unity3D shader学习

网络信息汇总

 

unity内部阴影的使用

阴影的投射只要有shadow caster通道即可；
阴影接受的计算：

方法1

#pragma multi_compile_fwdbase
 #include “AutoLight.cginc”
 SHADOW_COORDS(1) // put shadows data into TEXCOORD1
 TRANSFER_SHADOW(o)
 fixed shadow = SHADOW_ATTENUATION(i);

方法2

 #pragma multi_compile_fwdbase
// after CGPROGRAM;
#include "AutoLight.cginc"
 
// in v2f struct;
LIGHTING_COORDS(0,1) // replace 0 and 1 with the next available TEXCOORDs in your shader, don't put a semicolon at the end of this line.
 
// in vert shader;
TRANSFER_VERTEX_TO_FRAGMENT(o); // Calculates shadow and light attenuation and passes it to the frag shader.
 
//in frag shader;
float atten = LIGHT_ATTENUATION(i); // This is a float for your shadow/attenuation value, multiply your lighting value by this to get shadows. Replace i with whatever you've defined your input struct to be called (e.g. frag(v2f [b]i[/b]) : COLOR { ... ).

方法3

#pragma multi_compile_fwdbase
#include "AutoLight.cginc"
UNITY_LIGHTING_COORDS(6,7)
UNITY_TRANSFER_LIGHTING(o, v.uv1);
UNITY_LIGHT_ATTENUATION(atten, i, s.posWorld);