I’m having a bit of a strange issue with the shader from this thread: http://forum.unity3d.com/threads/218251-Shader-for-Sprites-to-cast-shadows-and-take-normal-maps that allows sprites to cast/accept shadows as well as use normal mapping. The shader works perfectly except for a strange lighting issue - there seems to be a lighting “threshold” that depends on the position (and angle) of lights cast on the sprite, the lighting changes dramatically as the light crosses this threshold. Attached are two screenshots that demonstrate the issue better than I can describe. I really have no idea what I’m doing when it comes to shader, and can’t for the life of me get the shader to light smoothly. Anyone have any idea what’s going on?
Shader "Sprites/Bumped Diffuse with Shadows"
{
Properties
{
[PerRendererData] _MainTex ("Sprite Texture", 2D) = "white" {}
_BumpMap ("Normalmap", 2D) = "bump" {}
_Color ("Tint", Color) = (1,1,1,1)
[MaterialToggle] PixelSnap ("Pixel snap", Float) = 0
_Cutoff ("Alpha Cutoff", Range (0,1)) = 0.5
}
SubShader
{
Tags
{
"Queue"="Transparent"
"IgnoreProjector"="True"
"RenderType"="TransparentCutOut"
"PreviewType"="Plane"
"CanUseSpriteAtlas"="True"
}
LOD 300
Cull Off
Lighting On
ZWrite Off
Fog { Mode Off }
CGPROGRAM
#pragma surface surf Lambert alpha vertex:vert addshadow alphatest:_Cutoff
#pragma multi_compile DUMMY PIXELSNAP_ON
sampler2D _MainTex;
sampler2D _BumpMap;
fixed4 _Color;
struct Input
{
float2 uv_MainTex;
float2 uv_BumpMap;
fixed4 color;
};
void vert (inout appdata_full v, out Input o)
{
#if defined(PIXELSNAP_ON) !defined(SHADER_API_FLASH)
v.vertex = UnityPixelSnap (v.vertex);
#endif
v.normal = float3(0,0,-1);
v.tangent = float4(1, 0, 0, 1);
UNITY_INITIALIZE_OUTPUT(Input, o);
o.color = _Color;
}
void surf (Input IN, inout SurfaceOutput o)
{
fixed4 c = tex2D(_MainTex, IN.uv_MainTex) * IN.color;
o.Albedo = c.rgb;
o.Alpha = c.a;
o.Normal = UnpackNormal(tex2D(_BumpMap, IN.uv_BumpMap));
}
ENDCG
}
Fallback "Transparent/Cutout/Diffuse"
}
