将以下脚本附到产生Shadow的物体上：
voidOnEnable(){
GetComponent().receiveShadows =true;
GetComponent().castShadows =true;
}
但是这是不够的，还需要Shader帮忙,下面的Shader请放到产生Shadow的物体上：
Shader "Custom/SpriteDiffuse"
{
Properties
{
_MainTex ("Texture", 2D) = "white" {}
_AlphaCutOff ("AlphaCutOff", Range(0,1)) = 0.05
}
SubShader
{
Pass
{
Tags {"LightMode"="ForwardBase"}
CGPROGRAM
pragma vertex vert
pragma fragment frag
include "UnityCG.cginc"
include "Lighting.cginc"
include "AutoLight.cginc"
sampler2D _MainTex;
fixed _AlphaCutOff;
struct appdata
{
half3 normal : NORMAL;
float4 vertex : POSITION;
float2 uv : TEXCOORD;
fixed4 color : COLOR;
};
struct v2f
{
float2 uv : TEXCOORD;
fixed4 color : COLOR;
float4 vertex : SV_POSITION;
};
v2f vert (appdata v)
{
v2f o;
o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);
o.uv = v.uv;
o.color = v.color;
return o;
}
fixed4 frag (v2f i) : SV_Target
{
fixed4 col = tex2D(_MainTex, i.uv) * i.color;
clip(col.a - _AlphaCutOff);
return col;
}
ENDCG
}
Pass
{
Tags {"LightMode"="ShadowCaster"}
CGPROGRAM
pragma vertex vert
pragma fragment frag
pragma multi_compile_shadowcaster
include "UnityCG.cginc"
include "Lighting.cginc"
include "AutoLight.cginc"
sampler2D _MainTex;
fixed _AlphaCutOff;
struct v2f {
V2F_SHADOW_CASTER;
float4 texcoord : TEXCOORD1;
fixed4 color : COLOR;
};
v2f vert(appdata_full v)
{
v2f o;
o.texcoord = v.texcoord;
o.color = v.color;
TRANSFER_SHADOW_CASTER_NORMALOFFSET(o)
return o;
}
float4 frag(v2f i) : SV_Target
{
fixed4 col = tex2D(_MainTex, i.texcoord) * i.color;
clip(col.a - _AlphaCutOff);
SHADOW_CASTER_FRAGMENT(i)
}
ENDCG
}
}
}
此外还要有一个Shader，来接受阴影：
Shader "Custom/Diffuse2DTexture" {
Properties {
_MainTex ("Base (RGB)", 2D) = "white" {}
}
SubShader {
Tags { "RenderType"="Opaque" }
LOD 200
CGPROGRAM
pragma surface surf Lambert
sampler2D _MainTex;
struct Input {
float2 uv_MainTex;
};
void surf (Input IN, inout SurfaceOutput o) {
half4 c = tex2D (_MainTex, IN.uv_MainTex);
o.Albedo = c.rgb;
o.Alpha = c.a;
}
ENDCG
}
FallBack "Diffuse"
}
增加光源之后，运行Scene即可见阴影（不运行的话脚本的内容没有运行会导致不开启阴影）。
更多unity2018的功能介绍请到paws3d爪爪学院查找。
