[Sylf]

1. X and Y axis are, as you guessed, runs horizontally and vertically. When you add the Z axis, that adds the 3rd dimension to the graph - it's the depth.

[Script Info]
ScriptType: v4.00+
PlayResX: 800
PlayResY: 600

[V4+ Styles]
Format:  Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
Style: Default,Arial,36,&H00FFFFFF,&H0000FFFF,&H00000000,&H00000000,0,0,0,0,100,100,0,0.00,1,2.00,0.00,5,20,20,20,0

[Events]
Format:  Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:00.00,0:00:03.00,Default,,0000,0000,0000,,{\org(400,300)}{\pos(400,300)\frx0\t(0,3000,\frx720)}Rotating Along X-Axis
Dialogue: 0,0:00:03.00,0:00:06.00,Default,,0000,0000,0000,,{\org(400,300)}{\pos(400,40)\frx0\t(0,3000,\frx720)}Rotating Along X-Axis
Dialogue: 0,0:00:06.00,0:00:09.00,Default,,0000,0000,0000,,{\org(400,300)}{\pos(400,300)\fry0\t(0,3000,\fry720)}Rotating Along Y-Axis
Dialogue: 0,0:00:09.00,0:00:12.00,Default,,0000,0000,0000,,{\org(400,300)}{\pos(80,300)\fry0\t(0,3000,\fry720)}Rotating Along Y-Axis
Dialogue: 0,0:00:12.00,0:00:15.00,Default,,0000,0000,0000,,{\org(400,300)}{\pos(400,300)\frz0\t(0,3000,\frz720)}Rotating Along Z-Axis
Dialogue: 0,0:00:15.00,0:00:18.00,Default,,0000,0000,0000,,{\org(400,300)}{\pos(400,40)\frz0\t(0,3000,\frz720)}Rotating Along Z-Axis

Load that script in some 4:3 clip, and watch what happens. It really should explain what's going on.


2. As you saw in the second example of Y-axis rotation above, when you rotate text in such manner with a very large \org displacement like 10000, (against the virtual screen size of 800 width), a small Y-axis rotation causes the text to move in horizontal direction without warping the text too much like you saw in the example.


It's the same principle as how people used to think that the earth was flat.