One: Mathematics in three coordinates
--1D:
1D line only say, corresponding to the number of axes in the mathematics. Used to count or measure.
--2D
corresponding to mathematical coordinates radiation (phase intersects the two axes origin constitute a radiation plane coordinate system ), if the number of units of measure two axes are equal , this radiation is said Cartesian coordinate system system, a Cartesian coordinate system and the Cartesian coordinate system comprises oblique coordinate system.
In 2D Cartesian coordinate system, with (x, y) to represent a point, also known coordinates, the coordinates of each component indicate the direction and distance (value of x is between the origin point to the y-axis distance, the value of y is the distance from the x-axis)
--3D
the corresponding mathematical space coordinate system. In the 3D coordinate system, with (x, y, z) to indicate a point, also known coordinates, the coordinates of each component indicate the point yz, xz, distance and direction between the xy plane.
II: left-handed and right-handed
Coordinate system is divided into left-handed and right-handed coordinate system. Mathematics 3D Cartesian coordinate system using the coordinate system is right-handed, Unity and left-handed uses
the difference between them lies in the different points in the Z-axis.
Finger notation: thumb pointing in the positive direction of the x-axis, the index finger points in the positive y-axis direction, the other three fingers pointing in the positive z-axis
Right-handed use OpenGL, Direct3D left-handed use
