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.
Two computed values ifc/geo-tri.js:55 in ring BimCraft, TakeoffCraft, CivilCraft, DetailCraft
```
if (last && first !== last && last.x === first.x && last.y === first.y) remove(last), (last = last.prev);
```
=== in last.x === first.x. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Polygon triangulation by ear clipping.
Two computed values ifc/geo-tri.js:55 in ring BimCraft, TakeoffCraft, CivilCraft, DetailCraft
```
if (last && first !== last && last.x === first.x && last.y === first.y) remove(last), (last = last.prev);
```
=== in last.y === first.y. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Polygon triangulation by ear clipping.
Two computed values ifc/geo-tri.js:62 in rightmost BimCraft, TakeoffCraft, CivilCraft, DetailCraft
```
function rightmost(n) { let r = n, p = n; do { if (p.x > r.x || (p.x === r.x && p.y < r.y)) r = p; p = p.next; } while (p !== n); return r; }
```
=== in p.x === r.x. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Polygon triangulation by ear clipping.
Two computed values ifc/geo-tri.js:77 in bridgeHole BimCraft, TakeoffCraft, CivilCraft, DetailCraft
```
if (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: Polygon triangulation by ear clipping.
Two computed values ifc/geo-tri.js:92 in bridgeHole BimCraft, TakeoffCraft, CivilCraft, DetailCraft
```
if (inside && !(p.x === m.x && p.y === m.y)) {
```
=== 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 by ear clipping.
Two computed values ifc/geo-tri.js:92 in bridgeHole BimCraft, TakeoffCraft, CivilCraft, DetailCraft
```
if (inside && !(p.x === m.x && p.y === m.y)) {
```
=== in p.y === m.y. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Polygon triangulation by ear clipping.
Two computed values ifc/geo-tri.js:118 in isEar BimCraft, TakeoffCraft, CivilCraft, DetailCraft
```
if (p.i !== a.i && p.i !== b.i && p.i !== c.i && (p.x !== a.x || p.y !== a.y) && (p.x !== c.x || p.y !== c.y) && (p.x !== b.x || p.y !== b.y) && inTri(a, b, c, p) && cross(p.prev, p, p.next) <= 0) ret
```
!== in p.x !== a.x. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Polygon triangulation by ear clipping.
Two computed values ifc/geo-tri.js:118 in isEar BimCraft, TakeoffCraft, CivilCraft, DetailCraft
```
if (p.i !== a.i && p.i !== b.i && p.i !== c.i && (p.x !== a.x || p.y !== a.y) && (p.x !== c.x || p.y !== c.y) && (p.x !== b.x || p.y !== b.y) && inTri(a, b, c, p) && cross(p.prev, p, p.next) <= 0) ret
```
!== in p.y !== a.y. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Polygon triangulation by ear clipping.
Two computed values ifc/geo-tri.js:118 in isEar BimCraft, TakeoffCraft, CivilCraft, DetailCraft
```
if (p.i !== a.i && p.i !== b.i && p.i !== c.i && (p.x !== a.x || p.y !== a.y) && (p.x !== c.x || p.y !== c.y) && (p.x !== b.x || p.y !== b.y) && inTri(a, b, c, p) && cross(p.prev, p, p.next) <= 0) ret
```
!== in p.x !== c.x. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Polygon triangulation by ear clipping.
Two computed values ifc/geo-tri.js:118 in isEar BimCraft, TakeoffCraft, CivilCraft, DetailCraft
```
if (p.i !== a.i && p.i !== b.i && p.i !== c.i && (p.x !== a.x || p.y !== a.y) && (p.x !== c.x || p.y !== c.y) && (p.x !== b.x || p.y !== b.y) && inTri(a, b, c, p) && cross(p.prev, p, p.next) <= 0) ret
```
!== in p.y !== c.y. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Polygon triangulation by ear clipping.
Two computed values ifc/geo-tri.js:118 in isEar BimCraft, TakeoffCraft, CivilCraft, DetailCraft
```
if (p.i !== a.i && p.i !== b.i && p.i !== c.i && (p.x !== a.x || p.y !== a.y) && (p.x !== c.x || p.y !== c.y) && (p.x !== b.x || p.y !== b.y) && inTri(a, b, c, p) && cross(p.prev, p, p.next) <= 0) ret
```
!== in p.x !== b.x. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Polygon triangulation by ear clipping.
Two computed values ifc/geo-tri.js:118 in isEar BimCraft, TakeoffCraft, CivilCraft, DetailCraft
```
if (p.i !== a.i && p.i !== b.i && p.i !== c.i && (p.x !== a.x || p.y !== a.y) && (p.x !== c.x || p.y !== c.y) && (p.x !== b.x || p.y !== b.y) && inTri(a, b, c, p) && cross(p.prev, p, p.next) <= 0) ret
```
!== in p.y !== b.y. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Polygon triangulation by ear clipping.
Two computed values ifc/geo-tri.js:153 in between BimCraft, TakeoffCraft, CivilCraft, DetailCraft
```
if ((a.x === b.x && a.y === b.y) || (c.x === b.x && c.y === b.y)) return false;
```
=== 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: Polygon triangulation by ear clipping.
Two computed values ifc/geo-tri.js:153 in between BimCraft, TakeoffCraft, CivilCraft, DetailCraft
```
if ((a.x === b.x && a.y === b.y) || (c.x === b.x && c.y === b.y)) return false;
```
=== 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: Polygon triangulation by ear clipping.
Two computed values ifc/geo-tri.js:153 in between BimCraft, TakeoffCraft, CivilCraft, DetailCraft
```
if ((a.x === b.x && a.y === b.y) || (c.x === b.x && c.y === b.y)) return false;
```
=== in c.x === b.x. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Polygon triangulation by ear clipping.
Two computed values ifc/geo-tri.js:153 in between BimCraft, TakeoffCraft, CivilCraft, DetailCraft
```
if ((a.x === b.x && a.y === b.y) || (c.x === b.x && c.y === b.y)) return false;
```
=== in c.y === b.y. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Polygon triangulation by ear clipping.
Two computed values raster.js:171 in openAsc BimCraft, CivilCraft
```
gt: [h.xll, h.dx, 0, h.yll + h.nrows * h.dy, 0, -h.dy], pixelIsPoint: false, cell: h.dx === h.dy ? h.dx : null,
```
=== in h.dx === h.dy. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Elevation grids read from GeoTIFF and ASCII files.
Two computed values dwg/objects-write.js:659 in insertScale CadCraft, BimCraft, ModelCraft, TakeoffCraft, CivilCraft
```
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. Reviewed: DWG object values written and read.
Two computed values dwg/objects-write.js:659 in insertScale CadCraft, BimCraft, ModelCraft, TakeoffCraft, CivilCraft
```
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. Reviewed: DWG object values written and read.
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 geotech.js:230 in interp CivilCraft
```
return b.x === a.x ? b.z : a.z + ((x - a.x) / (b.x - a.x)) * (b.z - a.z);
```
=== in b.x === a.x. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Boring logs and the soil profile between borings, Slope stability, Foundation settlement.
Two computed values ground-surface.js:69 in closedPts CivilCraft
```
const closedPts = (l) => (l.closed && l.pts.length > 2 && (l.pts[0].x !== l.pts[l.pts.length - 1].x || l.pts[0].y !== l.pts[l.pts.length - 1].y) ? [...l.pts, l.pts[0]] : l.pts);
```
!== in l.pts[0].x !== l.pts[l.pts.length - 1].x. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Ground surface from contour lines and points.
Two computed values ground-surface.js:69 in closedPts CivilCraft
```
const closedPts = (l) => (l.closed && l.pts.length > 2 && (l.pts[0].x !== l.pts[l.pts.length - 1].x || l.pts[0].y !== l.pts[l.pts.length - 1].y) ? [...l.pts, l.pts[0]] : l.pts);
```
!== in l.pts[0].y !== l.pts[l.pts.length - 1].y. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Ground surface from contour lines and points.
Two computed values platform.js:123 in cleanSectionLines CivilCraft
```
if (line.length < 2 || line.every((p) => p.x === line[0].x && p.y === line[0].y)) return null;
```
=== in p.x === line[0].x. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Cut and fill map, spot levels, sloped pads and free sections.
Two computed values platform.js:123 in cleanSectionLines CivilCraft
```
if (line.length < 2 || line.every((p) => p.x === line[0].x && p.y === line[0].y)) return null;
```
=== in p.y === line[0].y. Compare within a documented epsilon scaled to the size of the geometry, or restructure so one side is exact. Reviewed: Cut and fill map, spot levels, sloped pads and free sections.
Two computed values point-edit.js:59 in checkPointEdit CivilCraft
```
if (next.n === old.n && next.x === old.x && next.y === old.y && next.z === old.z && (next.d || '') === (old.d || '')) return { ok: false, errors: {}, message: '' };
```
=== in next.x === old.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 point-edit.js:59 in checkPointEdit CivilCraft
```
if (next.n === old.n && next.x === old.x && next.y === old.y && next.z === old.z && (next.d || '') === (old.d || '')) return { ok: false, errors: {}, message: '' };
```
=== in next.y === old.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 point-edit.js:59 in checkPointEdit CivilCraft
```
if (next.n === old.n && next.x === old.x && next.y === old.y && next.z === old.z && (next.d || '') === (old.d || '')) return { ok: false, errors: {}, message: '' };
```
=== in next.z === old.z. 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 point-edit.js:68 in editPoint CivilCraft
```
const moved = point.x !== old.x || point.y !== old.y || point.z !== old.z;
```
!== in point.x !== old.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 point-edit.js:68 in editPoint CivilCraft
```
const moved = point.x !== old.x || point.y !== old.y || point.z !== old.z;
```
!== in point.y !== old.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 point-edit.js:68 in editPoint CivilCraft
```
const moved = point.x !== old.x || point.y !== old.y || point.z !== old.z;
```
!== in point.z !== old.z. 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 point-edit.js:74 in editPoint CivilCraft
```
if (v.x !== old.x || v.y !== old.y) continue;
```
!== in v.x !== old.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 point-edit.js:74 in editPoint CivilCraft
```
if (v.x !== old.x || v.y !== old.y) continue;
```
!== in v.y !== old.y. 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 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 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.