Unity导入模型贴图一面透明

出现这种情况是因为模型用了双面材质，而Unity不支持双面材质。故导入模型到Unity中，会出现一面有贴图，另一面透明的情况。

解决方法：新建一个Shader，代码如下：

Shader "MyShader/Text" {
Properties { 
_Color ("Main Color", Color) = (1,1,1,0) 
_SpecColor ("Spec Color", Color) = (1,1,1,1) 
_Emission ("Emmisive Color", Color) = (0,0,0,0) 
_Shininess ("Shininess", Range (0.01, 1)) = 0.7 
_FrontTex ("Front (RGB)", 2D) = "white" { } 
_BackTex ("Back (RGB)", 2D) = "white" { } 
} 
SubShader { 
Material { 
Diffuse [_Color] 
Ambient [_Color] 
Shininess [_Shininess] 
Specular [_SpecColor] 
Emission [_Emission] 
} 
Lighting On 
SeparateSpecular On 
Blend SrcAlpha OneMinusSrcAlpha 
Pass { 
Cull Front 
SetTexture [_BackTex] { 
Combine Primary * Texture 
} 
} 
Pass { 
Cull Back 
SetTexture [_FrontTex] { 
Combine Primary * Texture 
}}}}