_worldSpaceLightPos0 is always 0

Unity Engine
1

Hi,

I’m trying to read a directional light direction from a fragment shader, but its always 0’s… I have the Directional light in the hierarchy, and I’m including the “LightMode” = “ForwardBase” tag to the pass to ensure it gets updated by the Mesh Renderer…

I’ve simplified my code to this:

Shader "NV Shaders/ComicStyleNoSurfaceFromGroundUp" {
	SubShader {
		Pass{
			Tags { "LightMode" = "ForwardBase" }
		
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			#include "UnityCG.cginc"
				
			struct vertexInput {
				float4 vertex : POSITION;
			};
		
			struct vertexOutput {
				float4 pos : SV_POSITION;
			};

			vertexOutput vert( vertexInput v )
			{
				vertexOutput o;
				
				o.pos  = mul( UNITY_MATRIX_MVP, v.vertex );
				
				return o;
			}

			half4 frag( vertexOutput i ) : COLOR
			{
				float3 lightDir = normalize( float3(_WorldSpaceLightPos0 ) );

				return half4( lightDir, 1 );
			}
			ENDCG
		}
	}
}

but the mesh is always drawn in black color…

do you have any idea what could be wrong or what could I be missing?

Thanks!

2

Do you have a directional light source without cookie in your scene?

EDIT: And are you using forward rendering?

3

Thanks Mark,

that did it! =)

+1