室外玻璃幕墙Shader

王者再临

老外分享的一个shader，做建筑虚拟可以用下

1. Shader "Building/Glass" {
   
2. Properties {
   
3. 
   
4. _Lightmap ("Lightmap (RGB) Reflectiveness (A)", 2D) = "black" {}
   
5. 
   
6. _Color ("Main Color", Color) = (1,1,1,1)
   
7. 
   
8. _Cube ("Reflection Cubemap", Cube) = "" { TexGen CubeReflect }
   
9. 
   
10. }
    
11. 
    
12. Category {
    
13. 
    
14. Tags { "Queue" = "Transparent-110" }
    
15. 
    
16. Blend SrcAlpha OneMinusSrcAlpha
    
17. 
    
18. Lighting Off
    
19. 
    
20. Colormask RGB
    
21. 
    
22. // ---- fragment program cards
    
23. 
    
24. SubShader {
    
25. 
    
26. Pass {
    
27. 
    
28. CGPROGRAM
    
29. 
    
30. #pragma vertex vert
    
31. 
    
32. #pragma fragment frag
    
33. 
    
34. #pragma fragmentoption ARB_fog_exp2
    
35. 
    
36. #pragma fragmentoption ARB_precision_hint_fastest
    
37. 
    
38. #include "UnityCG.cginc"
    
39. 
    
40. struct v2f {
    
41. 
    
42. V2F_POS_FOG;
    
43. 
    
44. float3 normal;
    
45. 
    
46. float3 viewDir;
    
47. 
    
48. float3 rotNormal;
    
49. 
    
50. float2 uv;
    
51. 
    
52. };
    
53. 
    
54. uniform float4x4 _RotMatrix;
    
55. 
    
56. uniform float4 _Lightmap_ST;
    
57. 
    
58. v2f vert (appdata_tan v)
    
59. 
    
60. {
    
61. 
    
62. v2f o;
    
63. 
    
64. PositionFog( v.vertex, o.pos, o.fog );
    
65. 
    
66. o.normal = mul( (float3x3)_Object2World, v.normal );
    
67. 
    
68. o.rotNormal = mul( (float3x3)_RotMatrix, o.normal );
    
69. 
    
70. o.viewDir = mul( (float3x3)_Object2World, ObjSpaceViewDir(v.vertex) );
    
71. 
    
72. o.uv = TRANSFORM_TEX(v.texcoord, _Lightmap);
    
73. 
    
74. return o;
    
75. 
    
76. }
    
77. 
    
78. uniform samplerCUBE _Cube;
    
79. 
    
80. uniform float4 _Color;
    
81. 
    
82. uniform sampler2D _Lightmap;
    
83. 
    
84. float4 frag (v2f i) : COLOR
    
85. 
    
86. {
    
87. 
    
88. float3 normal = i.normal;
    
89. 
    
90. i.viewDir = normalize(i.viewDir);
    
91. 
    
92. half nsv = saturate(dot( normal, i.viewDir ));
    
93. 
    
94. // calculate reflection vector in world space
    
95. 
    
96. half3 r = reflect(-i.viewDir, i.rotNormal);
    
97. 
    
98. half4 lightmapColor = tex2D(_Lightmap, i.uv);
    
99. 
    
100. half4 reflcolor = texCUBE(_Cube, r);
     
101. 
     
102. half fresnel = 1 - nsv*0.5;
     
103. 
     
104. half fresnelAlpha = 1 - nsv * (1 - _Color.a);
     
105. 
     
106. half4 c = half4( lerp( _Color.rgb, reflcolor.rgb, fresnel * lightmapColor.a ), fresnelAlpha );
     
107. 
     
108. c.rgb *= lightmapColor.rgb;
     
109. 
     
110. return c;
     
111. 
     
112. }
     
113. 
     
114. ENDCG
     
115. 
     
116. }
     
117. 
     
118. }
     
119. 
     
120. // ---- cards that can do cube maps
     
121. 
     
122. SubShader {
     
123. 
     
124. Pass {
     
125. 
     
126. SetTexture [_Cube] { matrix[_RotMatrix] constantColor(1,1,1,0.5) combine texture, constant }
     
127. 
     
128. }
     
129. 
     
130. }
     
131. 
     
132. // ---- cards that can't do anything
     
133. 
     
134. SubShader {
     
135. 
     
136. Pass {
     
137. 
     
138. Color (1,1,1,0.3)
     
139. 
     
140. }
     
141. 
     
142. }
     
143. 
     
144. }
     
145. 
     
146. }

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