Directional Shadows disappear with large Camera Z Far values at some angles #89560
Description
Tested versions
- Reproducible in: v4.3.dev5.official [89f70e9]
- Not Reproducible in: v4.3.dev2.official [3524346], v4.2.1.stable.mono.official [b09f793]
System information
Godot v4.3.dev5 - Windows 10.0.19045 - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 3060 Ti (NVIDIA; 31.0.15.3623) - AMD Ryzen 7 2700 Eight-Core Processor (16 Threads)
Issue description
When I set the camera's Z Near to 10m and Z Far to 1,000,000m, shadows from a directional light begin to disappear at certain angles. Reducing the Z Far value to 100,000m resolves the issue. The ratio between the near and far planes is not significantly different from the default values (4000 / 0.05 = 80,000, compared to 1,000,000 / 10 = 100,000), so I think that the problem is unlikely to be related to Z fighting or similar issues.
Small Z Far value:
Large Z Far value:
Steps to reproduce
In the MRP, toggle the preview between Camera3D_Ok and Camera3D_Error to observe the disappearance of shadows. Additionally, you can adjust the editor camera settings to match those of Camera3D_Error and rotate it to identify angles at which the shadows fail.