mapbox / mapbox/mapbox-gl-js

Extrusions that originate behind the horizon are clipped too early

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3d :triangular_ruler: bug :lady_beetle:
Dominant language
TypeScript
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Description

It's much more pronounced when high levels of exagerration are used, but occurs even without it.

**mapbox-gl-js version**: 2.9.1

**browser**: Firefox 101.0.1

### Steps to Trigger Behavior

1. Login to [Studio](https://studio.mapbox.com)
1. Create a new style (with `globe` projection by default)
1. `3D -> 3D Terrain -> Enable terrain -> On`
1. `3D -> 3D Terrain -> Exagerration -> 1000`
1. Zoom out and spin the globe for a bit
1. Notice that mountains on the edges of the globe are flickering

### Link to Demonstration

[Shared style](https://api.mapbox.com/styles/v1/testy-user/cl4rd3chd000u15lk13a6sg0e.html?title=view&access_token=pk.eyJ1IjoidGVzdHktdXNlciIsImEiOiJjbDRyZDMyOTQwNTNzM2NvNjF3dmc1dGNmIn0.sRrT87LpCL7kd6XivEnkxg&zoomwheel=true&fresh=true#3.2/61.25/-16.01)

https://user-images.githubusercontent.com/2198527/175379360-15a695b6-49a4-4baf-b7d3-a28c2def0cb5.mp4

### Expected Behavior

Mountains on the edges of the map are visible

### Actual Behavior

Mountains on the edges of the globe disappear

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

No source file or test is named. Reproduce the linked shared style in Studio using globe projection, terrain, high exaggeration, and zoomed-out rotation, then trace the globe terrain rendering and clipping behavior. Done means mountains near the globe's edges remain visible without flickering.

Written by the indexing model from the issue text.

Assessment

Tech stack
javascript, typescript
Domain
computer-graphics, web-dev
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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