[Port] [6000.0] [UUM-78803] Implement Main Light Direction node on builtin

svc-reach-platform-support · Evergreen · commit 82f12846fc2b · 2024-10-28T23:04:25.000Z
https://jira.unity3d.com/browse/UUM-78803 This PR adds an implementation of the Main Light Direction node on builtin. I couldn't find any official indication it was unsupported, and `_WorldSpaceLightPos0` works fine.
diff --git a/Packages/com.unity.shadergraph/Editor/Generation/Targets/BuiltIn/ShaderLibrary/ShaderGraphFunctions.hlsl b/Packages/com.unity.shadergraph/Editor/Generation/Targets/BuiltIn/ShaderLibrary/ShaderGraphFunctions.hlsl
@@ -92,7 +92,7 @@ float3x3 BuildTangentToWorld(float4 tangentWS, float3 normalWS)
 
 float3 shadergraph_MainLightDirection()
 {
-    return 0.0f;
+    return -_WorldSpaceLightPos0.xyz * (1.0 - _WorldSpaceLightPos0.w);
 }
 
 float3 shadergraph_RendererBoundsWS_Min()

Original file line number	Diff line number	Diff line change
`@@ -92,7 +92,7 @@ float3x3 BuildTangentToWorld(float4 tangentWS, float3 normalWS)`
`92`	`92`
`93`	`93`	`float3 shadergraph_MainLightDirection()`
`94`	`94`	`{`
`95`		`- return 0.0f;`
	`95`	`+ return -_WorldSpaceLightPos0.xyz * (1.0 - _WorldSpaceLightPos0.w);`
`96`	`96`	`}`
`97`	`97`
`98`	`98`	`float3 shadergraph_RendererBoundsWS_Min()`