[Godot] CanvasItem light_mask is ignored by LightOccluder2D occluder_light_mask

[joshmossas]

Tested versions

v4.0.alpha14.official

System information

Ubuntu, Nvidia

Issue description

See original issue:
godotengine/godot#64939

This issue has been open since Aug 26, 2022 and has 54 thumbs up from other developers.

From the original poster:

By setting CanvasItem light_mask to a different layer than LightOccluder2D light_mask, it was possible to have shadows not being drawn on top of sprites. This does no longer work.

Especially in topdown games you generally need this to work.

Steps to reproduce

From the original poster:

1. Set your PointLight2D's range_item_cull_mask to cover layer 1 and 2
2. Set your Sprite2D's light_mask to 2 only
3. Add LightOccluder2D that remains on default for occluder_light_mask and light_mask (layer 1)
4. have the LightOccluder2D polygon cover (part of) the sprite
5. hit F6 and note that the shadow is rendered on top of the sprite. the shadow should not be rendered on top of the sprite as is the case in Godot 3.

Minimal reproduction project (MRP)

From the original poster:

projects for both godot 3 and 4 to compare:

light-occluder-sprite-bug.zip

[jawbroken]

why are you reporting real bugs here? the guy who made this fork can't code or fix them. report them to the real project

[joshmossas]

@jawbroken Your comment isn't really productive

Also this bug has been reported on the original repo and it's been open for more than 2 years (I even linked it in the original post).

The devs here said they wanted to fix long standing issues so I'm shedding light on some of those issues. Only time will tell whether the Redot team actually fulfills their promise. However, I figured it'd be good to at least give them the benefit of the doubt and see where the project goes.

[jawbroken]

just trying to help, sorry. you're probably better off reporting it to the fork for anime chomos instead, because at least they worked out how to change the logo

[joshmossas]

Lol is that even a serious project? It looks like a meme.

[jawbroken]

no, and, neither is this one. that's why i was trying to help…

[joshmossas]

I suppose I walked into that one... 😅

Anyway as I said before. I'm giving Redot the benefit of the doubt. Maybe they'll produce a useful fork maybe they won't, but only time will tell.

[jawbroken]

oh…my bad. i didn't realise you incorrectly thought that this was a fork designed to solve issues or be useful in any way. it's actually a grievance-based fork made by, and for, morons who don't have any capability to actually develop a game engine in any way. hope you can get the real project interested in your bugs 🐛

[SkogiB]

Yes, this seems like a totally forgotten issue on Godot. If you find more PRs/issues relating to this, please do link them here.

[joshmossas]

It looks like this has been fixed upstream godotengine/godot#64939 (comment) (relevant PR godotengine/godot#98835)