Planar Shadow

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Kanglai Qian 12月 23, 2016
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工作压力大,太久没写shader了要换换脑子解压…今天晚上整了下Planar Shadow玩

planar_shadow

如果要做半透明的话手机上stencil闹心啊(咸鱼失去梦想脸

Shader "Unlit/PlanarShadow"
{
Properties
{
Center("Center", Vector) = (0,0,0,0)
Normal("Normal", Vector) = (0,1,0,0)
}
SubShader
{
Tags { "RenderType"="Opaque" "LightMode"="ForwardBase"}
LOD 100
Pass
{
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
struct appdata
{
float4 vertex : POSITION;
};
struct v2f
{
float4 vertex : SV_POSITION;
};
float4 Center, Normal;
v2f vert (appdata v)
{
v2f o;
float4 wPos = mul(unity_ObjectToWorld, v.vertex);
// directional light
float3 direction = normalize(_WorldSpaceLightPos0.xyz);
// https://en.wikipedia.org/wiki/Line%E2%80%93plane_intersection
float dist = dot(Center.xyz - wPos.xyz, Normal.xyz) / dot(direction, Normal.xyz);
wPos.xyz = wPos.xyz + dist * direction;
o.vertex = mul(unity_MatrixVP, wPos);
return o;
}
fixed4 frag (v2f i) : SV_Target
{
return fixed4(0,0,0,1);
}
ENDCG
}
}
}