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Question by ViktorKurtev · Sep 17, 2018 at 01:58 PM · shadertimeshader writing

Shader Graph not updating time related nodes in preview

Hey! Been fiddling around with shader graph for a bit and its a blast, but I can't figure out how to make the preview update when time is involved. If I click play everything is great, but I can't see the shader animate in the preview part of the shader graph.

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avatar image alexSquared · Sep 17, 2018 at 09:44 PM 0
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I am getting exactly the same issue as of today, using the HD render pipeline shader.It was initally updating the shader preview and still updates the nodes, however as I made my shader more complicated, the 3d preview stopped working (the nodes continue to work). When i run my project, I can see that the shader is working correctly. Potentially a bug with the HD shadergraph?

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Answer by Tzanislav · Aug 13, 2021 at 08:07 PM

I don't know if I had the same issue but in my case the Shader Graph preview showed what I expected but in game nothing happened.

I solved my issue (or at least got around it) by creating a Vector1 variable in my shader graph and setting it to be NOT exposed (this makes it "global") and creating a small C# script that controls it something like this:

     void Update()
     {
         t = Mathf.Sin(Time.time);
         Shader.SetGlobalFloat("_sTime", t);
     }


I am using HDRP on 2020.1.14f1

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