Wierd shadow using directional light

[TandersT]

Godot version

Godot Engine v4.0.beta7.mono.official.01ae26d31

System information

AMD Radeon RX 5700

Issue description

When updating from v4.0.beta3 to v4.0.beta7 the shadows produced by the directional light looks very funky. This was not the case before, hence something I believe to have been introduced in recent betas. I believe any use of shadow with directional light seem to cause this issue.

Steps to reproduce

Create a directional light, enable shadow and have a mesh produce shadow on another mesh.

Minimal reproduction project

RenderIssues.zip

[Calinou]

This is expected as a result of #68339. You need to tweak your directional shadow bias values accordingly. You'll need to increase Shadow > Bias and/or Shadow > Normal Bias, and find a value that resolves shadow acne without introducing too much peter-panning.

I suggest increasing Shadow Normal Bias to 2 for starters. See also #55757.

PS: You can probably decrease Directional Shadow Max Distance to improve shadow quality, since your camera can't see far away given its angle.