How Does One Toggle Self-Illumination On/Off in Shader?

Questions & Answers
1

Hey guys,

The goal is to have a self-illuminated object whose illumination turns on/off based on a boolean “powered”, which also works in VertexLit mode. (set on the Camera)

I modified slightly the default Self-Illum-Diffuse shader to allow for this (check this line, where I multiply the end result by _Emission, from 0-1:

o.Emission = c.rgb * UNITY_SAMPLE_1CHANNEL(_Illum, IN.uv_Illum) * _Emission;

) but it doesn’t work in VertexLit mode - how can I convert this into a compatible shader?

Also, is there a more efficient / easier way to accomplish this?

Thanks!

Shader "Custom/Self-Illumin/Diffuse" {
	Properties {
		_MainTex ("Base (RGB) Gloss (A)", 2D) = "white" {}
		_Illum ("Illumin (A)", 2D) = "white" {}
		_Emission ("Emission", Range(0, 1.0)) = 1
	}
	SubShader {
		Tags { "RenderType"="Opaque" }
		LOD 200
	
		CGPROGRAM
		#pragma surface surf Lambert

		sampler2D _MainTex;
		sampler2D _Illum;
		float _Emission;

		struct Input {
			float2 uv_MainTex;
			float2 uv_Illum;
		};

		void surf (Input IN, inout SurfaceOutput o) {
			fixed4 tex = tex2D(_MainTex, IN.uv_MainTex);
			fixed4 c = tex * fixed4(1,1,1,1);
			o.Albedo = c.rgb;
			o.Emission = c.rgb * UNITY_SAMPLE_1CHANNEL(_Illum, IN.uv_Illum) * _Emission;
			o.Alpha = c.a;
		}
		ENDCG
	}
	FallBack "Self-Illumin/VertexLit"
}
2

If you want to switch between self-illuminated and not-self-illuminated, use renderer.material.shader and switch between self-illuminated and diffuse.