Vulkan Mobile: LightmapGI dynamic object lighting results in black objects

[SpockBauru]

Godot version

v4.1.3.stable.official [f06b6836a] and v4.2.beta5.official [4c96e96]

System information

Godot v4.1.3.stable and Godot v4.2.beta5 - Windows 10.0.22621 - Vulkan (Mobile) - dedicated NVIDIA GeForce RTX 3080 (NVIDIA; 31.0.15.2849) - 12th Gen Intel(R) Core(TM) i7-12700KF (20 Threads)

Issue description

Hey guys, Seems like LightmapProbes are not working on Mobile renderer. They work well on Forward+ but not in Mobile.

LightMapProbes_Bug_edit.mp4

I've already:

• Tested on both Godot 4.1.3 and 4.2 beta 5.
  • Lightmaps don't work on Godot 4.1.2 on Mobile Renderer, but works in 4.2 beta 5. Light Probes don't work with Mobile Renderer on both.
• Set up lightmap UVs.
• Marked static and dynamic objects and lights.
• Set up all kinds of World Environment settings, even tried to delete and disable it.
  • In this node, the Background mode Sky have issues on Mobile, so I set up to Custom Color (seems related to Vulkan Mobile backend: LightmapGI baking does not take environment lighting into account #55868 (comment))
• Baked LightmapGI on both Forward+ and Mobile:
• Tried many combinations on the LightmapGI node.
• Tried a brand new project, now even the Lightmaps stopped working on Godot 4.1.2 (Still working on 4.2 beta 5)...
• Yes, I restarted my PC.
• Deleted all Godot config files in AppData\Local and AppData\Roaming

Steps to reproduce

Bake a scene with LightmapGI and an object that transition between different lighting conditions. The Probes will work on Forward+ but not on Mobile.

Minimal reproduction project

LightmapProbes_Test.zip

Edit: MRP for Godot 4.3.dev6
Lightmap_Test_4.3.dev6.zip

[KarthikHebbarMN]

+1

Still can confirm this bug happening in Godot 4.2.1 on Ubuntu

[Lasuch69]

Godot v4.3.dev6 - Fedora Linux 39.20240423.0 (Silverblue) - Wayland - Vulkan (Mobile) - dedicated AMD Radeon RX 550 / 550 Series (RADV POLARIS12) () - AMD Ryzen 5 3400G with Radeon Vega Graphics (8 Threads)

[Swarkin]

Same issue as OP
Godot v4.3.dev6 - Windows 10.0.19044 - Vulkan (Mobile) - dedicated AMD Radeon RX 6700 XT (Advanced Micro Devices, Inc.; 31.0.24027.1012) - Intel(R) Core(TM) i5-9600K CPU @ 3.70GHz (6 Threads)

[Lasuch69]

Baking the lightmaps myself results in visual difference:

[SpockBauru]

Edited the first comment to include the MRP I sent to Lasuch69 and Swarkin on Discord.