这个Unity特效严格意义上讲并不是一个真正的线框着色器，但它是一个技巧，一个可以帮助大家延伸思维的内容。
图中它将网格将被顶点位移分割，并且通过向背面添加颜色，线框效果是非常酷的。
该效果在 Shader Graph 中完成，有关更深入的信息，请查看带注释的代码。
该效果不会真正适用于平滑法线，大家可以在 Unity 中网格的导入设置中将法线设置为硬。
此外，还需要在相机上启用 DepthTexture
示例设置：
带注释的代码：
Shader "Custom/GlitchWireframeEffect"
{
Properties
{
[Header(Vertex Displacement)]
_Intensity ("Vertex Intensity", Range(0,1)) = 0.3
_Width("Pulse Width", Range(0,1)) = 0.5
_PulseFreq("Pulse Freq", Range(0,1)) = 0.2
_Scale("Pulse Scale", Range(0,5)) = 2
_Speed("Speed", Range(-5,5)) = 0.3
_Random("Random Offset", Range(0,5)) = 0.0
[Header(Tinting)]
_TintingBrightness("Tinting Brightness", Range(0,5)) = 1.0
_Stretch("Stretch Tinting Gradient", Range(0,5)) = 2
_Tinting("Albedo Tinting", Color) = (0,0,1,1)
_Tinting2("Albedo Tinting 2", Color) = (0,0,0,1)
[Header(Backfaces)]
_Brightness ("Backface Brightness", Range(0,5)) = 4
_BackfaceCol ("Backface Color", Color) = (0,0.5,1,1)
_BackfaceCol2 ("Backface Color2", Color) = (0,1,1,1)
_StretchBackface("Stretch BackFace Gradient", Range(0,5)) = 0.0
[Header(Rim)]
_RimBrightness("Rim Brightness", Range(0,20)) = 5
_RimPower("RImPOwer", Range(0,20)) = 10
_StretchRim("Stretch Rim Gradient", Range(0,5)) = 2
_RimCol ("Rim Color", Color) = (1,0,1,1)
_RimCol2 ("Rim Color 2", Color) = (1,1,1,1)
[Header(Other)]
_Clipping("Front Face Clipping", Range(0,1)) = 0.0
_Distortion("Distortion", Range(0,1)) = 0.2
}
SubShader
{
Tags { "RenderType"="Opaque" "Queue"="Geometry+2"}
LOD 200
Cull Off
GrabPass { "_GrabTex" }
CGPROGRAM
#include "UnityCG.cginc"
// Physically based Standard lighting model, and enable shadows on all light types
#pragma surface surf Simple vertex:vert addshadow
// Use shader model 3.0 target, to get nicer looking lighting
#pragma target 4.0
sampler2D _GrabTex;
float4 _GrabTex_TexelSize;
#pragma lighting Simple exclude_path:prepass
inline half4 LightingSimple(SurfaceOutput s, half3 lightDir, half atten)
{
half4 c;
c.rgb = s.Albedo * _LightColor0.rgb *atten;
c.a = s.Alpha;
return c;
}
struct Input
{
float4 screenPos;
float facing : VFACE;
float3 viewDir;
float3 worldPos;
float glitchPosFront;
float glitchPos;
};
fixed4 _BackfaceCol2, _BackfaceCol;
fixed4 _Tinting, _Tinting2;
fixed4 _RimCol,_RimCol2;
float _Intensity,_Width, _PulseFreq;
float _Stretch, _StretchBackface, _StretchRim;
float _Random,_Scale,_Speed;
float _Brightness,_TintingBrightness,_RimBrightness;
float _RimPower;
sampler2D _CameraDepthTexture;
float _Distortion;
float _Clipping;
float rand(float n)
{
return frac(sin(n) * 43758.5453123);
}
void vert (inout appdata_full v, out Input o)
{
UNITY_INITIALIZE_OUTPUT (Input, o);
// vertex y position, with optional randomness
float randomPos = (rand(v.texcoord.x) * _Random ) + (v.vertex.y * _Scale);
float moveSpeed = _Time.y * _Speed;
// repeat position on model, and move it up/down
float glitchPos = frac((randomPos +moveSpeed ) * _PulseFreq) ;// position on model
// clamp the width with a smoothstep
float glitchPosClamped = smoothstep(glitchPos , glitchPos + 1, _Width );
// only split on the camera viewing part
float3 viewDir = normalize(ObjSpaceViewDir(v.vertex));
float frontFacing =saturate(dot(normalize(v.normal), normalize(viewDir))) ;
frontFacing = step(0.1, frontFacing);
// move vertices outward based on the glitchy position
v.vertex.xyz += (glitchPosClamped * normalize(v.normal)) * _Intensity * frontFacing;
// send positions through to the fragment function
o.glitchPos = glitchPos;
o.glitchPosFront = glitchPosClamped* frontFacing;
}
// Add instancing support for this shader. You need to check 'Enable Instancing' on materials that use the shader.
// See https://docs.unity3d.com/Manual/GPUInstancing.html for more information about instancing.
// #pragma instancing_options assumeuniformscaling
UNITY_INSTANCING_BUFFER_START(Props)
// put more per-instance properties here
UNITY_INSTANCING_BUFFER_END(Props)
float3 GetFaceNormal(float3 position) {
float3 dx = ddx(position);
float3 dy = ddy(position);
return normalize(cross(dy, dx));
}
void surf (Input IN, inout SurfaceOutput o)
{
// grabtex uv
float2 uv = IN.screenPos.xy / IN.screenPos.w;
// get an evened out facenormal, will make the distortions move more with the vertex movement
float3 faceNormal = GetFaceNormal(IN.worldPos.xyz);
// distorted uv
float2 distortedUV = lerp(uv, (faceNormal + uv) * 0.5, _Distortion) ;
// grabtex
float4 grabPassTex = tex2D (_GrabTex, distortedUV );
//base albedo is the grabtex
o.Albedo = grabPassTex.rgb ;
// backfaces colors, lerped over glitchpos
float3 backGlitchCol = lerp(_BackfaceCol2, _BackfaceCol, saturate(IN.glitchPos* _StretchBackface));
// tinted grabtex colors, lerped over glitchpos
float3 albedoTinting = lerp( _Tinting, _Tinting2,saturate(IN.glitchPos* _Stretch));
albedoTinting *= grabPassTex.rgb;
// add tinting
o.Albedo += (albedoTinting * _TintingBrightness) ;
// use vface to only add color to the front faces
o.Albedo = (IN.facing>0) ? o.Albedo : 0;
// create a rim
float Rim = 1.0 - saturate(dot(normalize(faceNormal), normalize(IN.viewDir)));
float softRim = pow(Rim, _RimPower) ;
// color rim based on glitchpos
float3 rimCol = lerp(_RimCol, _RimCol2, saturate(IN.glitchPos * _StretchRim) );
// rimcol on frontfacing, backglithcol on backfacing
o.Emission = ((IN.facing>0) ? ( rimCol * _RimBrightness) * softRim: backGlitchCol * _Brightness ) ;
// clip front to show into the mesh more
clip( ((1-IN.glitchPosFront)- _Clipping));
o.Alpha = 1;
}
ENDCG
}
FallBack "Diffuse"
}
这个可以有