Here is the example: Cesium Sandcastle
Description: As in the example, In 2D mode, I draw a polyline near the North pole and set the arcType ArcType.NONE because the polyline should be straight, but it seems to vary in thickness.
Here is the screenshot:
Looks like the issue is also present in 3D mode! I’ll update with anything else I find…
This feels like it might be an offshoot of this issue. If I move the last point of the polyline so that the angle made is larger, the width issue is definitely mitigated. Though there does appear to be an additional issue (in 2D mode) - not with the width of the line, but with shape made by the vertices of the 2nd point… they make more of a trapezoid than a rectangle at high altitudes.
I’ll leave a comment on the issue referencing this post. I think we have some interest in improving the 2D experience as whole in the future.