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Original file line number Diff line number Diff line change
Expand Up @@ -171,6 +171,7 @@ const reTesselateCoplanarPolygons = (sourcepolygons) => {
// update activepolygons by adding any polygons that start here:
const startingpolygonindexes = topy2polygonindexes.get(ycoordinate)
for (const polygonindexKey in startingpolygonindexes) {
if(isNaN(polygonindexKey)) continue
const polygonindex = startingpolygonindexes[polygonindexKey]
const vertices2d = polygonvertices2d[polygonindex]
const numvertices = vertices2d.length
Expand Down Expand Up @@ -219,6 +220,7 @@ const reTesselateCoplanarPolygons = (sourcepolygons) => {
// Now activepolygons is up to date
// Build the output polygons for the next row in newoutpolygonrow:
for (const activepolygonKey in activepolygons) {
if(isNaN(activepolygonKey)) continue
const activepolygon = activepolygons[activepolygonKey]

let x = interpolateBetween2DPointsForY(activepolygon.topleft, activepolygon.bottomleft, ycoordinate)
Expand Down
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