*** Instructions ***

- The effect is more noticeable when the camera moves (due to the nature of parallax mapping)

Keys:

Esc                       : Quit
Cursor Up/Down/Left/Right : Move the camera up/down/left/right
Numeric Keypad +/-        : Zoom in/out
I/O                       : Increase/decrease bias
K/L                       : Increase/decrease scale
W/S                       : Move the light source up/down
D/A                       : Move the light source left/right
Q/E                       : Move the light source inwards/outwards (depth)

The camera rotates with the mouse with the left mouse button held.

- Scale and bias are factors that determine the intensity of the parallax effect. 
  Increasing the bias value will result to a more intense displacement effect.