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Assets/Art/ParallaxCloud/Material/ParallaxCloud.mat

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Assets/Art/ParallaxCloud/Prefabs/ParallaxCloud.prefab.meta

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Assets/Art/ParallaxCloud/Shader.meta

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Assets/Art/ParallaxCloud/Shader/ParallaxCloud.shader

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+Shader "Custom/ParallaxCloud"
+{
+    Properties
+    {
+        _MainTex        ("BaseMap：基础贴图", 2D) = "white" {}
+        _Color          ("Color：颜色", Color) = (0.0, 0.0, 0.0, 1.0)
+        _ParallaxSize   ("ParallaxSize：视差映射强度", Range(0.0, 0.1)) = 0.0
+        _ParallaxLayers ("ParallaxLayers：视差映射层数",  Range(1.0, 50.0)) = 20
+        _MoveSpeed      ("MoveSpeed：移动速度", Range(-0.5, 0.5)) = 0.1
+        _Alpha          ("Alpha：透明度", Range(0, 1)) = 0.5
+        _AlphaExtent    ("AlphaExtent：透明对比度", Range(0.0, 5.0)) = 5.0
+    }
+    
+    SubShader
+    {
+        Tags       
+        { 
+            "RenderPipeline"="UniversalPipeline"
+            "Queue"="Transparent"
+            "RenderType"="Transparent"
+        }
+
+        Pass
+        {
+            Blend SrcAlpha OneMinusSrcAlpha
+            Cull off
+            
+            HLSLPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+            #include "Packages/com.unity.render-pipelines.core/ShaderLibrary/Color.hlsl"
+            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Lighting.hlsl"
+            
+            struct Attributes
+            {
+                float4 positionOS : POSITION;
+                float3 normalOS   : NORMAL;
+                float2 uv         : TEXCOORD0;
+                float4 tangent    : TANGENT;
+            };
+
+            struct Varyings
+            {
+                float4 positionCS : SV_POSITION;
+                float3 positionWS : TEXCOORD0;
+                float4 uv         : TEXCOORD1;
+                float3 nDirWS     : TEXCOORD2;
+                float3 tDirWS     : TEXCOORD3;
+                float3 bDirWS     : TEXCOORD4;
+            };
+
+            CBUFFER_START(UnityPerMaterial)
+            half4 _MainTex_ST;
+            half4 _Color;
+            half _ParallaxSize;
+            half _ParallaxLayers;
+            half _MoveSpeed;
+            half _Alpha;
+            half _AlphaExtent;
+            CBUFFER_END
+            TEXTURE2D(_MainTex); SAMPLER(sampler_MainTex);
+            TEXTURE2D(_NormalTex); SAMPLER(sampler_NormalTex);
+            TEXTURE2D(_ParallaxTex); SAMPLER(sampler_ParallaxTex);
+            
+            Varyings vert (Attributes v)
+            {
+                Varyings o;
+                o.positionCS = TransformObjectToHClip(v.positionOS.xyz);
+                o.positionWS = TransformObjectToWorld(v.positionOS.xyz);
+                o.nDirWS  = TransformObjectToWorldNormal(v.normalOS);
+                o.tDirWS = normalize(TransformObjectToWorld(v.tangent.xyz));
+                o.bDirWS = normalize(cross(o.nDirWS, o.tDirWS) * v.tangent.w);
+                o.uv.xy = TRANSFORM_TEX(v.uv, _MainTex) + float2(frac(_Time.y * _MoveSpeed), 0.0);
+                o.uv.zw = v.uv;
+                return o;
+            }
+
+            half4 frag (Varyings i) : SV_Target
+            {
+                //Light mylight = GetMainLight();
+                //half3 light = mylight.color;
+                float3x3 TBN = float3x3(i.tDirWS, i.bDirWS, i.nDirWS);
+                float3 vDir = normalize(i.positionWS - _WorldSpaceCameraPos.xyz);
+                float3 vDirTS = mul(TBN, vDir);
+                
+                float3 var_MainTex = SAMPLE_TEXTURE2D(_MainTex,sampler_MainTex,i.uv.zw).rgb;
+                
+                half2 offset = 0.0;
+                half currentDepth = 0.0;
+                half parallaxDepth = 0.0;
+                half preParallaxDepth = 0.0;
+                half heightStep = 1.0 / _ParallaxLayers;
+                half2 offsetTemp = vDirTS.xy / -vDirTS.z * _ParallaxSize;
+                for (int j = 0; j < _ParallaxLayers; j++)
+                {
+                    parallaxDepth = 1.0 - SAMPLE_TEXTURE2D_LOD(_MainTex, sampler_MainTex, i.uv.xy + offset, 0).r * var_MainTex.r;
+                    if (currentDepth > parallaxDepth) break;
+                    preParallaxDepth = parallaxDepth;
+                    currentDepth += heightStep;
+                    offset = offsetTemp * currentDepth;
+                }
+                half preDepth = currentDepth - heightStep;
+                half A_C = preDepth - preParallaxDepth;
+                half D_B = parallaxDepth - currentDepth;
+                half t = A_C / (D_B + A_C);
+                half height = lerp(preDepth, currentDepth, t);
+                offset += offsetTemp * height;
+                i.uv.xy += offset;
+                
+                half3 finalColor = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.uv.xy).rgb * var_MainTex.rgb;
+                float alphaTex = max(var_MainTex.r * finalColor.r,0.0);
+                half alpha = max(pow(abs(lerp(alphaTex, 1.0, _Alpha)), _AlphaExtent), 0.0) * _Alpha;
+                return half4(finalColor * _Color.rgb, alpha);
+            }
+            ENDHLSL
+        }
+    }
+}

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