前言

上一节生成了岸边的泡沫。本节主要梳理水表面的上色过程，这部分涉及半透明渲染和fresnel颜色

颜色

float waterDepth = _getNewDepthMask(RawDepth, _DepthRange);

fig1

图1所示，白色为浅水部分，黑色为深水部分。用lerp后的结果如下

其次，加入fresnel的颜色

这段代码为

// =========Fresnel=========== //real4 base_col = lerp(_DeepCol, _ShallowCol, waterDepth);float F = _getfresnelMask(normalW, viewW);base_col = lerp(base_col, _FresnelCol, F);

半透明

将RenderType从不透明模式改为半透明模式，之后，颜色的alpha通道能够改变mesh的透明度。同样透明度有depth相关的变量控制

Tags {"RenderPipeline"="UniversalRenderPipeline""RenderType"="Transparent" "Queue" = "Transparent""IgnoreProjector"="True"}Tags {"LightMode"="UniversalForward"}Blend SrcAlpha OneMinusSrcAlphaZWrite Off

地面换上了之前所做的沙漠纹理

加入上一节的岸边泡沫

目前的片元部分的代码：

real4 frag(v2f i) : SV_TARGET{// =========Get necessity=========== //float3 PosW = i.posW;float3 normalW = i.normalW;float3 viewW = i.viewDirW;float4 screenPos = i.scrPos / i.scrPos.w;// screenPos.z = (UNITY_NEAR_CLIP_VALUE >=0)?screenPos.z:screenPos.z* 0.5 + 0.5;float sceneRawDepth = SAMPLE_DEPTH_TEXTURE(_CameraDepthTexture, sampler_CameraDepthTexture,screenPos.xy);float3 worldPos = ComputeWorldSpacePosition(screenPos.xy, sceneRawDepth, UNITY_MATRIX_I_VP);float RawDepth = PosW.y-worldPos.y;float waterDepth = _getNewDepthMask(RawDepth, _DepthRange);// =========Foam=========== //float FoamDepth = smoothstep(_FoamBlend, 1, RawDepth);float wave_noise = SAMPLE_TEXTURE2D(_FoamNoiseMap, sampler_FoamNoiseMap, i.uv.xy).r* _FoamNoiseStr;real4 sinWave = _getFoamWave(RawDepth, wave_noise) * _FoamCol;// =========Fresnel=========== //real4 base_col = lerp(_DeepCol, _ShallowCol, waterDepth);float F = _getfresnelMask(normalW, viewW);base_col = lerp(base_col, _FresnelCol, F);// =========Mix Results=========== //base_col = lerp(base_col, base_col+sinWave, sinWave.a);// return float4(base_col.xyz, 1);return base_col;}