UnityShaderBook/Assets/Shaders/Chapter6/Chapter6-DiffuseVertexLevel.shader

// Upgrade NOTE: replaced '_World2Object' with 'unity_WorldToObject'
// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'

Shader "Unity Shaders Book/Chapter 6/Diffuse Vertex-Level" {
	Properties {
	}
	SubShader {
		Pass { 
			Tags { "LightMode"="ForwardBase" }
		
			CGPROGRAM
			
			#pragma vertex vert
			#pragma fragment frag
			
			#include "Lighting.cginc"
			
			
			struct a2v {
				float4 vertex : POSITION;
				float3 normal : NORMAL;
			};
			
			struct v2f {
				float4 pos : SV_POSITION;
				fixed3 color : COLOR;
			};
			
			v2f vert(a2v v) {
				v2f o;
				// Transform the vertex from object space to projection space
				o.pos = UnityObjectToClipPos(v.vertex);
				
				// Get ambient term
				//fixed3 ambient = UNITY_LIGHTMODEL_AMBIENT.xyz;
				

				// Transform the normal from object space to world space
				//fixed3 worldNormal = normalize(mul(v.normal, (float3x3)unity_WorldToObject));
				fixed3 worldNormal = UnityObjectToWorldNormal(v.normal);
				fixed3 ambient = ShadeSH9(fixed4(worldNormal,1));
				// Get the light direction in world space
				fixed3 worldLight = normalize(_WorldSpaceLightPos0.xyz);
				// Compute diffuse term
				fixed3 diffuse = _LightColor0.rgb * saturate(dot(worldNormal, worldLight));
				
				o.color = ambient + diffuse;

				
				return o;
			}
			
			fixed4 frag(v2f i) : SV_Target {
				return fixed4(i.color, 1.0);
			}
			
			ENDCG
		}
	}
	FallBack "Diffuse"
}