Question Using SAMPLE_SCENE_COLOR in custom function

Hi there,

I'm trying to use Scene Color in a custom function but all I get is a grey output. My function just calls
SHADERGRAPH_SAMPLE_SCENE_COLOR() and returns the color (see screenshot below). My goal is to code a shader graph node that does a screen blur.

If I replace my custom function by the Scene Color node then it works perfectly so I assume my setup is correct (transparent surface + generate opaque texture).

Any help is welcome, thanks!

(Unity 2019.4 - latest packages)

 

Hi,
I'm not sure if I follow your logic - couldn't you use Custom Function node and input the necessary things like UV, sampler state and a Texture2D, and then create your blur by writing necessary code in a file or that Body box. That's how I've done a blur node.

 

Hi Olmi,
I didn't realized you could access the opaque texture directly, which you can with a reference to _CameraOpaqueTexture (see screenshot below). Using that texture I was able to do the blur in HLSL so thanks a bunch!

Just out of curiosity, shouldn't the call to SHADERGRAPH_SAMPLE_SCENE_COLOR() have worked though? May be I need to add some #define the HLSL script to be able to use it or something like that?

 

In looking at the compiled shader - it would appear that it just calls the function (SHADERGRAPH_SAMPLE_SCENE_COLOR), but never actually defines it - which should throw an error, but doesn't. Super weird.

If you use the "Scene Color" node somewhere in your graph, it'd probably work, but that would be unnecessarily redundant...

 

SHADERGRAPH_SAMPLE_SCENE_COLOR(UV.xy) - works only if node "Scene Color" included in you graph. I dont know wtf, but it here you can see my tests:

 

Thanks，funnymanwin ！