Transparent Material not casting shadows

Unity Engine
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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:

04abb8f90c299b872359be9e1131c9ce6947c3f3.jpeg
04abb8f90c299b872359be9e1131c9ce6947c3f3.jpeg1218×884 131 KB

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

1c12744e86db466590024281bb7c26aa2f77109c.jpeg
1c12744e86db466590024281bb7c26aa2f77109c.jpeg1262×862 144 KB

Here’s the material’s property’s visible in the inspector:

8203719--1070397--Material Properties.png
8203719--1070397--Material Properties.png758×1402 44.1 KB

Also here’s the weird artifact I mentioned earlier which I believe to be a bug
it won’t let me upload more files because I can’t upload more than 5 (even though I only uploaded 3) so here’s a link instead: https://share.cleanshot.com/hnJGKc. As you can see even when the alpha is 0 the object is still visible.

1c12744e86db466590024281bb7c26aa2f77109c.jpeg
1c12744e86db466590024281bb7c26aa2f77109c.jpeg1262×862 144 KB

04abb8f90c299b872359be9e1131c9ce6947c3f3.jpeg
04abb8f90c299b872359be9e1131c9ce6947c3f3.jpeg1218×884 131 KB

3 Likes
2

Hi,

Odd, I am wondering the same thing, so far can’t find anything when googling or fiddling with settings…

Bye,

Jean

3

There was another thread concerning this, Shadows not casting with LWRP Lit Shader (Transparent Surface)
I posted what was working for me using the default shaders.