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原图：
效果图：
- 切线空间下的凹凸映射：
Shader "_MyShader/4_Texture/2_BumpMap/TangentSpace"
{
Properties
{
_Color ("Color",COLOR) = (1,1,1,1)
_MainTex ("MainTex",2D) = "white" {}
_BumpMap ("NormalMap",2D) = "bump" {}
_BumpScale ("BumpScale",float) = 1.0
_SpecularRange ("SpecularRange",Range(10,250)) = 20
}
SubShader
{
Pass
{
Tags{"LightMode" = "ForwardBase"}
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "Lighting.cginc"
#include "UnityCG.cginc"
fixed4 _Color;
sampler2D _MainTex;
float4 _MainTex_ST;
sampler2D _BumpMap;
float4 _BumpMap_ST;
float _BumpScale;
float _SpecularRange;
struct a2v {
float4 vertex:POSITION;
float4 tangent:TANGENT;
float4 texcoord:TEXCOORD0;
float3 normal:NORMAL;
};
struct v2f{
float4 pos:SV_POSITION;
float4 uv:TEXCOORD0;
float3 tangentLightDir:TEXCOORD1;
float3 tangentViewDir:TEXCOORD2;
float3 blinn_Phong_Dir:TEXCOORD3;
};
v2f vert(a2v v){
v2f o;
o.pos = mul(UNITY_MATRIX_MVP,v.vertex);
//o.uv.xy = v.texcoord.xy * _MainTex_ST.xy + _MainTex_ST.zw;
//o.uv.zw = v.texcoord.xy * _BumpMap_ST.xy + _BumpMap_ST.zw;
o.uv.xy = TRANSFORM_TEX(v.texcoord,_MainTex);
o.uv.zw = TRANSFORM_TEX(v.texcoord,_BumpMap);
TANGENT_SPACE_ROTATION;
o.tangentLightDir = normalize(mul(rotation,ObjSpaceLightDir(v.vertex)));
o.tangentViewDir = normalize(mul(rotation,ObjSpaceViewDir(v.vertex)));
//Blinn-Phong
o.blinn_Phong_Dir = normalize(o.tangentLightDir + o.tangentViewDir);
return o;
}
fixed4 frag(v2f i):SV_Target{
//UnpackNormal，UnpackNormalDXT5nm 得到正确的法线方向
fixed3 tangentNormal = UnpackNormalDXT5nm(tex2D(_BumpMap,i.uv.zw));
tangentNormal *= _BumpScale;
fixed3 uvTex = tex2D(_MainTex,i.uv.xy).rgb * _Color.rgb;
fixed3 ambientColor = UNITY_LIGHTMODEL_AMBIENT.xyz * uvTex;
fixed3 diffuseColor = _LightColor0 * uvTex * saturate(dot(tangentNormal,i.tangentLightDir));
fixed3 SpecularColor = _LightColor0 * pow(saturate(dot(tangentNormal,i.blinn_Phong_Dir)),_SpecularRange);
fixed4 col = fixed4(diffuseColor + SpecularColor + ambientColor,1);
return col;
}
ENDCG
}
}
FallBack "Specular"
}
- 世界空间下的凹凸映射
Shader "_MyShader/4_Texture/2_BumpMap/WorldSpace"
{
Properties
{
_Color ("Color",COLOR) = (1,1,1,1)
_MainTex ("MainTex",2D) = "white" {}
_BumpMap ("NormalMap",2D) = "bump" {}
_BumpScale ("BumpScale",float) = 1.0
_SpecularRange ("SpecularRange",Range(10,250)) = 20
}
SubShader
{
Pass
{
Tags{"LightMode" = "ForwardBase"}
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "Lighting.cginc"
#include "UnityCG.cginc"
fixed4 _Color;
sampler2D _MainTex;
float4 _MainTex_ST;
sampler2D _BumpMap;
float4 _BumpMap_ST;
float _BumpScale;
float _SpecularRange;
struct a2v {
float4 vertex:POSITION;
float4 tangent:TANGENT;
float4 texcoord:TEXCOORD0;
float3 normal:NORMAL;
};
struct v2f{
float4 pos:SV_POSITION;
float4 uv:TEXCOORD0;
float3 worldLightDir:TEXCOORD1;
float3 blinn_Phong_Dir:TEXCOORD2;
float3 TtoW0:TEXCOORD3;
float3 TtoW1:TEXCOORD4;
float3 TtoW2:TEXCOORD5;
};
v2f vert(a2v v){
v2f o;
o.pos = mul(UNITY_MATRIX_MVP,v.vertex);
//o.uv.xy = v.texcoord.xy * _MainTex_ST.xy + _MainTex_ST.zw;
//o.uv.zw = v.texcoord.xy * _BumpMap_ST.xy + _BumpMap_ST.zw;
o.uv.xy = TRANSFORM_TEX(v.texcoord,_MainTex);
o.uv.zw = TRANSFORM_TEX(v.texcoord,_BumpMap);
o.worldLightDir = normalize(WorldSpaceLightDir(v.vertex));
float3 worldViewDir = normalize(WorldSpaceViewDir(v.vertex));
float3 worldNormal = UnityObjectToWorldNormal(v.normal);
float3 worldTangent = UnityObjectToWorldDir(v.tangent);
float3 binormal = cross( normalize(v.normal), normalize(v.tangent.xyz) ) * v.tangent.w;
//Blinn-Phong
o.blinn_Phong_Dir = normalize(o.worldLightDir + worldViewDir);
o.TtoW0 = float3(worldTangent.x,binormal.x,worldNormal.x);
o.TtoW1 = float3(worldTangent.y,binormal.y,worldNormal.y);
o.TtoW2 = float3(worldTangent.z,binormal.z,worldNormal.z);
return o;
}
fixed4 frag(v2f i):SV_Target{
//UnpackNormal，UnpackNormalDXT5nm 得到正确的法线方向
//fixed3 worldNormal = UnpackNormalDXT5nm(tex2D(_BumpMap,i.uv.zw));
//worldNormal *= _BumpScale;
fixed3 bump = UnpackNormal(tex2D(_BumpMap,i.uv.zw));
bump.xy *= _BumpScale;
bump.z = sqrt(1 - saturate(dot(bump.xy, bump.xy)));
fixed3 uvTex = tex2D(_MainTex,i.uv.xy).rgb * _Color.rgb;
fixed3 ambientColor = UNITY_LIGHTMODEL_AMBIENT.xyz * uvTex;
fixed3 diffuseColor = _LightColor0 * uvTex * saturate(dot(bump,i.worldLightDir));
fixed3 SpecularColor = _LightColor0 * pow(saturate(dot(bump,i.blinn_Phong_Dir)),_SpecularRange);
fixed4 col = fixed4(diffuseColor + SpecularColor + ambientColor,1);
return col;
}
ENDCG
}
}
FallBack "Specular"
}