[Editor] Spotlights imported from GLB have their target reset after page reload

[hybridherbst]

Describe the bug

When importing Spotlights from GLB, their target seems to be reset after page reload, resulting in different lighting / broken scene.

To Reproduce

Steps to reproduce the behavior:

1. Go to https://threejs.org/editor/
2. Import World.zip
3. Note spotlights shining from above
4. Refresh page
5. Note spotlights all shining towards (0,0,0)

Expected behavior

Spotlights still work after page reload

Screenshots

After dropping GLB (and turning physical lighting on)

After page reload

Note: it seems that generally, when creating a spotlight the target can't be moved in the threejs editor. Is this expected? Should I open a separate issue for this?

[Mugen87]

Duplicate of #9508.

There is currently not editor support for the target property of lights.

[hybridherbst]

I see how that relates but I feel "a file breaks in the editor" is a separate issue than "there's no support to move the target around".

[Mugen87]

We use #9508 to track the general lack of support for target light properties (in whatever manifestation) in the editor. Meaning target can't be transformed in the editor and there is no serialization/deserialization support.

[Mugen87]

Notice that it is considered to remove the target property from lights, see #5079. There is also a respective PR, see #14658.

It probably makes sense to solve #5079 first before considering updates to the editor. I hope we get #14658 (comment) in place at some point.

[hybridherbst]

+1 from me for removing "target" and fixing some of the weird behaviours of three in regards to "objects that use their position as rotation" as well ;)