#define PI 3.1415
#define SPEED_OF_LIGHT 3e8 //not exact but hey!
#define SPEED_OF_LIGHT_SQ 9e+16
#define INFINITY 1e31 //closer then enough

//atmos
#define R_IDEAL_GAS_EQUATION	8.31 //kPa*L/(K*mol)
#define ONE_ATMOSPHERE		101.325	//kPa
#define T0C  273.15					// 0degC
#define T20C 293.15					// 20degC
#define TCMB 2.7					// -270.3degC

#define Clamp(x, y, z) 	(x <= y ? y : (x >= z ? z : x))

#define CLAMP01(x) 		(Clamp(x, 0, 1))