unity贴花实现

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89

Shader "Decal" {     Properties     {         _MainTex ("Texture", 2D) = "white" {}         _MixedColor("MixedColor",Color)=(1,1,1,1) //颜色混合         _Alpha ("Alpha",Range(0,1.0)) = 1 //透明度     }     SubShader     {         Tags {             "RenderType"="Opaque"             "Queue" = "Geometry+1"         }         LOD 100                   ZWrite Off         ZTest Off         Cull Front                           Blend SrcAlpha OneMinusSrcAlpha                   Pass         {             CGPROGRAM             #pragma vertex vert             #pragma fragment frag               #include "UnityCG.cginc"               struct appdata             {                 float4 vertex : POSITION;                 float2 uv : TEXCOORD0;             };               struct v2f             {                 float2 uv : TEXCOORD0;                 float4 vertex : SV_POSITION;                 float4 screenPos : TEXCOORD1;             };               sampler2D _MainTex;             float _Alpha;             float4 _MainTex_ST;             float4 _MixedColor;             sampler2D _CameraDepthTexture;               v2f vert (appdata v)             {                 v2f o;                 o.vertex = UnityObjectToClipPos(v.vertex);                 o.uv = TRANSFORM_TEX(v.uv, _MainTex);                                   o.screenPos = ComputeScreenPos(o.vertex);                 return o;             }               float3 DepthToWorldPosition(float4 screenPos)             {                 float depth = Linear01Depth(UNITY_SAMPLE_DEPTH(tex2Dproj(_CameraDepthTexture,screenPos)));                 float4 ndcPos = (screenPos/screenPos.w) * 2 - 1;                 float3 clipPos = float3(ndcPos.x,ndcPos.y,1) * _ProjectionParams.z;                 float3 viewPos = mul(unity_CameraInvProjection,clipPos.xyzz).xyz * depth;                 float3 worldPos = mul(UNITY_MATRIX_I_V,float4(viewPos,1)).xyz;                 return worldPos;             }             //颜色混合             float4 MixedColor(float4 a,float4 b)             {                 return float4(a.r*b.r,a.g*b.g,a.b*b.b,a.a*b.a);             }             fixed4 frag (v2f i) : SV_Target             {                 float3 worldPos = DepthToWorldPosition(i.screenPos);                 float4 localPos = mul(unity_WorldToObject,float4(worldPos,1.0));                 clip(float3(0.5,0.5,0.5) - abs(localPos.xyz));                 fixed2 decalUV = fixed2(localPos.x,localPos.z);                 decalUV = decalUV + 0.5;                 fixed4 color = tex2D(_MainTex,decalUV);                 fixed4 c=fixed4(color.r,color.g,color.b,color.a*_Alpha);                 return MixedColor(c,_MixedColor);             }                          ENDCG         }     } }