ComputeScreenPos & Render queue issues

Graphics Shaders & Materials
1

Hello all,

I am finishing up my water shader and am trying to get shadows on top of it. I found out if the render queue is set to transparent then it will not recieve shadows, so I set it to:
Tags { “RenderType” = “Transparent” “Queue” = “Geometry+1”}

Problem is the shader throws an error about ComputeScreenPos:
Out.scrPos = ComputeScreenPos(Out.position);
invalid subscript ‘pos’ ‘ComputeScreenPos’: no matching 1 parameter function at line 224

Line 224 holds the Transfer shadow function:
TRANSFER_VERTEX_TO_FRAGMENT(Out);

When the Queue is set to transparent it all seems to work (without shadows of course) Am I missing something with the render queue and compute screen pos?

If you need more information like code snippets please do not hesitate to ask

  • Ben
2

Oh I am also using grab pass to gain refraction under the surface of the shader, will the change of queue from “Transparent” to “Geometry+1” be the reason affecting this?

  • Ben
3

Ok so I found out why my code was throwing errors.

It turns out when you use TRANSFER_VERTEX_TO_FRAGMENT to create shadows if you have a custom struct and your semantics are not named exactly as they are here: Unity - Manual: Providing vertex data to vertex programs

i.e. vertex instead of position and your outputting vertex position must be named pos the function throws an error. Seems a bit odd but Unity is full of quirky things :slight_smile:

4 Likes
4

Thanks.
It work for me!!

5

Thanks so much!!

6

Four years and it’s still quirky…thanks very much!

7

2021 and this still is the “solution” to make the windows build.
Thank you for finding this and sharing!

8

2022 and this is still saving people hours of headaches! Thanks!

9

Thank you! This worked for me