Resources Numerical accuracy

Equality comparisons

Where the code asks whether two decimal numbers are exactly equal. A floating-point result can differ from another in the last digit after a few transformations, so a mesh run through several of them can change the length of an edge, or miss a match. Compare with < or > where a range is meant, and with a documented epsilon where equality is.

316 comparisons to look at
149 files
175 likely to matter (against a decimal, or two computed values)
Scanned November 6, 2026

These are places worth checking, not confirmed bugs. The scan reads how the code is written, not what it is meant to do, so some entries are fine as they are: a test against exactly 0 is often a deliberate guard against dividing by zero. It skips text, counts and indexes, and any comparison it cannot be sure involves decimal numbers, so there are likely more in the code than are listed here.

Two computed values libitem.js:1715 in emit CadCraft, BimCraft
```
if (c4 && (c4.x !== c3.x || c4.y !== c3.y || (c4.z || 0) !== (c3.z || 0))) faces.push(q[0], q[2], q[3]);
```
!== in (c4.z || 0) !== (c3.z || 0). Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Library item geometry from blocks, meshes and tables, Lengths and units for Library items.
Two computed values unit-table.js:126 in convert CadCraft, BimCraft, ModelCraft, MarkupCraft, TakeoffCraft, CivilCraft, DetailCraft, PartCraft
```
if (a === b || a.factor === b.factor) return v;
```
=== in a.factor === b.factor. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Unit conversion, Unit table: reading and writing values.
Two computed values usd/earcut.js:162 in findHoleBridge CadCraft, BimCraft, ModelCraft, TakeoffCraft, CivilCraft, DetailCraft, PartCraft
```
if (hy <= p.y && hy >= p.next.y && p.next.y !== p.y) {
```
!== in p.next.y !== p.y. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Polygon triangulation (ear clipping).
Two computed values usd/earcut.js:180 in findHoleBridge CadCraft, BimCraft, ModelCraft, TakeoffCraft, CivilCraft, DetailCraft, PartCraft
```
if (locallyInside(p, hole) && (tan < tanMin || (tan === tanMin && (p.x > m.x || (p.x === m.x && sectorContainsSector(m, p)))))) {
```
=== in p.x === m.x. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Polygon triangulation (ear clipping).
Two computed values usd/earcut.js:195 in getLeftmost CadCraft, BimCraft, ModelCraft, TakeoffCraft, CivilCraft, DetailCraft, PartCraft
```
if (p.x < leftmost.x || (p.x === leftmost.x && p.y < leftmost.y)) leftmost = p;
```
=== in p.x === leftmost.x. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Polygon triangulation (ear clipping).
Two computed values usd/earcut.js:218 in equals CadCraft, BimCraft, ModelCraft, TakeoffCraft, CivilCraft, DetailCraft, PartCraft
```
const equals = (p1, p2) => p1.x === p2.x && p1.y === p2.y;
```
=== in p1.x === p2.x. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Polygon triangulation (ear clipping).
Two computed values usd/earcut.js:218 in equals CadCraft, BimCraft, ModelCraft, TakeoffCraft, CivilCraft, DetailCraft, PartCraft
```
const equals = (p1, p2) => p1.x === p2.x && p1.y === p2.y;
```
=== in p1.y === p2.y. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Polygon triangulation (ear clipping).
Two computed values usd/earcut.js:248 in middleInside CadCraft, BimCraft, ModelCraft, TakeoffCraft, CivilCraft, DetailCraft, PartCraft
```
if (((p.y > py) !== (p.next.y > py)) && p.next.y !== p.y && (px < (p.next.x - p.x) * (py - p.y) / (p.next.y - p.y) + p.x)) inside = !inside;
```
!== in p.next.y !== p.y. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Polygon triangulation (ear clipping).
Two computed values usd/geom.js:92 in valueAt CadCraft, BimCraft, ModelCraft, TakeoffCraft, CivilCraft, DetailCraft, PartCraft
```
if (!a || !b || a.t !== b.t || typeof a.v === 'string' || a.t.startsWith('quat') || a.t.includes('token') || a.t === 'bool') return a;
```
!== in a.t !== b.t. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: USD transforms and placement, USD mesh coordinates in saved and exported files.
Against a whole number people-sim.js:142 in field BimCraft
```
if (Math.abs(di) + Math.abs(dj) === 2 && (!free[cj * nx + i] || !free[j * nx + ci])) continue;   // no cutting a corner
```
=== in Math.abs(di) + Math.abs(dj) === 2. Check that the value is exact by construction; if not, compare within an epsilon. Reviewed: People movement and travel distance.
Against a whole number people-sim.js:143 in field BimCraft
```
if (Math.abs(di) === 2 && (!free[cj * nx + ci + di / 2] || !free[j * nx + ci + di / 2])) continue;   // knight move: both middle cells free
```
=== in Math.abs(di) === 2. Check that the value is exact by construction; if not, compare within an epsilon. Reviewed: People movement and travel distance.
Against a whole number people-sim.js:144 in field BimCraft
```
if (Math.abs(dj) === 2 && (!free[(cj + dj / 2) * nx + ci] || !free[(cj + dj / 2) * nx + i])) continue;
```
=== in Math.abs(dj) === 2. Check that the value is exact by construction; if not, compare within an epsilon. Reviewed: People movement and travel distance.
Against 1 addons/plant/lib/core.js:12 in lookupFrom BimCraft
```
if (s && typeof s === 'object') s = (vars.n !== undefined && s['=' + vars.n]) || (Number(vars.n) === 1 && s.one) || s.other || key;
```
=== in Number(vars.n) === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Not in the register.
Against 1 addons/sprinkler/lib/core.js:12 in lookupFrom BimCraft
```
if (s && typeof s === 'object') s = (vars.n !== undefined && s['=' + vars.n]) || (Number(vars.n) === 1 && s.one) || s.other || key;
```
=== in Number(vars.n) === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Not in the register.
Against 1 render/pt-ggx.js:55 in modulatedEta BimCraft, ModelCraft
```
if (weight === 1) return eta;
```
=== in weight === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: Path tracer kernels.
Against 1 site-context.js:59 in cleanContext BimCraft, ModelCraft, CivilCraft
```
if (!o || typeof o !== 'object' || o.format !== FORMAT || o.v !== 1) return null;
```
!== in o.v !== 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: Site surroundings in local meters.
Against 1 xr/xr-core.js:179 in cleanPeer BimCraft, ModelCraft
```
if (!x || typeof x !== 'object' || x.v !== 1 || !isPose(x.h)) return null;
```
!== in x.v !== 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: Headset review: measuring, section cuts and issue cameras, AR on site: lining the model up with the building.
Against 1 addons/cabinetcraft/lib/core.js:17 in lookupFrom CadCraft, BimCraft, ModelCraft, PartCraft
```
if (s && typeof s === 'object') s = (vars.n !== undefined && s['=' + vars.n]) || (Number(vars.n) === 1 && s.one) || s.other || key;
```
=== in Number(vars.n) === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Not in the register.
Against 1 addons/trusscraft/lib/core.js:12 in lookupFrom CadCraft, BimCraft, ModelCraft, PartCraft
```
if (s && typeof s === 'object') s = (vars.n !== undefined && s['=' + vars.n]) || (Number(vars.n) === 1 && s.one) || s.other || key;
```
=== in Number(vars.n) === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Not in the register.
Against 1 areaclip.js:75 in cleanAreaClip CadCraft, BimCraft, MarkupCraft, DetailCraft
```
if (!d || typeof d !== 'object' || d.format !== AREA_FORMAT || d.v !== 1) return null;
```
!== in d.v !== 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: Size of a copied area.
Against 1 dwg/messages.js:188 in msg CadCraft, BimCraft, ModelCraft, TakeoffCraft, CivilCraft, DetailCraft, PartCraft
```
if (typeof s === 'object') s = s['=' + fills.n] ?? (Number(fills.n) === 1 ? s.one : s.other) ?? s.other;
```
=== in Number(fills.n) === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Not in the register.
Against 1 dwg/objects-write.js:658 in insertScale CadCraft, BimCraft, ModelCraft, TakeoffCraft, CivilCraft
```
if (sx === 1 && sy === 1 && sz === 1) w.BB(3);
```
=== in sx === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: DWG object values written and read.
Against 1 dwg/objects-write.js:658 in insertScale CadCraft, BimCraft, ModelCraft, TakeoffCraft, CivilCraft
```
if (sx === 1 && sy === 1 && sz === 1) w.BB(3);
```
=== in sy === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: DWG object values written and read.
Against 1 dwg/objects-write.js:658 in insertScale CadCraft, BimCraft, ModelCraft, TakeoffCraft, CivilCraft
```
if (sx === 1 && sy === 1 && sz === 1) w.BB(3);
```
=== in sz === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: DWG object values written and read.
Against 1 dwg/objects-write.js:660 in insertScale CadCraft, BimCraft, ModelCraft, TakeoffCraft, CivilCraft
```
else if (sx === 1) { w.BB(1); w.DD(sy, 1); w.DD(sz, 1); }
```
=== in sx === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: DWG object values written and read.
Against 1 dwg/objects-write.js:774 CadCraft, BimCraft, ModelCraft, TakeoffCraft, CivilCraft
```
const weights = ctrl.some((p) => p.w !== undefined && p.w !== 1) || (r.weights || []).some((x) => x !== 1);
```
!== in p.w !== 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: DWG object values written and read.
Against 1 dwg/objects-write.js:818 CadCraft, BimCraft, ModelCraft, TakeoffCraft, CivilCraft
```
const rational = ctl.some((p) => p.w !== undefined && p.w !== 1);
```
!== in p.w !== 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: DWG object values written and read.
Against 1 dxf-model.js:58 in msg CadCraft, BimCraft, TakeoffCraft, CivilCraft
```
if (typeof s === 'object') s = s['=' + fills.n] ?? (Number(fills.n) === 1 ? s.one : s.other) ?? s.other;
```
=== in Number(fills.n) === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: DXF reading into the shared drawing model.
Against 1 libitem.js:233 in msg CadCraft, BimCraft
```
if (typeof s === 'object') s = s['=' + fills.n] ?? (Number(fills.n) === 1 ? s.one : s.other) ?? s.other;
```
=== in Number(fills.n) === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: Library item geometry from blocks, meshes and tables, Lengths and units for Library items.
Against 1 libitem.js:1465 in drawingUnits CadCraft, BimCraft
```
const metric = Number(db.header?.MEASUREMENT) === 1;
```
=== in Number(db.header?.MEASUREMENT) === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: Library item geometry from blocks, meshes and tables, Lengths and units for Library items.
Against 1 live-crypto.js:329 in verifyAssertion CadCraft, BimCraft, ModelCraft, MarkupCraft, TakeoffCraft, CivilCraft, DetailCraft, PartCraft
```
if (!sig || !claims || claims.v !== 1 || typeof claims.name !== 'string') return { ok: false, reason: 'format' };
```
!== in claims.v !== 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Not in the register.
Against 1 process/env/cheminfo.js:182 in groupsOf CadCraft, BimCraft
```
if (arom) inc(a.h === 1 ? 'ring =CH-' : a.h === 0 ? 'ring =C<' : 'ring =CH-');
```
=== in a.h === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: Molar mass and group-contribution estimates.
Against 1 process/env/cheminfo.js:184 in groupsOf CadCraft, BimCraft
```
else if (dbl) { if (nb[i].some((x) => x.order === 2 && mol.atoms[x.o].el !== 'C')) missing.push('carbonyl or C=X carbon'); else if (inRing[i]) missing.push('ring alkene carbon'); else if (dbl === 1 &&
```
=== in a.h === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: Molar mass and group-contribution estimates.
Against 1 process/env/cheminfo.js:185 in groupsOf CadCraft, BimCraft
```
else if (inRing[i]) { if (a.h === 2) inc('ring CH2'); else if (a.h === 1) inc('ring CH'); else missing.push('ring quaternary carbon'); }
```
=== in a.h === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: Molar mass and group-contribution estimates.
Against 1 process/env/cheminfo.js:188 in groupsOf CadCraft, BimCraft
```
if (a.h === 1 && nb[i].length === 1 && !mol.atoms[nb[i][0].o].aromatic) inc('-OH (alcohol)');
```
=== in a.h === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: Molar mass and group-contribution estimates.
Against 1 process/env/molsketch.js:85 in symbol CadCraft, BimCraft
```
return '[' + el + (a.h ? (a.h === 1 ? 'H' : 'H' + a.h) : '') + (q ? (q > 0 ? '+' + (q > 1 ? q : '') : '-' + (q < -1 ? -q : '')) : '') + ']';
```
=== in a.h === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Not in the register.
Against 1 process/live.js:37 in readPacket CadCraft, BimCraft
```
if (!raw || typeof raw !== 'object' || raw.format !== FORMAT || raw.v !== 1) return null;
```
!== in raw.v !== 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Not in the register.
Against 1 process/safety/hazoptimer.js:57 in restore CadCraft, BimCraft
```
if (!s || s.v !== 1 || !Array.isArray(s.rows)) return false;
```
!== in s.v !== 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Not in the register.
Against 1 usd/usda-write.js:40 in subLayersText CadCraft, BimCraft, ModelCraft, TakeoffCraft, CivilCraft, DetailCraft, PartCraft
```
return asset(a) + (o && (o.offset !== 0 || o.scale !== 1) ? ' (' + layerOffsetText(o) + ')' : '');
```
!== in o.scale !== 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: Number text in USD files.
Against 1 usd/usda-write.js:47 in layerOffsetText CadCraft, BimCraft, ModelCraft, TakeoffCraft, CivilCraft, DetailCraft, PartCraft
```
if (o.scale !== 1) parts.push('scale = ' + num(o.scale, 'f64'));
```
!== in o.scale !== 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: Number text in USD files.
Against 1 usd/usda-write.js:172 in listItemText CadCraft, BimCraft, ModelCraft, TakeoffCraft, CivilCraft, DetailCraft, PartCraft
```
if (o && (o.offset !== 0 || o.scale !== 1)) parts.push(layerOffsetText(o));
```
!== in o.scale !== 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: Number text in USD files.
Against 0 assembly-preview.js:11 in assemblyDimensionLayout BimCraft
```
const label=`${i+1}: ${format(l.t)}${l.t===0?' *':''}`,half=Math.min(450,label.length*4+8);
```
=== in l.t===0. Usually fine as a guard against dividing by zero; check it is not meant to catch a near-zero value too. Not in the register.
Against 0 assembly-schedule.js:51 in assemblySchedules BimCraft
```
const designation=cavity?tr('asched.cavity.vent',{vent:l.ventilation}):membrane?(l.t===0?tr('asched.membrane.zero'):tr('asched.membrane.nominal')):tr('asched.material');
```
=== in l.t===0. Usually fine as a guard against dividing by zero; check it is not meant to catch a near-zero value too. Not in the register.
Against 0 framing.js:215 in panelSvg BimCraft, DetailCraft
```
const rise = p.h, run = p.w, left = p.x === 0;
```
=== in p.x === 0. Usually fine as a guard against dividing by zero; check it is not meant to catch a near-zero value too. Reviewed: Framing panels and cut lists.
Against 0 framing.js:324 in placePanel BimCraft, DetailCraft
```
const left = pc.x === 0, n = c + sz.face / 2;
```
=== in pc.x === 0. Usually fine as a guard against dividing by zero; check it is not meant to catch a near-zero value too. Reviewed: Framing panels and cut lists.
Against 0 framing.js:353 in panelPage BimCraft, DetailCraft
```
const left = pc.x === 0;
```
=== in pc.x === 0. Usually fine as a guard against dividing by zero; check it is not meant to catch a near-zero value too. Reviewed: Framing panels and cut lists.
Against 0 ifc/geo-tri.js:133 in clip BimCraft, TakeoffCraft, CivilCraft, DetailCraft
```
if (cross(a, e, c) === 0 && !between(a, e, c)) { remove(e); count--; if (e === stop) stop = c; e = c; if (count < 3) return; continue; }
```
=== in cross(a, e, c) === 0. Usually fine as a guard against dividing by zero; check it is not meant to catch a near-zero value too. Reviewed: Polygon triangulation by ear clipping.
Against 0 ifc/geo-tri.js:145 in clip BimCraft, TakeoffCraft, CivilCraft, DetailCraft
```
while (p.next !== e) { if (cross(e, p, p.next) !== 0) out.push(e.i, p.i, p.next.i); p = p.next; }
```
!== in cross(e, p, p.next) !== 0. Usually fine as a guard against dividing by zero; check it is not meant to catch a near-zero value too. Reviewed: Polygon triangulation by ear clipping.
Against 0 raster.js:118 in openGeoTiff BimCraft, CivilCraft
```
const scale = Number.isFinite(meta.scale) && meta.scale !== 0 ? meta.scale : 1;
```
!== in meta.scale !== 0. Usually fine as a guard against dividing by zero; check it is not meant to catch a near-zero value too. Reviewed: Elevation grids read from GeoTIFF and ASCII files.

Against 0 wall-assemblies-ui.js:51 in totals BimCraft

preview.append(el('div',{style:`position:absolute;box-sizing:border-box;left:${span.start/10}%;width:${(span.end-span.start)/10}%;height:100%;background:${l.kind==='cavity'?'transparent':materialBackg

=== in l.t===0. Usually fine as a guard against dividing by zero; check it is not meant to catch a near-zero value too. Not in the register.