アルファブレンディング シャドウキャスター シャドウレシーバー
なシェーダー。
基本新規作成Create -> Shader -> UnLitShaderCustomShader
Shader "CustomShader"{ Properties { _MainTex ("Texture", 2D) = "white" {} } SubShader { Tags { "RenderType"="Opaque" } LOD 100
Pass { CGPROGRAM #pragma vertex vert #pragma fragment frag // make fog work #pragma multi_compile_fog
#include "UnityCG.cginc"
struct appdata { float4 vertex : POSITION; float2 uv : TEXCOORD0; };
struct v2f { float2 uv : TEXCOORD0; UNITY_FOG_COORDS(1) float4 vertex : SV_POSITION; };
sampler2D _MainTex; float4 _MainTex_ST;
v2f vert (appdata v) { v2f o; o.vertex = mul(UNITY_MATRIX_MVP, v.vertex); o.uv = TRANSFORM_TEX(v.uv, _MainTex); UNITY_TRANSFER_FOG(o,o.vertex); return o; }
fixed4 frag (v2f i) : SV_Target { // sample the texture fixed4 col = tex2D(_MainTex, i.uv); // apply fog UNITY_APPLY_FOG(i.fogCoord, col); return col; } ENDCG } }}
この時点でテクスチャが表示できるけど一度無にしようShader "CustomShader"{ SubShader { Tags { "RenderType"="Opaque" } LOD 100 Pass { CGPROGRAM #pragma vertex vert #pragma fragment frag float4 vert(float4 v:POSITION) : SV_POSITION{ return mul(UNITY_MATRIX_MVP, v); } fixed4 frag() : COLOR{ return fixed4(1.0,0.0,0.0,1.0); } ENDCG } }}
頂点変形だけを適用して赤一色。Colorべたにマテリアル色が出る。Shader "CustomShader"{ Properties { _Color("Color", Color) = (1,1,1,1) } SubShader { Tags{ "RenderType" = "Opaque" } LOD 100
Pass { CGPROGRAM#pragma target 3.0#pragma vertex vert#pragma fragment frag
uniform float4 _Color;
float4 vert(float4 v:POSITION) : SV_POSITION{ return mul(UNITY_MATRIX_MVP, v); } fixed4 frag() : COLOR{ return _Color; } ENDCG }
} // SurShader}
_Colorプロパティを定義して、uniform変数_Colorを宣言し使う。Textureテクスチャ色を乗算Shader "CustomShader"{ Properties { _Color("Color", Color) = (1,1,1,1) _MainTex("Base (RGB) Trans (A)", 2D) = "white" {} } SubShader { Tags{ "RenderType" = "Opaque" } LOD 100
Pass { CGPROGRAM#pragma target 3.0#pragma vertex vert#pragma fragment frag
struct appdata { float4 vertex : POSITION; float2 uv : TEXCOORD0; }; struct v2f { float2 uv : TEXCOORD0; float4 vertex : SV_POSITION; };
uniform float4 _Color; uniform sampler2D _MainTex;
v2f vert(appdata v){ v2f o; o.vertex= mul(UNITY_MATRIX_MVP, v.vertex); o.uv = v.uv; return o; } fixed4 frag(v2f i) : COLOR{ fixed4 tex = tex2D(_MainTex, i.uv); return _Color * tex; } ENDCG }
} // SurShader}
シェーダーの入力に位置とUV、出力に変換済みの位置とUVが必要になったので構造体appdataとv2fを導入_MainTexプロパティを導入し、サンプラー_MainTexを宣言してtex2D関数で使う
AlphaBlending追加分Shader "CustomShader"{ SubShader { // 背景を含む不透明なものの後で描画する Tags{ "Queue" = "Transparent" }
Pass { Blend SrcAlpha OneMinusSrcAlpha }
} // SurShader}
ここまでで照明の無い基本的なシェーダーができる。UnityCG.cgincを使う最初に新規作成したShaderにAplhaBlendingを追加した感じ。uniform変数のuniformは省略できる。Shader "CustomShader"{ Properties { _Color("Color", Color) = (1,1,1,1) _MainTex("Base (RGB) Trans (A)", 2D) = "white" {} } SubShader { Tags{ "Queue" = "Transparent" } LOD 100
Pass { Blend SrcAlpha OneMinusSrcAlpha
CGPROGRAM #pragma target 3.0 #pragma vertex vert #pragma fragment frag
// make fog work #pragma multi_compile_fog
#include "UnityCG.cginc"
struct appdata { float4 vertex : POSITION; float2 uv : TEXCOORD0; };
struct v2f { float2 uv : TEXCOORD0; UNITY_FOG_COORDS(1) float4 vertex : SV_POSITION; };
float4 _Color; sampler2D _MainTex; float4 _MainTex_ST;
v2f vert(appdata v) { v2f o; o.vertex = mul(UNITY_MATRIX_MVP, v.vertex); o.uv = TRANSFORM_TEX(v.uv, _MainTex); UNITY_TRANSFER_FOG(o,o.vertex); return o; }
fixed4 frag(v2f i) : SV_Target { // sample the texture fixed4 col = tex2D(_MainTex, i.uv); // apply fog UNITY_APPLY_FOG(i.fogCoord, col); return col * _Color; } ENDCG }
} // SurShader}
Lighting導入Vertex and Fragment Shader Examplesの後半Calculating Lightingを参考にライティングをやってみる。forward rendringを使うことで
DirectionalLightambientlightmapreflections
を扱える。Tags {"LightMode"="ForwardBase"}
を定義することでUnityの組み込み変数を通じて上記のシーンのライティング情報を得ることができるようになる。頂点ライティングによるDiffuse & Ambient
DirectionalLightによるDiffuse計算appdata_base導入(UnityCG.cgincで定義)v2fにdiffuse追加vertでdiffuse計算
Shader "CustomShader"{ Properties { _Color("Color", Color) = (1,1,1,1) _MainTex("Base (RGB) Trans (A)", 2D) = "white" {} } SubShader { Tags{ "Queue" = "Transparent" } LOD 100
Pass { Tags{ "LightMode" = "ForwardBase" }
Blend SrcAlpha OneMinusSrcAlpha
CGPROGRAM #pragma target 3.0 #pragma vertex vert #pragma fragment frag
// make fog work #pragma multi_compile_fog
#include "UnityCG.cginc" #include "UnityLightingCommon.cginc" // for _LightColor0
struct v2f { float2 uv : TEXCOORD0; fixed4 diffuse : COLOR0; // diffuse lighting color float4 vertex : SV_POSITION; UNITY_FOG_COORDS(1) };
uniform float4 _Color; uniform sampler2D _MainTex; float4 _MainTex_ST;
v2f vert(appdata_base v) { v2f o; o.vertex = mul(UNITY_MATRIX_MVP, v.vertex); o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);
// get vertex normal in world space half3 worldNormal = UnityObjectToWorldNormal(v.normal); // dot product between normal and light direction for // standard diffuse (Lambert) lighting half nl = max(0, dot(worldNormal, _WorldSpaceLightPos0.xyz)); // factor in the light color o.diffuse = nl * _LightColor0;
// the only difference from previous shader: // in addition to the diffuse lighting from the main light, // add illumination from ambient or light probes // ShadeSH9 function from UnityCG.cginc evaluates it, // using world space normal o.diffuse.rgb += ShadeSH9(half4(worldNormal,1));
UNITY_TRANSFER_FOG(o,o.vertex); return o; }
fixed4 frag(v2f i) : SV_Target { // sample the texture fixed4 col = tex2D(_MainTex, i.uv) * _Color; // apply fog UNITY_APPLY_FOG(i.fogCoord, col); col.rgb *= i.diffuse; return col; } ENDCG }
} // SurShader}
ShadowキャスティングShadowMapに深度を描画するPassを追加する。簡単なのは下記。// pull in shadow caster from VertexLit built-in shaderUsePass "Legacy Shaders/VertexLit/SHADOWCASTER"
手作りもできる。
pragma multi_compile_shadowcasterがポイント
// shadow caster rendering pass, implemented manually // using macros from UnityCG.cginc Pass { Tags{ "LightMode" = "ShadowCaster" }
CGPROGRAM #pragma vertex vert #pragma fragment frag #pragma multi_compile_shadowcaster #include "UnityCG.cginc"
struct v2f { V2F_SHADOW_CASTER; };
v2f vert(appdata_base v) { v2f o; TRANSFER_SHADOW_CASTER_NORMALOFFSET(o) return o; }
float4 frag(v2f i) : SV_Target { SHADOW_CASTER_FRAGMENT(i) } ENDCG }
ShadowReceiveing
pragma multi_compile_fwdbaseがポイント
Shader "CustomShader"{ Properties { _Color("Color", Color) = (1,1,1,1) _MainTex("Base (RGB) Trans (A)", 2D) = "white" {} } SubShader { Tags{ "Queue" = "Geometry" } LOD 100
Pass { Tags{ "LightMode" = "ForwardBase" "IgnoreProjector" = "True" "PerformanceChecks" = "False" } ZWrite On Blend SrcAlpha OneMinusSrcAlpha
CGPROGRAM #pragma target 3.0 #pragma vertex vert #pragma fragment frag
// make fog work #pragma multi_compile_fog
#include "UnityCG.cginc" #include "UnityLightingCommon.cginc" // for _LightColor0
// compile shader into multiple variants, with and without shadows // (we don't care about any lightmaps yet, so skip these variants) #pragma multi_compile_fwdbase nolightmap nodirlightmap nodynlightmap novertexlight // shadow helper functions and macros #include "AutoLight.cginc"
struct v2f { float2 uv : TEXCOORD0; float4 pos : SV_POSITION; fixed4 diff : COLOR0; // diffuse lighting color fixed3 ambient : COLOR1; SHADOW_COORDS(1) // put shadows data into TEXCOORD1 UNITY_FOG_COORDS(1) };
uniform float4 _Color; uniform sampler2D _MainTex; float4 _MainTex_ST;
v2f vert(appdata_base v) { v2f o; o.pos = mul(UNITY_MATRIX_MVP, v.vertex); o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);
// get vertex normal in world space half3 worldNormal = UnityObjectToWorldNormal(v.normal); // dot product between normal and light direction for // standard diffuse (Lambert) lighting half nl = max(0, dot(worldNormal, _WorldSpaceLightPos0.xyz)); // factor in the light color o.diff = nl * _LightColor0;
// the only difference from previous shader: // in addition to the diffuse lighting from the main light, // add illumination from ambient or light probes // ShadeSH9 function from UnityCG.cginc evaluates it, // using world space normal o.ambient = ShadeSH9(half4(worldNormal, 1));
// compute shadows data TRANSFER_SHADOW(o)
UNITY_TRANSFER_FOG(o,o.vertex); return o; }
fixed4 frag(v2f i) : SV_Target { // sample the texture fixed4 col = tex2D(_MainTex, i.uv) * _Color;
fixed shadow = SHADOW_ATTENUATION(i);
// darken light's illumination with shadow, keep ambient intact fixed3 lighting = i.diff * shadow + i.ambient; col.rgb *= lighting;
// apply fog UNITY_APPLY_FOG(i.fogCoord, col);
return col; } ENDCG }
// shadow caster rendering pass, implemented manually // using macros from UnityCG.cginc Pass { Tags{ "LightMode" = "ShadowCaster" }
CGPROGRAM #pragma vertex vert #pragma fragment frag #pragma multi_compile_shadowcaster #include "UnityCG.cginc"
struct v2f { V2F_SHADOW_CASTER; };
v2f vert(appdata_base v) { v2f o; TRANSFER_SHADOW_CASTER_NORMALOFFSET(o) return o; }
float4 frag(v2f i) : SV_Target { SHADOW_CASTER_FRAGMENT(i) } ENDCG }
} // SurShader
Fallback "Transparent/VertexLit"}