Strange shadow issues #20878
Description
Bevy version and features
- Bevy 0.16.1
- Features:
- animation
- bevy_asset
- bevy_color
- bevy_core_pipeline
- bevy_gilrs
- bevy_gizmos
- bevy_gltf
- bevy_mesh_picking_backend
- bevy_pbr
- bevy_picking
- bevy_render
- bevy_scene
- bevy_state
- bevy_text
- bevy_ui
- bevy_ui_picking_backend
- bevy_window
- bevy_winit
- custom_cursor
- default_font
- hdr
- multi_threaded
- png
- smaa_luts
- sysinfo_plugin
- tonemapping_luts
- webgl2
- x11
Relevant system information
- cargo 1.89.0 (c24e10642 2025-06-23)
- Linux, NixOS 25.11 (Xantusia) x86_64, Wayland
`AdapterInfo { name: "AMD Radeon RX 7900 XTX (RADV NAVI31)", vendor: 4098, device: 29772, device_type: DiscreteGpu, driver: "radv", driver_info: "Mesa 25.2.1", backend: Vulkan }`
What you did
Updating to Bevy 0.16 has caused many weird defects around shadows. I've seen a few other issues around this, but none that are quite the same.
What went wrong
I have tried to create a minimal, reproducible example, but sadly have failed. All the examples I have tried work fine, and I've not easily been able to strip away enough of my program to be considered minimal, but I can go further down this path if it would be helpful. You can also view my full project here (run with cargo run --bin client).
In this image, you can see a very large shadow under the laser sight, which has both NotShadowCaster and NotShadowReceiver. This shadow is not always present:
In this image, you can see the previous shadow is gone, but there's a similar shadow for the dot, which also has NotShadowCaster and NotShadowReceiver. There are also some shadow defects on the floor, to the left of it:
In this video, you can see the above, and also the flickering: