How to get pixel coordinates in an image effect shader

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Hi, I want to create a post processing shader. I need the view direction of the current pixel. However I have no idea how to do it.

Answer 1

Answer by ifurkend · May 08, 2021 at 11:50 AM

Screen position https://docs.unity3d.com/Packages/com.unity.shadergraph@6.9/manual/Screen-Position-Node.html

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Answer 2

Answer by Borcam · May 09, 2021 at 05:50 AM

Thanks but I think I forgot to say that I am not using shader graph. This is my frag shader(currently it just inverts the colors)

     float4 frag(v2f_img i) : COLOR
                 {
                     float4 c = tex2D(_MainTex, i.uv);
                     c.rgb = 1 - c.rgb;
                     return c;
                 }

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ifurkend · May 09, 2021 at 01:53 PM 0

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That "i.uv" is already the pixel coordinates for your image effect shader. If you want to get the pixel projection on the camera plane of a Vector3 point in the world space, You get that by Camera.WorldToScreenPoint in C# script and then set that to your image effect material.

https://docs.unity3d.com/ScriptReference/Camera.WorldToScreenPoint.html

How to get pixel coordinates in an image effect shader

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