Hi!!
I’m beginner in shaders… I’m trying to put a shadow in my shader. He will be on static objects and I cannot use lightmap.
I got to cast shadows adding fallback and I’ve tried everything to make the model also receives shadows. Follow the code below, if anyone can help me would be very grateful. 
Shader "stand colors" {
Properties {
_Emission ("Emissive Color", Color) = (0,0,0,1)
_Correction ("Correction", Color) = (1,1,1,1)
_SpecColor ("Spec Color", Color) = (1,1,1,1)
_MaskColor1 ("MaskColor1", Color ) = (1,1,1,1)
_MaskColor2 ("MaskColor2", Color ) = (1,1,1,1)
_MainTex ("Texture", 2D) = ""
_Mask1 ("Mask1", 2D) = ""
_Mask2 ("Mask2", 2D) = ""
}
SubShader {
Blend SrcAlpha OneMinusSrcAlpha
Pass {
Material {
Diffuse [_Correction]
Specular [_SpecColor]
Emission [_Emission]
}
Lighting On
SeparateSpecular On
SetTexture[_MainTex]{
constantColor [_Correction]
Combine texture * constant
}
}
Pass{
AlphaTest Greater 0.5
Blend DstColor SrcColor
SetTexture[_Mask1] {
constantColor [_MaskColor1]
Combine texture * constant
}
}
Pass{
AlphaTest Greater 0.5
Blend DstColor SrcColor
SetTexture[_Mask2] {
constantColor [_MaskColor2]
Combine texture * constant
}
}
}
Fallback "Diffuse"
}