icon flip in custom polyline material
- Dominant language
- JavaScript
- Stars
- 15.8k
- Forks
- 3.9k
- Avg merge
- 4d 6h
- Merged PRs (30d)
- 34
Description
Recently, I have a thorny problem. I create a custom polyline material using icon. Unfortunately, when I am zooming, pitching and rotating the map in 3D mode. The icon flips when the camera is very close to the earth surface.

zoom and the polyline icon filp

**Someone can tell me how to fix it !!!**
Sandcastle example:
https://sandcastle.cesium.com/#c=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
Browser:
chrome 90
Operating System:
macOS 10.15.5
Contributor guide
Research direction
Start by running the linked Sandcastle example in Chrome and reproduce the icon flip while zooming, pitching, and rotating near the earth surface in 3D mode. Trace the custom polyline material and its rendering behavior, then verify that the icon remains correctly oriented during those camera movements.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- javascript
- Domain
- computer-graphics
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Active
- Clarity
- Mostly clear
- Newbie friendliness
- 52/100