Transparent Material not casting shadows

Questions & Answers
1

Hello,
I recently upgraded a project from SRP to URP but now transparent objects no longer cast shadows (even when alpha is 1). There’s also weird artifacts when objects are slightly transparent but I only see the odd artifact in Unity 2022 (Apple Silicon). Unity 2021 LTS (Apple Silicon) versions don’t seem to have this issue.

When the material is opaque it behaves normally:

197534-opaque.jpg
197534-opaque.jpg1218×884 131 KB

But when it’s transparent it doesn’t cast a shadow even when alpha is 1:

197535-transparent.jpg
197535-transparent.jpg1262×862 144 KB

Here’s the material’s property’s visible in the inspector: CleanShot 2022-06-14 at 13.08.57 · CleanShot Cloud

Also here’s the weird artifact I mentioned earlier which I believe to be a bug: CleanShot 2022-06-14 at 13.10.01 · CleanShot Cloud as you can see the alpha is 0 and the object is still visisble.

2

In my opinion, Transparent objects has no shadow. The light passes through the transparent objects. That’s why these objects will not form shadow. But, the objects like glass slab are not completely transparent. In such objects, the light gets refracted thus, such objects forms shadow.