Ambient light: float4 UNITY_LIGHTMODEL_AMBIENT
The coordinates of the vertex of the model: float4 UnityObjectToClipPos (float4)
Model normal to world normal: float3 UnityObjectToWorldNormal (float3)
Model vertex to world vertex transformation matrix: float4 unity_ObjectToWorld
The world vertex sight float3 UnityWorldSpaceViewDir (float3)
Take texture color: float4 tex2D (sampler2D, float2)
Vector dot product: float dot (float3, float3)
Sine cosine sin (θ), cos (θ): θ is in radians
Angle to radian: float radians (float)
Power function: float pow (a, b) a to the power of b
Noise: float noise (float (0 ~ 1))
Vector mode: float length (float3)
Unit Vector: float3 normalize (float3)
Interpolation: lerp (min_v, max_v, w)
************************************************** *** The following is compiled by others
https://www.cnblogs.com/koshio0219/p/11089829.html
https://blog.csdn.net/qq_34562355/article/details/90578815
