CesiumGS/cesium

Primitive with heightReference have a wrong positioning in 2D mode

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#12,531 opened on 2025年3月20日

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 (4 comments) (1 reaction) (1 assignee)JavaScript (11,758 stars) (3,324 forks)batch import
good first issueonrampingtype - bug

説明

What happened?

Hello!

I use Cesium version 1.127.0. When a primitive has a heightReference other than NONE, its position on map is wrong in 2D mode. In 3D or without the heightReference, the primitive is placed properly.

If the primitive is displayed at lattitude longitude [0, 0], it is correctly placed.

Thank you for your help!

Sandcastle with option to add a point with a heightReference set to CLAMP_TO_GROUND

Reproduction steps

  1. Add two primitives (point or billboard) with and without a heightReference different than NONE
  2. Set the map in 2D mode
  3. The two primitives are not placed at the same position on map

Sandcastle example

https://sandcastle.cesium.com/#c=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

Environment

Browser: Chrome and Edge CesiumJS Version: 1.127.0 Operating System: Window 10 and 11

コントリビューターガイド

技術スタック
javascript
領域
frontend
Issue 種別
bug
難度新しい貢献者にとっての実装難度です。1 は非常に小さな変更、5 は専門的な作業です。
3
推定時間経験ある貢献者が調査、実装、テスト、pull request 準備にかけるおおよその時間範囲です。
1-2 days
活動状況Issue が今どれだけ取り組みやすいかを示します。新しい、活発、古い、ブロック中、またはメンテナー入力待ちなどです。
blocked
明確さ期待される変更、受け入れ条件、次の手順がどれだけ明確かを示します。
clear
前提条件
JavaScriptCesiumJS basicsCoordinate transformation
初心者向け度初回貢献者にどれだけ取り組みやすいかを 1-100 で推定したスコアです。
35
調査方針
The bug appears when primitives with heightReference other than NONE are displayed in 2D mode; they are mispositioned. Investigate how CesiumJS applies height offsets in 2D versus 3D rendering. The Sandcastle example can be used to reproduce. Likely the issue is in the transformation pipeline for 2D mode, possibly near the Cartesian to screen coordinate conversion. Check the Primitive class and related shader code. Since the issue is assigned, the assignee may already have insights.