Browser preview is not working correctly

[MassiveM]

Hi, I’m testing Cocos Creator and hit a problem with any built-in 3D object (Cube, Sphere, Plane, etc.).

• Version: 3.8.6
• OS: Windows 10
• Pipeline: I am using Legacy (builtin-forward.rpp). If I leave “Render Pipeline (new)” selected, I get other errors, so I switched to Legacy!
• Steps to reproduce:
  1. Create a new empty project.
  2. Add a 3D Object → Cube (or any other primitive).
  3. Preview the scene in browser.
• Result: Preview fails and I see errors like:

the native asset of <uuid>@xxxx is missing!
RangeError: Invalid typed array length: ...
MeshRenderer._updateModelParams ...

This happens for every 3D primitive I try to add. I did not import any external models!

• What I tried:
  • Deleted temp/, library/, and local/ folders to force re-import.
  • Developer → Refresh All Effect.
  • Reinstalled Cocos Creator.
    Still the same issue.

Question:
Why are the built-in 3D primitives failing to load their mesh data? Is this a known issue in? Is there a way to regenerate or repair the missing native assets?

Btw, the 3D models will be rendered in “Preview in Simulator” but not in “Preview in Browser”

Thanks!

[MassiveM]

Here’s a screenshot of the error in the browser console when I add a built-in 3D object and preview

[Tom_k]

After Render Pipeline switch, have you reopen the project?

[Tom_k]

I test the steps you told, but I cant regenerate the error you have encountered. Pls have a try to delete the folder under path ‘C:\Users\xxxxx.Cocos’.

[MassiveM]

Thanks for your reply. I don’t know why, but it turned out I had to remove Internet Download Manager (IDM) from my PC for the Cocos preview in the browser to work properly. After uninstalling it, everything worked fine.

[Tom_k]

That is Great.