Hello 3D world !
This is a basic 3D rotation and pixel index exercise in HTML5 canvas/jQuery.
(1) Use slider (range: 0 - 40 with Chrome) to position pixels spacing.
(2) Click on an arrow to rotate 5 degrees increment.

Reference: 3D Computer Graphics - 3rd Edition by Alan Watt, pg. 5

Rotate X:

Rotate Y: