Shader Performance Tips.cs

// All functions: http://developer.download.nvidia.com/CgTutorial/cg_tutorial_appendix_e.html

// Performance 
	// Accessing with "_Name" is slower
	Shader.SetGlobalFloat("_Name", value); // => 
	int id = Shader.PropertyToID("_Name"); // Once at Start/ OnEnable
	Shader.SetGlobalFloat(id, value); 
	
// Trouble-shooting:
	// Black Pixels on some devices		= Division by zero
	// Pixelation after running for while 	= using _Time to modify sampling uv (loss of percision), consider _SinTime, _CosTime
	// Unity crashing and stuff ... also division by zero. A very common scenario: before you initialized values they are zero,
	// so if script sets any value intended to be divided by, on the first render frame it may be 0.
// Dictionary:
y=cos(x) // Returns in range [-1, 1] f(0) = 1
y=sin(x) // Returns in range [-1, 1] f(0) = 0
lerp(a,b,t) // (b*t + a*(1-t))
fmod( x , y ) 	= x % y
frac( x ) 	= x % 1
_SinTime, _CosTime
	_SinTime.x == Sin(t/8)
 	_SinTime.y == Sin(t/4)
 	_SinTime.z == Sin(t/2)
 	_SinTime.w == Sin(t)