMScript</th><th>Revit API target</th><th>IFC entity / property set</th></tr></thead>
<tbody>
<tr><td><code>make_wall</code></td><td><code>Wall.Create</code> (curve, level, height)</td><td><code>IfcWall</code></td></tr>
<tr><td><code>make_door</code></td><td>hosted <code>FamilyInstance</code> on host wall</td><td><code>IfcDoor</code> + <code>IfcRelFillsElement</code></td></tr>
<tr><td><code>make_window</code></td><td>hosted <code>FamilyInstance</code> on host wall</td><td><code>IfcWindow</code> + <code>IfcRelFillsElement</code></td></tr>
<tr><td><code>material=…</code></td><td>wall/family-type material parameter</td><td><code>IfcMaterial</code> / <code>IfcMaterialLayerSet</code></td></tr>
<tr><td><code>condition=…</code></td><td>shared parameter (custom)</td><td>custom Pset (e.g. <code>Pset_Condition</code>)</td></tr>
</tbody>
</table>
</div>
</div>
</section>
<!-- ============================ NUMBERS ============================ -->
<section class="section bs-tight" id="numbers">
<div class="container is-max-desktop">
<h2 class="title is-4 has-text-centered">Results</h2>
<p class="bs-sub">1,000-scene held-out test split, one greedy decode per scene. Layout is scored over all
ground-truth elements; attributes only over elements matched within 10 cm, so coverage should be read
alongside them. Latency is batch 1 with GraphStep on one L40S.</p>
<div class="table-container">
<table class="table is-fullwidth bs-table bs-table-wide">
<thead><tr><th>Model</th><th>F1@5cm</th><th>AvgF1</th><th>Cov.</th>
<th>Mat. acc.</th><th>Cond. acc.</th><th>Params</th><th>s/scene</th></tr></thead>
<tbody>
<tr><td>SceneScript public ckpt</td><td>0.581</td><td>0.667</td><td>—</td><td>—</td><td>—</td><td>25.9M</td><td>1.47</td></tr>
<tr><td>BIMScript (40k)</td><td>0.577</td><td><b>0.676</b></td><td><b>0.701</b></td><td>0.629</td><td><b>0.842</b></td><td>58.4M</td><td>1.14</td></tr>
<tr><td>BIMScript<sup>+</sup> (60k)</td><td>0.576</td><td>0.669</td><td>0.699</td><td><b>0.639</b></td><td>0.840</td><td>58.5M</td><td><b>1.12</b></td></tr>
</tbody>
</table>
</div>
<p class="bs-note">Adding material and condition costs nothing in geometry: the material-aware model matches
the layout-only baseline on the same splits. BIMScript<sup>+</sup> folds the speed and precision fine-tunes
into a single checkpoint that serves plain decoding, draft-and-verify, and sub-bin refinement at once.</p>
</div>
</section>
<!-- ============================ APPLICATIONS ============================ -->
<section class="section bs-tight" id="applications">
<div class="container is-max-desktop">
<h2 class="title is-4 has-text-centered">Applications</h2>
<p class="bs-sub">Because a BIMScript program is an object model rather than a mesh, it drops into the tools
the AEC industry already runs on — and because it is <i>language</i>, it is equally readable by a
large language model.</p>
<div class="columns is-variable is-4">
<div class="column"><div class="bs-card">
<div class="bs-card-k">Scan2BIM</div>
<p>Turn a captured point cloud into an object-level building model automatically, replacing the manual
hand-tracing step of conventional scan-to-BIM.</p></div></div>
<div class="column"><div class="bs-card">
<div class="bs-card-k">Native Revit & IFC</div>
<p>Programs ingest directly into Revit as native walls and hosted openings carrying material and
condition, and export to the open <b>IFC4</b> standard for exchange.</p></div></div>
<div class="column"><div class="bs-card">
<div class="bs-card-k">LLM-driven AEC</div>
<p>A compact, machine-readable inventory an LLM can reason over: embodied-carbon and life-cycle
assessment, material passports and circularity, maintenance triage, adaptive reuse.</p></div></div>
</div>
<figure class="bs-fig">
<img src="static/images/future_work_xrai.jpg?v=2" alt="XRAI4AEC pipeline linking BIM, digital twins and AEC workflows">
<figcaption>Proposed integrative XRAI4AEC pipeline linking BIM, DTs and multiple AEC workflows. The
pipeline begins with image and pointcloud acquisition from camera and LiDAR sensors, followed by advanced
radiance field reconstruction to generate high-LoD 3D building models. A BIM-Script representation is then
used to create semantically rich integrated BIM and DT models. Finally, a BIM-LLM trained on BIM-Script
data enables reasoning over sustainability-aware tasks including real-estate valuation, lifecycle
assessment (LCA), adaptive reuse and disassembly planning, circular-economy-driven waste reduction
strategies, and more. See our
<a href="https://prakashknaikade.github.io/publications/xrai4aec_survey/" target="_blank">XR/AI for AEC
survey</a> for the broader context.</figcaption>
</figure>
</div>
</section>
<!-- ============================ LIMITATIONS ============================ -->
<section class="section bs-tight" id="limitations">
<div class="container is-max-desktop">
<h2 class="title is-4 has-text-centered">Limitations</h2>
<div class="content bs-limits">
<ul>
<li>Supervision is <b>synthetic</b>, and its material labels are VLM-distilled pseudo-labels —
real-scan generalization and label denoising are open.</li>
<li>Condition is predicted at the level of “is this the default state or not”: the macro
average is carried almost entirely by <code>good</code>, and <code>worn</code> is not recovered.</li>
<li>Reproduction is audited against public artifacts, not a verified replication of SceneScript's
published system.</li>
<li>GraphStep is batch-1 and argmax by construction; SchemaDraft at τ=2 is tolerance-verified rather
than output-exact.</li>
<li>The Revit and IFC path is validated on programs decoded from synthetic scenes, not yet against
professional as-built modeling on real scans.</li>
</ul>
</div>
</div>
</section>
<!-- ============================ CODE ============================ -->
<section class="section bs-tight" id="code">
<div class="container is-max-desktop">
<h2 class="title is-4 has-text-centered">Code & data</h2>
<div class="columns is-variable is-4">
<div class="column"><div class="bs-card bs-soon">
<div class="bs-card-k">BIMScript</div><p>Training, evaluation and decoding code.</p>
<span class="tag">coming soon</span></div></div>
<div class="column"><div class="bs-card">
<div class="bs-card-k">Material Passports for ASE Scenes</div><p>Extraction pipeline and the corpus.</p>
<a class="bs-repo" href="https://github.com/BIMScriptWorld/ASE-Material-Passport" target="_blank" rel="noopener"><i class="fab fa-github"></i> View on GitHub</a></div></div>
<div class="column"><div class="bs-card">
<div class="bs-card-k">BIMScript2Revit</div><p>pyRevit add-in and IFC4 export.</p>
<a class="bs-repo" href="https://github.com/BIMScriptWorld/BIMScript2Revit" target="_blank" rel="noopener"><i class="fab fa-github"></i> View on GitHub</a></div></div>
</div>
</div>
</section>
<!-- ============================ CITE ============================ -->
<section class="section bs-tight" id="cite">
<div class="container is-max-desktop">
<h2 class="title is-4 has-text-centered">Citation</h2>
<pre class="bs-bibtex"><code>@misc{naikade2026bimscript,
title = {BIMScript: Material-Aware Structured Scene Programs for BIM Ingestion},
author = {Naikade, Prakash Kondibhau and Moeslund, Thomas B. and M{\o}gelmose, Andreas},
year={2026},
eprint={2608.21447},
archivePrefix={arXiv},
primaryClass={cs.CV},
url={https://arxiv.org/abs/2608.21447},
}</code></pre>
</div>
</section>
<footer class="footer bs-footer">
<div class="container is-max-desktop has-text-centered">
<p>Page source in <code>docs/</code> of this <a href="https://github.com/BIMScriptWorld/BIMScript" target="_blank">repository</a>. Template adapted from the
<a href="https://github.com/nerfies/nerfies.github.io" target="_blank">Nerfies</a> academic project page,
licensed under <a href="http://creativecommons.org/licenses/by-sa/4.0/" target="_blank">CC BY-SA 4.0</a>.</p>
</div>
</footer>
<script src="static/js/index.js?v=3"></script>
</body>
</html>