升级到Unity 5.5后轮廓着色器破损

Question

着色器在iPad Air上的统一性5.4上工作正常，但在升级到统一5.5后，它突破了轮廓，但alpha仍在工作。

此着色器对象支持纹理和α-

Shader "TFTM/Outline/Basic-Alpha" { 
Properties { 
    _Color ("Main Color", Color) = (.5,.5,.5,1) 
    _MainTex ("Base (RGB)", 2D) = "white" {} 
} 


SubShader { 
    Tags { "RenderType"="Opaque" "Queue"="Transparent" } 
    Pass { 
     Name "BASE" 
     Blend SrcAlpha OneMinusSrcAlpha 
     //Blend DstColor SrcColor 
     CGPROGRAM 
     #pragma vertex vert 
     #pragma fragment frag 
     #pragma fragmentoption ARB_precision_hint_fastest 
     #include "UnityCG.cginc" 
     sampler2D _MainTex; 
     float4 _MainTex_ST; 
     float4 _Color; 
     struct appdata { 
      float4 vertex : POSITION; 
      float2 texcoord : TEXCOORD0; 
      float3 normal : NORMAL; 
     }; 

     struct v2f { 
      float4 pos : POSITION; 
      float2 texcoord : TEXCOORD0; 
     }; 
     v2f vert (appdata v) 
     { 
      v2f o; 
      o.pos = mul (UNITY_MATRIX_MVP, v.vertex); 
      o.texcoord = TRANSFORM_TEX(v.texcoord, _MainTex); 
      return o; 
     } 
     float4 frag (v2f i) : COLOR 
     { 
      float4 col = _Color * tex2D(_MainTex, i.texcoord); 
      return float4(2.0f * col.rgb, col.a); 
     } 
     ENDCG    
    } 
} 
SubShader { 
    Tags { "RenderType"="Opaque" "Queue"="Transparent"} 
    Pass { 
     Name "BASE" 
     SetTexture [_MainTex] { 
      constantColor [_Color] 
      Combine texture * constant 
     } 
    } 
} 

Fallback "VertexLit" 
} 

此着色器轮廓，2通，上述着色器第一次拉伸，然后绘制轮廓和剔除前面。

Shader "TFTM/Outline/Basic Outline-Alpha" { 
    Properties { 
     _Color ("Main Color", Color) = (.5,.5,.5,1) 
     _OutlineColor ("Outline Color", Color) = (0,0,0,1) 
     _Outline ("Outline width", Range (0, 0.02)) = 0 
     _MainTex ("Base (RGB)", 2D) = "white" { } 
    } 

CGINCLUDE 
#include "UnityCG.cginc" 

struct appdata { 
    float4 vertex : POSITION; 
    float3 normal : NORMAL; 
}; 
struct v2f { 
    float4 pos : POSITION; 
    float4 color : COLOR; 
}; 

uniform float _Outline; 
uniform float4 _OutlineColor; 

v2f vert(appdata v) { 
    v2f o; 
    o.pos = mul(UNITY_MATRIX_MVP, v.vertex); 
    float3 norm = mul ((float3x3)UNITY_MATRIX_IT_MV, v.normal); 
    float2 offset = TransformViewToProjection(norm.xy); 
    o.pos.xy += offset * o.pos.z * _Outline; 
    o.color = _OutlineColor; 
    return o; 
} 
ENDCG 
SubShader { 
    Tags { "RenderType"="Opaque" "Queue"="Transparent" } 
    UsePass "TFTM/Outline/Basic-Alpha/BASE" 
    Pass { 
     Name "OUTLINE" 
     Tags { "LightMode" = "Always" } 
     Cull Front 
     ZWrite On 
     ColorMask RGB 
     Blend DstColor SrcColor // 2x Multiplicative 
     CGPROGRAM 
     #pragma vertex vert 
     #pragma fragment frag 
     half4 frag(v2f i) :COLOR { return i.color ; } 
     ENDCG 
    } 
} 

SubShader { 
    Tags { "RenderType"="Opaque" "Queue"="Transparent"} 
    UsePass "TFTM/Outline/Basic-Alpha/BASE" 
    Pass { 
     Name "OUTLINE" 
     Tags { "LightMode" = "Always" } 
     Cull Front 
     ZWrite On 
     ColorMask RGB 
     Blend DstColor SrcColor // 2x Multiplicative 
     CGPROGRAM 
     #pragma vertex vert 
     #pragma exclude_renderers shaderonly 
     ENDCG 
     SetTexture [_MainTex] { combine primary } 
    } 
} 

Fallback "TFTM/Outline/Basic-Alpha" 
} 

Answer 1

我通过改变API渲染OpenGL ES 3而不是Metal修复它，但当然这是一个临时的解决办法现在。

Answer 2

o.pos.xy += offset * o.pos.z * _Outline; 

o.pos.z因具体平台而异。 https://docs.unity3d.com/Manual/SL-PlatformDifferences.html

所以，你不能用它来缩放轮廓。

o.pos.z的目的是不管距离如何保持轮廓大小恒定。

现在，我们想要的是基于相机z轴的刻度值。

float eye_depth; 
// This depth is based on camera's z axis 
COMPUTE_EYEDEPTH(eye_depth); 
// Divided by near plane. This is similar triangle math. 
float eye_depth_scale = eye_depth/_ProjectionParams.y; 
o.pos.xy += offset * eye_depth_scale * _Outline; 

您可能想要限制eye_depth以防止缩放比例太大。