fix: sdk billboard ignoring virtual cameras

[pravusjif]

WHY

Currently if a scene uses a VirtualCamera (setting it as active in the MainCamera component), when that camera starts being the main active one, the entities with Billboard component still point towards the player camera, that is not the main active one...

WHAT

Corrected billboard system logic to always use the active camera data instead of the player camera data.

TEST INSTRUCTIONS

1. Download this test scene and extract it somewhere
2. In the scene root folder open a terminal and run npm i and then npm run start
3. Close the Explorer that auto-opened. Leave the scene running in the console/terminal.
4. Download the build from this PR and open it connected to the local scene (keep in mind its position is 0,0): https://github.com/decentraland/unity-explorer/wiki/How-to-connect-to-a-local-scene-(Unity-Editor---Custom-Build---Latest-Released-Build)#connecting-a-custom-build-to-the-scene
5. Once you enter the scene confirm that:

• The blue plane in the center of the screen always faces the Player Camera
• After you click the cube on the ground, a Virtual Camera is activated on the Flying cube in the sky, and it constantly looks at the blue plane in the center of the scene
• The blue plane at the center of the scene always faces the Virtual camera

[github-actions]

Windows and Mac build successful in Unity Cloud! You can find a link to the downloadable artifact below.

Name	Link
Commit	54cc241
Logs	https://github.com/decentraland/unity-explorer/actions/runs/22384532738
Download Windows	https://github.com/decentraland/unity-explorer/suites/58481914257/artifacts/5648831744
Download Windows S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/fix/sdk-billboard-ignoring-vcams/pr-19087-54cc241/Decentraland_windows64.zip
Download Mac	https://github.com/decentraland/unity-explorer/suites/58481914257/artifacts/5648798666
Download Mac S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/fix/sdk-billboard-ignoring-vcams/pr-19087-54cc241/Decentraland_macos.zip
Built on	2026-02-25T06:45:24Z

Artifact size check

Target	Size (MB / MiB)	Cap (MB)	Δ MB vs release	Δ % vs release	Result
windows64	317.8 / 303.1	320	0	-0.06%	✅ OK
macos	406.0 / 387.2	410	-2	-0.49%	✅ OK

Comparing against: v0.126.0-alpha

[fcolarich]

Nice!

[Ludmilafantaniella]

LGTM 👍
✅ Verified on Windows and Mac using the provided test scene.
QA validation performed:

• Blue plane correctly faces the Player Camera initially
• After activating the Virtual Camera, billboard updates to use the active camera
• Blue plane consistently faces the Virtual Camera when it becomes active
• Blue panel correctly faces camera [C] when active
• No regressions observed during testing

Status: Approved for merge 🚀

6756-evi.mp4

✅Smoke test performed:

• ✔️ Backpack and wearables in world
• ✔️ Emotes in world and in backpack
• ✔️ Teleport with map/coordinates/Jump In
  • Metadynelabs
  • Art week scenes
  • Genesis City
• ✔️ Chat and multiplayer
• ✔️ Profile card
• ✔️ Camera