fix: local scene dev reload memory leak

[pravusjif]

WHY

During Local Sccene Development mode, RAW GLTFs are being used instead of asset bundles. With every SDK scene code change or file change, the scene gets automatically reloaded (known as "hot-reload")

It has been detected that GLTF textures are not being disposed at all when the scene is reloading, infinitely accumulating in memory, potentially making the app crash or the hot reload unreliable

Issue: decentraland/creator-hub#271

WHAT

• Fixed GLTFData not being disposed of correctly
• Improved cache and unreferenced assets unload during LocalSceneDevelopment scene reload

TEST INSTRUCTIONS

1. Download this test scene
2. Enter the scene root folder and run npm i and then npm run start -- --explorer-alpha
3. Close the Explorer that auto-opened. Leave the scene running in the console/terminal.
4. Download the build from this PR and connect it to the running scene using the console command according to your OS
5. Once the scene loads, open the "Memory" section of the Debug Panel and keep it in sight, take note of the approximate value you see in "system used memory" for that 1st scene load.
6. Run the "/reload" chat command in the chat window and confirm that the scene is reloaded
7. Do 10 more reloads, and confirm that after the last one, your memory hasn't increased more than 500MB (maybe it increased even less) since the 1st scene load memory value, making it a lot more stable.

Note: It's OK if you see the chat message saying "Error running command." that's an unrelated (inoffensive) problem

VIDEO COMPARISON DEMO

PROD:

After 11 scene reloads (without changing anything on the scene) the memory is almost doubled.

LSD-memory-lead-PROD.mp4

THIS PR:

After 11 scene reloads (without changing anything on the scene) the memory is kept pretty stable, only increasing a total of about 300~ MBs and never surpassing that.

LSD-memory-lead-FIX.mp4

[github-actions]

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

Name	Link
Commit	4088728
Logs	https://github.com/decentraland/unity-explorer/actions/runs/13898768650
Download Windows	https://github.com/decentraland/unity-explorer/suites/35783149394/artifacts/2764278181
Download Windows S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/fix/local-scene-dev-reload-memory-leak/Decentraland_windows64.zip
Download Mac	https://github.com/decentraland/unity-explorer/suites/35783149394/artifacts/2764267464
Download Mac S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/fix/local-scene-dev-reload-memory-leak/Decentraland_macos.zip
Built on	2025-03-17T12:22:33Z

[pravusjif]

Up to this point (c9cf4a6), now that GLTF textures are being cleaned up correctly they are not longer leaking but I've detected GLTF materials are still leaking (185~ added on every reload, they never get disposed...):

[pravusjif]

With 0eba597 commit I clean up the leaked materials on LSD reload:

[pravusjif]

There appears to still be a small leak on reloads but unrelated to Local Scene Development:

[popuz]

Nice cleanup 👍

[anicalbano]

✔️ PR reviewed and approved by QA. Didn't find any issues while reloading the scenes and the memory remained stable with no significant increments.

17.03.2025_08.53.26_REC.mp4

[pravusjif]

Sorry Ani, can you re-check with this other scene?
https://github.com/decentraland/sdk7-test-scenes/tree/main/scenes/54%2C-55-Testing-3d-models

I just updated the original description, my bad =S

[anicalbano]

@pravusjif all good with that scene too!

17.03.2025_09.35.29_REC.mp4