Ambient Node is Vector3 but Universal RP is Vector4

Unity Engine
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1

If want use enviroment lighting (ambient color), ShaderGraph can use Ambient Node.
But use ambient node in Universal Render Pipeline, log warning message. like:
'Unity_Lerp_half3': implicit truncation of vector type

I found why log warning message.
It’s because SHADERGRAPH_AMBIENT_SKY macro is float4 unity_AmbientSky, in Universal Render Pipeline.

  • What are the cases where you have to worry about this warning?
  • Should I report it as a bug report?
2

These warnings are safe to ignore, albeit annoying. They’re a bit too common when using Shader Graph unfortunately. It’ll end up being compiled to a float3 anyway (using the XYZ components, through assumption).

A way around this is to use a Split node, then pipe the XYZ components into a Combine node to form a new float3. Though dealing with these warnings is easier than with the resulting spaghetti graph

There’s no harm in filing a bug report, if you’re willing to put in the effort!

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