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.

Against a decimal usd/util.js:60 in floatToHalf CadCraft, BimCraft, ModelCraft, TakeoffCraft, CivilCraft, DetailCraft, PartCraft
```
return sign | (rest > 0.5 || (rest === 0.5 && (r & 1)) ? r + 1 : r);
```
=== in rest === 0.5. Compare within a documented epsilon, or test with < or > if a range is meant. Reviewed: Half floats in USD.
Against a decimal cs-tensor.js:60 in pow PartCraft
```
if (y === 0.5) return Math.sqrt(x);
```
=== in y === 0.5. Compare within a documented epsilon, or test with < or > if a range is meant. Reviewed: CraftScript array arithmetic.

Against a decimal field/lattice.js:23 PartCraft

for (let i = 0; i < 6; i++) for (let j = i + 1; j < 6; j++) { const d2 = (faces[i][0] - faces[j][0]) ** 2 + (faces[i][1] - faces[j][1]) ** 2 + (faces[i][2] - faces[j][2]) ** 2; if (d2 === 0.5) out.pus

=== in d2 === 0.5. Compare within a documented epsilon, or test with < or > if a range is meant. Reviewed: Voxel grid and lattice struts.

Two computed values addons/cabinetcraft/lib/cutlist/cutlist.js:86 in sameKind CadCraft, BimCraft, ModelCraft, PartCraft
```
const sameKind = (a, b) => a.material === b.material && a.thickness === b.thickness && a.length === b.length && a.width === b.width &&
```
=== in a.thickness === b.thickness. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Cut list sizes, areas and banding lengths.
Two computed values addons/cabinetcraft/lib/cutlist/cutlist.js:86 in sameKind CadCraft, BimCraft, ModelCraft, PartCraft
```
const sameKind = (a, b) => a.material === b.material && a.thickness === b.thickness && a.length === b.length && a.width === b.width &&
```
=== in a.width === b.width. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Cut list sizes, areas and banding lengths.
Two computed values addons/cabinetcraft/lib/draw.js:29 in planEnts CadCraft, BimCraft, ModelCraft, PartCraft
```
for (const f of frontsOf(cab, R).filter((g, i, a) => a.findIndex((h) => h.x === g.x) === i)) out.push(rect(f.x * k, D, f.w * k, F));
```
=== in h.x === g.x. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Cabinet plan, elevation, section and 3D boxes.
Two computed values addons/cabinetcraft/lib/estimate.js:140 in sheetsFor CadCraft, BimCraft, ModelCraft, PartCraft
```
const m = nestJob && nestJob.mats.find((x) => x.material === g.material && x.thickness === g.thickness);
```
=== in x.thickness === g.thickness. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Cabinet job cost estimate.
Two computed values dwg/table-write.js:71 in insertScale CadCraft, ModelCraft, CivilCraft, DetailCraft, PartCraft
```
else if (sx === sy && sx === sz) { w.BB(2); w.RD(sx); }
```
=== in sx === sy. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Not in the register.
Two computed values dwg/table-write.js:71 in insertScale CadCraft, ModelCraft, CivilCraft, DetailCraft, PartCraft
```
else if (sx === sy && sx === sz) { w.BB(2); w.RD(sx); }
```
=== in sx === sz. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Not in the register.
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.
Two computed values dwg/objects-write.js:659 in insertScale DetailCraft, PartCraft
```
else if (sx === sy && sx === sz) { w.BB(2); w.RD(sx); }
```
=== in sx === sy. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Not in the register.
Two computed values dwg/objects-write.js:659 in insertScale DetailCraft, PartCraft
```
else if (sx === sy && sx === sz) { w.BB(2); w.RD(sx); }
```
=== in sx === sz. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Not in the register.
Two computed values nurbs/trim.js:163 in sameXY ModelCraft, PartCraft
```
const sameXY = (a, b) => a.x === b.x && a.y === b.y;
```
=== in a.x === b.x. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Trimmed surfaces: loops, cut tessellation and area.
Two computed values nurbs/trim.js:163 in sameXY ModelCraft, PartCraft
```
const sameXY = (a, b) => a.x === b.x && a.y === b.y;
```
=== in a.y === b.y. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Trimmed surfaces: loops, cut tessellation and area.
Two computed values nurbs/trim.js:209 in triangulate ModelCraft, PartCraft
```
if ((a.y > M.y) === (b.y > M.y) && !(a.y === M.y || b.y === M.y)) continue;
```
=== in a.y === M.y. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Trimmed surfaces: loops, cut tessellation and area.
Two computed values nurbs/trim.js:209 in triangulate ModelCraft, PartCraft
```
if ((a.y > M.y) === (b.y > M.y) && !(a.y === M.y || b.y === M.y)) continue;
```
=== in b.y === M.y. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Trimmed surfaces: loops, cut tessellation and area.
Two computed values nurbs/trim.js:210 in triangulate ModelCraft, PartCraft
```
if (a.y === b.y) continue;
```
=== in a.y === b.y. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Trimmed surfaces: loops, cut tessellation and area.
Two computed values 3dm/earcut.js:162 in findHoleBridge 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. Not in the register.
Two computed values 3dm/earcut.js:180 in findHoleBridge 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. Not in the register.
Two computed values 3dm/earcut.js:195 in getLeftmost 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. Not in the register.
Two computed values 3dm/earcut.js:218 in equals 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. Not in the register.
Two computed values 3dm/earcut.js:218 in equals 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. Not in the register.
Two computed values 3dm/earcut.js:248 in middleInside 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. Not in the register.
Two computed values contact.js:159 in pairAll PartCraft
```
if (!old || old.t !== best.t || Math.abs(old.L1 - best.L1) > 2e-3 || Math.abs(old.L2 - best.L2) > 2e-3) moved = true;
```
!== in old.t !== best.t. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Contact between parts in stress analysis.
Two computed values illustrate/anim.js:129 in sortKeys PartCraft
```
for (const k of keys) { if (out.length && out[out.length - 1].t === k.t) out[out.length - 1] = k; else out.push(k); }
```
=== in out[out.length - 1].t === k.t. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Not in the register.
Two computed values illustrate/anim.js:467 in moveKeys PartCraft
```
for (const k of x.keys) { const last = out[out.length - 1]; if (last && last.t === k.t) { if (moved.has(k) || !moved.has(last)) out[out.length - 1] = k; } else out.push(k); }
```
=== in last.t === k.t. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Not in the register.
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 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/table-write.js:70 in insertScale CadCraft, ModelCraft, CivilCraft, DetailCraft, PartCraft
```
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. Not in the register.
Against 1 dwg/table-write.js:70 in insertScale CadCraft, ModelCraft, CivilCraft, DetailCraft, PartCraft
```
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. Not in the register.
Against 1 dwg/table-write.js:70 in insertScale CadCraft, ModelCraft, CivilCraft, DetailCraft, PartCraft
```
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. Not in the register.
Against 1 dwg/table-write.js:72 in insertScale CadCraft, ModelCraft, CivilCraft, DetailCraft, PartCraft
```
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. Not in the register.
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 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 1 dwg/objects-write.js:658 in insertScale DetailCraft, PartCraft
```
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. Not in the register.
Against 1 dwg/objects-write.js:658 in insertScale DetailCraft, PartCraft
```
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. Not in the register.
Against 1 dwg/objects-write.js:658 in insertScale DetailCraft, PartCraft
```
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. Not in the register.
Against 1 dwg/objects-write.js:660 in insertScale DetailCraft, PartCraft
```
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. Not in the register.
Against 1 dwg/objects-write.js:774 DetailCraft, PartCraft
```
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. Not in the register.
Against 1 dwg/objects-write.js:818 DetailCraft, PartCraft
```
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. Not in the register.