Unity Shader to visualize vertex color.

VertexColor.shader

Shader "Custom/VertexColor" {
	SubShader {
		Tags { "RenderType"="Opaque" }
		LOD 200
		
		CGPROGRAM
		#pragma surface surf Lambert vertex:vert
		#pragma target 3.0

		struct Input {
			float4 vertColor;
		};

		void vert(inout appdata_full v, out Input o){
			UNITY_INITIALIZE_OUTPUT(Input, o);
			o.vertColor = v.color;
		}

		void surf (Input IN, inout SurfaceOutput o) {
			o.Albedo = IN.vertColor.rgb;
		}
		ENDCG
	}
	FallBack "Diffuse"
}

@jhorikawa Still works great for Unity 2019.2.
Do you have an idea how to use it with the Lightweight-Renderpipeline?

hi jhorikawa

Thank you for sharing this shader code! I'm not a programmer just a gfx guy :)

I made a test. I changed your code in line 20:
o.Emissive = IN.vertColor.rgb;
because I want only vertex color lit on the scene without any lamp. (vertex color with ambient support)

But I have a "small" problem in Unity.

Left is the original mesh in Maya without lighting/shading - vertex color as "emissive"
The mesh's edges are smooth (each vertex has 1 vertex normal).

When I importing the mesh with vertex color and give this shader to them the colors

1. changed to yellow (no lights in the scene)
2. looks like there is some kind of shading and looks like the vertex normals changed

I don't know how can I fix this.
Do you have any idea?

Ok!

I solved the bug. I tweaked Maya baking and fixed the bug!
Your shader working well!!!

(The gamma is different)

Lifesaver🙌🙌