制作Unity瀑布着色器使用法线和噪波纹理创建泡沫边缘和向下流动的水相关知识。
着色器有一些额外的功能，具有深度边缘检测，如卡通风格化的水着色器，以及顶部的 WorldNormal 或基于顶点颜色的流向选项。
Waterfall.shader 代码：( 如果你使用的是较旧的Unity版本，并且遇到了 Toon Lit Tri Planar Normal 着色器的问题，瀑布显示为黑色纹理，请尝试第二段代码代替 )
Shader "FX/Waterfall" {
Properties {
[Space]
[Header(Water)]
_TColor ("Top Water Tint", Color) = (0,1,1,1)
_WaterColor ("Side Water Tint", Color) = (0,0.6,1,1)
_BrightNess ("Water Brightness", Range(0.5,2)) = 1.2
[Space]
[Header(Surface Noise and Movement)]
_SideNoiseTex ("Side Water Texture", 2D) = "white" {}
_TopNoiseTex ("Top Water Texture", 2D) = "white" {}
_HorSpeed ("Horizontal Flow Speed", Range(-4,4)) = 0.14
_VertSpeed("Vertical Flow Speed", Range(0,10)) = 6.8
_TopScale ("Top Noise Scale", Range(0,1)) = 0.4
_NoiseScale ("Side Noise Scale", Range(0,1)) = 0.04
[Toggle(VERTEX)] _VERTEX("Use Vertex Colors", Float) = 0
[Space]
[Header(Foam)]
_FoamColor ("Foam Tint", Color) = (1,1,1,1)
_Foam ("Edgefoam Width", Range(1,10)) = 2.35
_TopSpread("Foam Position", Range(0,6)) = 0.05
_Softness ("Foam Softness", Range(0,0.5)) = 0.1
_EdgeWidth("Foam Width", Range(0,2)) = 0.4
[Space]
[Header(Rim Light)]
[Toggle(RIM)] _RIM("Hard Rim", Float) = 0
_RimPower("Rim Power", Range(1,20)) = 18
_RimColor("Rim Color", Color) = (0,0.5,0.25,1)
}
SubShader {
Tags{ "Queue" = "Transparent"}
LOD 200
Blend SrcAlpha OneMinusSrcAlpha
CGPROGRAM
// Physically based Standard lighting model, and enable shadows on all light types
#pragma surface surf Standard vertex:vert fullforwardshadows keepalpha
// Use shader model 3.0 target, to get nicer looking lighting
#pragma target 3.0
#pragma shader_feature VERTEX
#pragma shader_feature RIM
sampler2D _SideNoiseTex, _TopNoiseTex;
uniform sampler2D _CameraDepthTexture; //Depth Texture
struct Input {
float3 worldNormal; INTERNAL_DATA// world normal built-in value
float3 worldPos; // world position built-in value
float3 viewDir;// view direction for rim
float4 color : COLOR; // vertex colors
float4 screenPos; // screen position for edgefoam
float eyeDepth;// depth for edgefoam
};
void vert (inout appdata_full v, out Input o)
{
UNITY_INITIALIZE_OUTPUT(Input, o);
COMPUTE_EYEDEPTH(o.eyeDepth);
}
fixed4 _FoamColor, _WaterColor, _RimColor, _TColor;
fixed _HorSpeed, _TopScale, _TopSpread, _EdgeWidth, _RimPower,_NoiseScale , _VertSpeed;
float _BrightNess, _Foam, _Softness;
void surf(Input IN, inout SurfaceOutputStandard o) {
// get the world normal
float3 worldNormal = WorldNormalVector(IN, o.Normal);
// grab the vertex colors from the model
float3 vertexColors = IN.color.rgb;
// normal for triplanar mapping
float3 blendNormal = saturate(pow(worldNormal * 1.4,4));
#if VERTEX // use vertex colors for flow
float3 flowDir= (vertexColors * 2.0f) - 1.0f;
#else // or world normal
float3 flowDir= -(worldNormal * 2.0f) - 1.0f;
#endif
// horizontal flow speed
flowDir *= _HorSpeed;
// flowmap blend timings
float timing = frac(_Time.y * 0.5f + 0.5f);
float timing2 = frac(_Time.y* 0.5f);
float timingLerp = abs((0.5f - timing) / 0.5f);
// move 2 textures at slight different speeds fased on the flowdirection
half3 topTex1 = tex2D(_TopNoiseTex, IN.worldPos.xz * _TopScale + (flowDir.xz * timing));
half3 topTex2 = tex2D(_TopNoiseTex, IN.worldPos.xz * _TopScale + (flowDir.xz * timing2));
// vertical flow speed
float vertFlow = _Time.y * _VertSpeed;
// noise sides
float3 TopFoamNoise = lerp(topTex1, topTex2, timingLerp);
float3 SideFoamNoiseZ = tex2D(_SideNoiseTex, float2(IN.worldPos.z* 10, IN.worldPos.y + vertFlow) * _NoiseScale );
float3 SideFoamNoiseX = tex2D(_SideNoiseTex, float2(IN.worldPos.x* 10, IN.worldPos.y + vertFlow) * _NoiseScale);
// lerped together all sides for noise texture
float3 noisetexture = SideFoamNoiseX;
noisetexture = lerp(noisetexture, SideFoamNoiseZ, blendNormal.x);
noisetexture = lerp(noisetexture, TopFoamNoise, blendNormal.y);
// add noise to normal
o.Normal *= noisetexture;
// edge foam calculation
half depth = LinearEyeDepth(SAMPLE_DEPTH_TEXTURE_PROJ(_CameraDepthTexture , UNITY_PROJ_COORD(IN.screenPos))); // depth
half4 foamLine =1 - saturate(_Foam * float4(noisetexture,1) * (depth - IN.screenPos.w));// foam line by comparing depth and screenposition
// rimline
#if RIM
int rim = 1.0 - saturate(dot(normalize(IN.viewDir) , o.Normal));
#else
half rim = 1.0 - saturate(dot(normalize(IN.viewDir) , o.Normal));
#endif
float3 colorRim = _RimColor.rgb * pow (rim, _RimPower);
// Normalbased Foam
float worldNormalDotNoise = dot(o.Normal , worldNormal.y);
float3 foam = (smoothstep(_TopSpread, _TopSpread + _Softness, worldNormalDotNoise) * smoothstep(worldNormalDotNoise,worldNormalDotNoise + _Softness, _TopSpread + _EdgeWidth));
// combine depth foam and foam + add color
float3 combinedFoam = (foam + foamLine.rgb) * _FoamColor;
// colors lerped over blendnormal
float4 color = lerp(_WaterColor, _TColor, blendNormal.y) * _BrightNess;
o.Albedo = color;
// glowing combined foam and colored rim
o.Emission = combinedFoam + colorRim ;
// clamped alpha
o.Alpha = clamp(color.a + combinedFoam + foamLine.a, 0, 1);
}
ENDCG
}
FallBack "Diffuse"
}如果你使用的是较旧的Unity版本，并且遇到了 Toon Lit Tri Planar Normal 着色器的问题，瀑布显示为黑色纹理，请尝试使用此代码代替。
OlderUnityVersions.shader 代码：
Shader "FX/Waterfall" {
Properties {
[Space]
[Header(Water)]
_TColor ("Top Water Tint", Color) = (0,1,1,1)
_WaterColor ("Side Water Tint", Color) = (0,0.6,1,1)
_BrightNess ("Water Brightness", Range(0.5,2)) = 1.2
[Space]
[Header(Surface Noise and Movement)]
_SideNoiseTex ("Side Water Texture", 2D) = "white" {}
_TopNoiseTex ("Top Water Texture", 2D) = "white" {}
_HorSpeed ("Horizontal Flow Speed", Range(-4,4)) = 0.14
_VertSpeed("Vertical Flow Speed", Range(0,10)) = 6.8
_TopScale ("Top Noise Scale", Range(0,1)) = 0.4
_NoiseScale ("Side Noise Scale", Range(0,1)) = 0.04
[Toggle(VERTEX)] _VERTEX("Use Vertex Colors", Float) = 0
[Space]
[Header(Foam)]
_FoamColor ("Foam Tint", Color) = (1,1,1,1)
_Foam ("Edgefoam Width", Range(1,10)) = 2.35
_TopSpread("Foam Position", Range(0,6)) = 0.05
_Softness ("Foam Softness", Range(0,0.5)) = 0.1
_EdgeWidth("Foam Width", Range(0,2)) = 0.4
[Space]
[Header(Rim Light)]
[Toggle(RIM)] _RIM("Hard Rim", Float) = 0
_RimPower("Rim Power", Range(1,20)) = 18
_RimColor("Rim Color", Color) = (0,0.5,0.25,1)
}
SubShader {
Tags{ "Queue" = "Transparent"}
LOD 200
Blend SrcAlpha OneMinusSrcAlpha
CGPROGRAM
// Physically based Standard lighting model, and enable shadows on all light types
#pragma surface surf Standard vertex:vert fullforwardshadows keepalpha
// Use shader model 3.0 target, to get nicer looking lighting
#pragma target 3.0
#pragma shader_feature VERTEX
#pragma shader_feature RIM
sampler2D _SideNoiseTex, _TopNoiseTex;
uniform sampler2D _CameraDepthTexture; //Depth Texture
struct Input {
INTERNAL_DATA// world normal built-in value
float3 worldPos; // world position built-in value
float3 viewDir;// view direction for rim
float4 color : COLOR; // vertex colors
float4 screenPos; // screen position for edgefoam
float eyeDepth;// depth for edgefoam
float3 wNormal;
};
void vert (inout appdata_full v, out Input o)
{
UNITY_INITIALIZE_OUTPUT(Input, o);
COMPUTE_EYEDEPTH(o.eyeDepth);
o.wNormal = mul((float3x3)unity_ObjectToWorld, v.normal);
}
fixed4 _FoamColor, _WaterColor, _RimColor, _TColor;
fixed _HorSpeed, _TopScale, _TopSpread, _EdgeWidth, _RimPower,_NoiseScale , _VertSpeed;
float _BrightNess, _Foam, _Softness;
void surf(Input IN, inout SurfaceOutputStandard o) {
// get the world normal
//IN.worldNormal =
// grab the vertex colors from the model
float3 vertexColors = IN.color.rgb;
// normal for triplanar mapping
float3 blendNormal = saturate(pow((IN.wNormal) * 1.4,4));
#if VERTEX // use vertex colors for flow
float3 flowDir= (vertexColors * 2.0f) - 1.0f;
#else // or world normal
float3 flowDir= -(IN.wNormal * 2.0f) - 1.0f;
#endif
// horizontal flow speed
flowDir *= _HorSpeed;
// flowmap blend timings
float timing = frac(_Time.y * 0.5f + 0.5f);
float timing2 = frac(_Time.y* 0.5f);
float timingLerp = abs((0.5f - timing) / 0.5f);
// move 2 textures at slight different speeds fased on the flowdirection
half3 topTex1 = tex2D(_TopNoiseTex, IN.worldPos.xz * _TopScale + (flowDir.xz * timing));
half3 topTex2 = tex2D(_TopNoiseTex, IN.worldPos.xz * _TopScale + (flowDir.xz * timing2));
// vertical flow speed
float vertFlow = _Time.y * _VertSpeed;
// noise sides
float3 TopFoamNoise = lerp(topTex1, topTex2, timingLerp);
float3 SideFoamNoiseZ = tex2D(_SideNoiseTex, float2(IN.worldPos.z* 10, IN.worldPos.y + vertFlow) * _NoiseScale );
float3 SideFoamNoiseX = tex2D(_SideNoiseTex, float2(IN.worldPos.x* 10, IN.worldPos.y + vertFlow) * _NoiseScale);
// lerped together all sides for noise texture
float3 noisetexture = SideFoamNoiseX;
noisetexture = lerp(noisetexture, SideFoamNoiseZ, blendNormal.x);
noisetexture = lerp(noisetexture, TopFoamNoise, blendNormal.y);
// add noise to normal
o.Normal += noisetexture;
// edge foam calculation
half depth = LinearEyeDepth(SAMPLE_DEPTH_TEXTURE_PROJ(_CameraDepthTexture , UNITY_PROJ_COORD(IN.screenPos))); // depth
half4 foamLine =1 - saturate(_Foam * float4(noisetexture,1) * (depth - IN.screenPos.w));// foam line by comparing depth and screenposition
// rimline
#if RIM
int rim = 1.0 - saturate(dot(normalize(IN.viewDir) , o.Normal));
#else
half rim = 1.0 - saturate(dot(normalize(IN.viewDir) , o.Normal));
#endif
float3 colorRim = _RimColor.rgb * pow (rim, _RimPower);
// Normalbased Foam
float worldNormalDotNoise = dot(o.Normal , IN.wNormal.y);
float3 foam = (smoothstep(_TopSpread, _TopSpread + _Softness, worldNormalDotNoise) * smoothstep(worldNormalDotNoise,worldNormalDotNoise + _Softness, _TopSpread + _EdgeWidth));
// combine depth foam and foam + add color
float3 combinedFoam = (foam + foamLine.rgb) * _FoamColor;
// colors lerped over blendnormal
float4 color = lerp(_WaterColor, _TColor, blendNormal.y) * _BrightNess;
o.Albedo = color;
// glowing combined foam and colored rim
o.Emission = combinedFoam + colorRim ;
// clamped alpha
o.Alpha = clamp(color.a + combinedFoam + foamLine.a, 0, 1);
}
ENDCG
}
FallBack "Diffuse"
}噪波纹理：
