Shader "Custom/On Off Lighting"
{
        Properties
        {
            _Color ("Color", Color) = (1,1,1,1)
            _Shadow ("Shadow Color", Color) = (1,1,1,1)
            _ShadowStrength ("Shadow Strength", Range(0,1)) = 0.2
        }
        SubShader
        {
            Tags { "RenderType" = "Opaque" }
            CGPROGRAM
            #pragma surface surf OnOff fullforwardshadows

            half4 _Color;
            half4 _Shadow;
            half _ShadowStrength;

            // just want to know if we're in light or shadow, so simply ON/OFF (thus the SIGN)
            half4 LightingOnOff (SurfaceOutput s, half3 lightDir, half atten)
            {
                half NdotL = dot (s.Normal, lightDir);
                return abs(sign(NdotL * atten));
            }

            // not used but still here, w/e
            struct Input { float2 uv_MainTex; };

            // Want to somehow take the lighting result above, and make the result color be the Color value,
            // shifted towards Shadow value (ex. result = lerp(_Color, _Shadow, LightingResult * _ShadowStrength))
            void surf (Input IN, inout SurfaceOutput o)
            {
                o.Albedo = _Color.rgb;
                o.Gloss = 0;
                o.Specular = 0;
            }
            ENDCG
        }
        Fallback "Diffuse"
    }