Unity 5 Surface Shaders and Realtime Shadows issue

Hi there,

Testing Surface Shaders with Unity 5 I have found an issue that I dont know how to resolve.
Its about Realtime Shadows and how they affect the surface. Screenshot comparison:

Realtime Shadows and Realtime GI (marked as static):

Without Realtime Shadows but with Realtime GI (marked as static):


Surface Shader code:

Code (CSharp):

1. Shader "Custom/Vcol" {
2.     Properties {
3.         [LM_Metallic] [LM_Glossiness] _Meta ("Metalness and Gloss", Color) = (128,128,128,0)
4.     }
5.    
6.     CGINCLUDE
7.         #define _GLOSSYENV 1
8.         #define UNITY_SETUP_BRDF_INPUT MetallicSetup
9.     ENDCG
10.    
11.     SubShader {
12.         Tags { "RenderType"="Opaque" }
13.         LOD 200
14.        
15.         CGPROGRAM
16.         #include "UnityPBSLighting.cginc"
17.         #pragma surface surf Standard addshadow
18.         #pragma target 3.0
19.  
20.         fixed4 _Meta;
21.  
22.         struct Input {
23.             fixed4 color : COLOR;
24.         };
25.  
26.         void surf (Input IN, inout SurfaceOutputStandard o) {
27.             o.Albedo = IN.color.rgb*IN.color.rgb;
28.             o.Metallic = _Meta.rgb;
29.             o.Smoothness = _Meta.a;
30.         }
31.         ENDCG
32.     }
33.     FallBack "Diffuse"
34. }

What I have to include to get the same results as Standard shader? What im doing worng?

 

Hi there unity team,

This is from a converstaion with larsbertram1, creator of LUX, that have the same issue with surface shaders.

 

hi there,

just to add some more info about this:
missing "ao" in custom surface shaders using the standard lighting is caused by the fact that the shader compiler always adds "nodirlightmap" to all passes although this is not defined in the surface shader.
so when using directional lightmaps (even if those are just used for the gi) those will look different using the standard shader compared with a custom surface shader using the standard lighting functions.

having a closer look using the frame debugger gives you the following results (forward rendering):

Shader: Standard (Specular setup) pass #0 DIRECTIONAL SHADOWS_SCREEN LIGHTMAP_OFF DIRLIGHMAP_COMBINED DYNAMICLIGHTMAP_ON _NORMALMAP

Shader: Custom (Specular setup) pass #0 DIRECTIONAL SHADOWS_SCREEN LIGHTMAP_OFF DIRLIGHMAP_OFF DYNAMICLIGHTMAP_ON

lars