# Little 3D question (i'm a 3d n00b)

**URL:** <https://forum.kirupa.com/t/little-3d-question-im-a-3d-n00b/169223>\
**Category:** Uncategorized\
**Created:** [November 14, 2005, 3:58pm UTC](https://forum.kirupa.com/t/little-3d-question-im-a-3d-n00b/169223 "2005-11-14T15:58:12Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![9604\_9604\_9604](https://avatars.discourse-cdn.com/v4/letter/9/9f8e36/32.png) [@9604\_9604\_9604](https://forum.kirupa.com/u/9604_9604_9604)\
**Post date:** [November 14, 2005, 3:58pm UTC](https://forum.kirupa.com/t/little-3d-question-im-a-3d-n00b/169223/1 "2005-11-14T15:58:12Z")

</div>

i’m reading this: [http://www.kirupa.com/developer/actionscript/trig\_multiple\_axis.htm](http://www.kirupa.com/developer/actionscript/trig_multiple_axis.htm)

and i don’t realy get to anderstand this:

[font=Courier New]x = [color=#000080]Math[/color].[color=#000080]cos/color\*x - [color=#000080]Math[/color].[color=#000080]sin/color\*y;  
y = [color=#000080]Math[/color].[color=#000080]sin/color\*x + [color=#000080]Math[/color].[color=#000080]cos/color\*y;[/font]  
[font=Courier New][/font]  
[font=Courier New]i mean, WHY is a minus (-) in the x equation and a plus (+) in the other?? whyyyyyyyyy???[/font]  
[font=Courier New][/font]  
[font=Courier New]i’m trying to figth with my brain to get this, but i need some help.[/font]  
[font=Courier New][/font]  
[font=Courier New]Thanks.[/font]