Reality

`Reality()`

Create a reality.

This is the first function to be called, it will initalize the immersive experience.

var myReality = new XR.Reality();

Name	Type	Default	Description
`fps`	`int`		frames per second
`fov`	`int`		field of view
`physics`	`bool`	`true`	physics on or off
`gravity`	`float` or `array`	`-10`	gravity `[x,y,z]` or just `y`
`position`	array		`[x,y,z]` location for camera to start
`near`	`int`	`0.1`	min render distance
`far`	`int`	`1000`	max render distance

turn physics on or off
see physics

if a single number, gravity will exist downward if an array, there can me multi-dimensional gravity [x_force,y_force,z_force]