本文介绍了Unity中Shader的时间变量使用方法，包括_Time、_SinTime、_CosTime及unity_DeltaTime等，这些变量用于实现随时间变化的效果，如动画等。
_Time float4
Time (t/20, t, t*2, t*3), use to animate things inside the shaders.
_SinTime float4 Sine of time: (t/8, t/4, t/2, t).
_CosTime float4 Cosine of time: (t/8, t/4, t/2, t).
unity_DeltaTime float4 Delta time: (dt, 1/dt, smoothDt, 1/smoothDt).
_Time.x = time / 20
_Time.y = time
_Time.z = time * 2
_Time.w = time * 3
_SinTime float4 Sine of time: (t/8, t/4, t/2, t).
_CosTime float4 Cosine of time: (t/8, t/4, t/2, t).
unity_DeltaTime float4 Delta time: (dt, 1/dt, smoothDt, 1/smoothDt).
_Time.x = time / 20
_Time.y = time
_Time.z = time * 2
_Time.w = time * 3
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