Shader "Custom/SolidColor" {
SubShader {
Pass {
// 1.) This will be the base forward rendering pass in which ambient, vertex, and
// main directional light will be applied. Additional lights will need additional passes
// using the "ForwardAdd" lightmode.
// see: http://docs.unity3d.com/Manual/SL-PassTags.html
Tags { "LightMode" = "ForwardBase" }
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
// 2.) This matches the "forward base" of the LightMode tag to ensure the shader compiles
// properly for the forward bass pass. As with the LightMode tag, for any additional lights
// this would be changed from _fwdbase to _fwdadd.
#pragma multi_compile_fwdbase
// 3.) Reference the Unity library that includes all the lighting shadow macros
#include "AutoLight.cginc"
struct v2f
{
float4 pos : SV_POSITION;
// 4.) The LIGHTING_COORDS macro (defined in AutoLight.cginc) defines the parameters needed to sample
// the shadow map. The (0,1) specifies which unused TEXCOORD semantics to hold the sampled values -
// As I'm not using any texcoords in this shader, I can use TEXCOORD0 and TEXCOORD1 for the shadow
// sampling. If I was already using TEXCOORD for UV coordinates, say, I could specify
// LIGHTING_COORDS(1,2) instead to use TEXCOORD1 and TEXCOORD2.
LIGHTING_COORDS(0,1)
};
v2f vert(appdata_base v) {
v2f o;
o.pos = mul (UNITY_MATRIX_MVP, v.vertex);
// 5.) The TRANSFER_VERTEX_TO_FRAGMENT macro populates the chosen LIGHTING_COORDS in the v2f structure
// with appropriate values to sample from the shadow/lighting map
TRANSFER_VERTEX_TO_FRAGMENT(o);
return o;
}
fixed4 frag(v2f i) : COLOR {
// 6.) The LIGHT_ATTENUATION samples the shadowmap (using the coordinates calculated by TRANSFER_VERTEX_TO_FRAGMENT
// and stored in the structure defined by LIGHTING_COORDS), and returns the value as a float.
float attenuation = LIGHT_ATTENUATION(i);
return fixed4(1.0,0.0,0.0,1.0) * attenuation;
}
ENDCG
}
}
// 7.) To receive or cast a shadow, shaders must implement the appropriate "Shadow Collector" or "Shadow Caster" pass.
// Although we haven't explicitly done so in this shader, if these passes are missing they will be read from a fallback
// shader instead, so specify one here to import the collector/caster passes used in that fallback.
// Fallback
}
why appear the shadow out of the shadowmap distance?how to remove~
