Sprite Bumped Diffuse wrong Light direction

Hi,

Im really new to writing shaders and i have a strange problem with my Bumped Diffuse Shader for Sprites. Sometimes the Shaders seems to be "stuck" and doesnt get the right direction of the Directional Light in my Scene. Strangely this only happens to some object and some are normal but all are using the same Material/Shader.

In the following screenshots the Directional Light is coming from the Left:


When Rotating the Object the wrong light direction of the False objects seems to be rotating with it:


The other Thing is that when there is a pointlight goint over These wrong object they are shortly showing the right directional light direction, but switching back to the wrong as soon as the pointlight is gone:



the other Thing, but maybe unrelated is that when i put an normal map to the shader it has the y axes reversed. im Fixing this by Setting the y-tiling to -1 and the ofset so 1.
The Normal maps are created from Unity by Greyscale hightmaps.

heres the shader:

Code (JavaScript):

1. Shader "Sprites/Bumped Diffuse"
2. {
3.     Properties
4.     {
5.         [PerRendererData] _MainTex ("Sprite Texture", 2D) = "white" {}
6.         _BumpMap ("Normalmap", 2D) = "bump" {}
7.         _Color ("Tint", Color) = (1,1,1,1)
8.         [MaterialToggle] PixelSnap ("Pixel snap", Float) = 0
9.                 _Cutoff ("Alpha Cutoff", Range (0,1)) = 0.5
10.  
11.     }
12.  
13.     SubShader
14.     {
15.         Tags
16.         {
17.             "Queue"="Transparent"
18.             "IgnoreProjector"="True"
19.             "RenderType"="TransparentCutOut"
20.             "PreviewType"="Plane"
21.             "CanUseSpriteAtlas"="True"
22.          
23.         }
24.             LOD 300
25.  
26.  
27.         Cull Off
28.         Lighting On
29.         ZWrite Off
30.         Fog { Mode Off }
31.      
32.  
33.         CGPROGRAM
34.         #pragma surface surf Lambert alpha vertex:vert alphatest:_Cutoff
35.         #pragma multi_compile DUMMY PIXELSNAP_ON
36.  
37.         sampler2D _MainTex;
38.         sampler2D _BumpMap;
39.         fixed4 _Color;
40.  
41.         struct Input
42.         {
43.             float2 uv_MainTex;
44.             float2 uv_BumpMap;
45.             fixed4 color;
46.         };
47.      
48.         void vert (inout appdata_full v, out Input o)
49.         {
50.             #if defined(PIXELSNAP_ON) && !defined(SHADER_API_FLASH)
51.             v.vertex = UnityPixelSnap (v.vertex);
52.             #endif
53.             v.normal = float3(0,0,-1);
54.             v.tangent =  float4(1, 0, 0, 1);
55.          
56.             UNITY_INITIALIZE_OUTPUT(Input, o);
57.             o.color = _Color;
58.         }
59.  
60.         void surf (Input IN, inout SurfaceOutput o)
61.         {
62.             fixed4 c = tex2D(_MainTex, IN.uv_MainTex) * IN.color;
63.             o.Albedo = c.rgb;
64.             o.Alpha = c.a;
65.             o.Normal = UnpackNormal(tex2D(_BumpMap, IN.uv_BumpMap));
66.         }
67.         ENDCG
68.     }
69.  
70. //Fallback "Transparent/Cutout/Diffuse"
71. }
72.  

has anyone encountert that Problem and/or has a sollution?

 

I think that your problem in vert. Try not set the v.tangent and v.normal.

 

if if do that the sprite doens't get any lighting at all :/

 

Ok. I'll try. And without
v.tangent= float4(1,0,0,1);
all works fine.

 

Without v.tangent = float4(1,0,0,1); my Szene Looks like this:


Same Lighting, same Normalmap as before.

 

Send me an example scene. Maybe I can understand what happened with lighting.
My e-mail andreich.ne@gmail.com

 

Okay while creating the test Szene i noticed something. This error only occures if i instantiate the same prefab twice. If i instantiate the grey, then the green and then the grey again there is no false lighting. So it must have something to do with my instantiation Prozess and the shader is okay right? Looking into that right now..

 

Sounds like it's batching together. That would screw up the tangent vector (which is only correct for UVs running exactly vertical/horizontal and a normal pointing straight outwards).

 

Okay now its getting crazy. I made this test Scene now and when i pull 2 of the same prefab into the Szene the light seems to rotate. if i delete one of the objects it turns to normal. anyone who would like to test it just pull a "Bridge" gameobject from the prefab into the Scene or delete a "Turret" gameobject.

 

Ok. I have result:

 

Hm,

same scene, i get this one:


am i missing some options? somethings odly wrong..

 

Hm... it's intresting... very strange, but intresting!
What kind of unity? Pro, indie? Maybe different versions?

 

I habe the indie 4.3.4f1

 

Indie 4.5.0f, try update your unity...

 

Works fine with 4.5.0f6 now.

Thank you for your help.

 

You're welcome! =)

 

"- SpriteRenderer will now output normals and tangents if the active material require them."

there it is in the 4.5 release notes ^^