Crash in BezierSpline3D -> getProgressProperties

[natalia-osa]

The code crashed in line 58, which is:

let spineSegmentStartIndex: Int = min(Int(absoluteProgress), curvePoints.count - 2 - pad * 2) // Integer time for the index of the starting curvePoint

absoluteProgress is NaN, curvePoints.count is 4, pad is 1.

Unfortunately, I'm not sure why absoluteProgress isn't a number. However, at the moment, it is happening in 100% cases I'm trying to render a route.

[natalia-osa]

Ok, so if in init of PolylineNode sampleCount == 1, then when creating geometry of PolylineShader in render func it tries to create positions in

for index in (0..<sampleCount).reversed() {
  let position = polyline.getPositon(atProgress: progressAtSample(index))
  addCap(atPosition: position, withIndex: index)
}

So it iterates from 0 to 0. It tries to progressAtSample with parameter 0. This methods looks like this:

private func progressAtSample(_ sample: Int) -> CGFloat {
  return (CGFloat(sample) / CGFloat(sampleCount - 1))
}

So it tries to return 0 / 0.

[natalia-osa]

The crash is also sometimes reproducible also in your demo. Just add polyline drawing to AR component and it will crash.

In the demo it crashed in these lines, but it may be the same issue. Previously code was working fine, recent changes in master broke it.

ImageBuilder.swift:

func addTile(x: Int, y: Int, image: UIImage) {
    context?.draw(image.cgImage!, in: CGRect(origin: CGPoint(x: CGFloat(x) * tileSize.width, y: CGFloat(Int(imageSize.height / tileSize.height) - y - 1) * tileSize.height), size: tileSize)) // crash Thread 24: EXC_BAD_ACCESS (code=1, address=0x118b84000)
}