remove absolute value calculations

this gave bad averageScales when the point and origin where on different sides of the equator.

src/api/coords-to-vector-3.ts

@@ -35,11 +35,8 @@ export function coordsToVector3(point: Coords, origin: Coords): Vector3Tuple {
  // dynamic step size based on latitude difference. calculate the mercator unit scale at origin
  // and the scale average along the line to the point for better accuracy far from origin
  const steps = Math.ceil(Math.abs(point.latitude - origin.latitude)) * 100 + 1;
- const absOriginLat = Math.abs(origin.latitude); // use abs values for scale calculation (same scale for north and south)
- const absPointLat = Math.abs(point.latitude);
- const avgScale = averageMercatorScale(absOriginLat, absPointLat, steps);
-
- const z = (zOld / getMercatorScale(absOriginLat)) * avgScale;
+ const avgScale = averageMercatorScale(origin.latitude, point.latitude, steps);
 
+ const z = (zOld / getMercatorScale(origin.latitude)) * avgScale;
  return [x, y, z] as Vector3Tuple;
 }