shader之——单光源，法线，高光，+cubeMap

Shader "baicai/me02" {    Properties {        _MainTex ("MainTex", 2D) = "white" {}        _Bump ("Bump", 2D) = "bump" {}        _Intension ("强度", Range(0, 10)) = 10        _Scale ("范围", Range(0, 1)) = 0.5969197        _SpecularColor("SpecularColor",Color) = (1,1,1,1)        _Cubemap ("Cubemap",Cube) = ""{} /////    }    SubShader {        Tags {            "RenderType"="Opaque"        }        Pass {            Tags {                "LightMode"="ForwardBase"            }                                    CGPROGRAM            #pragma vertex vert            #pragma fragment frag            #define UNITY_PASS_FORWARDBASE            #include "UnityCG.cginc"            #include "AutoLight.cginc"            #pragma multi_compile_fwdbase_fullshadows            #pragma target 3.0             float4 _LightColor0;             sampler2D _MainTex;             float4 _MainTex_ST;             sampler2D _Bump;              float4 _Bump_ST;             float _Intension;             float _Scale;             float4 _SpecularColor;             samplerCUBE _Cubemap;             struct VertexInput {                float4 vertex : POSITION;                float3 normal : NORMAL;                float4 tangent : TANGENT;                float2 uv : TEXCOORD0;            };            struct v2f {                float4 pos : SV_POSITION;                float2 uv : TEXCOORD0;                float4 posWorld : TEXCOORD1;                float3x3 tangentTransform:TEXCOORD2;                LIGHTING_COORDS(3,4)            };            ///需要把顶点着色器中的切线空间转化为世界空间            ///或者把世界空间的所有向量转化为切线空间              v2f vert (VertexInput v) {                v2f o ;                o.pos = UnityObjectToClipPos(v.vertex );                o.uv =TRANSFORM_TEX(v.uv, _MainTex);                //求世界法线三件套                float3 normal =normalize( UnityObjectToWorldNormal(v.normal));                float3 tangentDir = normalize( mul( unity_ObjectToWorld, float4( v.tangent.xyz, 0.0 ) ).xyz );//切线空间转化为世界空间                float3 bitangentDir = normalize(cross(normal, tangentDir) * v.tangent.w);//切线 法线 计算副切线                //得出结合切线的世界法线                o.tangentTransform = float3x3( tangentDir, bitangentDir, normal);                 //物体世界坐标                o.posWorld = mul(unity_ObjectToWorld, v.vertex);                TRANSFER_VERTEX_TO_FRAGMENT(o)                return o;            }                float4 frag(v2f i) : COLOR {                                                 float3 BumpMap = UnpackNormal(tex2D(_Bump,i.uv));                float3 N = normalize(mul( BumpMap.rgb, i.tangentTransform )); //根据模型的世界法线 将法线贴图转换为世界空间                float3 V = normalize(_WorldSpaceCameraPos.xyz - i.posWorld.xyz); //视向量                float3 L = normalize(_WorldSpaceLightPos0.xyz);                float3 speL = normalize(V+L); //视向量 + 光向量，得到一个高光的光向量////// Lighting:                float atten = LIGHT_ATTENUATION(i);///////// Gloss:                float Gloss = exp2( _Scale * 10.0+1.0);////// Specular:                float NdotSpeL = saturate(dot (speL,N)); //高光强度                float4 col = tex2D(_MainTex,i.uv);                float3 specular0 = atten * _LightColor0.xyz * pow(NdotSpeL,Gloss) * _SpecularColor * _Intension*col.a;///////worldRefl:cubMap                half3 worldRefl = reflect (-V,N);/////                half3 cube=texCUBE(_Cubemap, worldRefl).rgb;//////////// Diffuse:                float NdotL = saturate(dot( N, L )); //漫反射强                            col.rgb= col.rgb * (NdotL *_LightColor0.xyz * atten + UNITY_LIGHTMODEL_AMBIENT.rgb);                /// Final Color:                col.rgb = col.rgb + specular0 + cube*col.a;/////                            return col;            }            ENDCG        }   }   FallBack "Diffuse"}

//真正运用的时候，还是需要把一些计算放到顶点着色器里，让效率达到最高