### Author Topic: newbie question, how to rotate around a designated axis in jPct ?  (Read 2282 times)

#### guillaume

• int
• Posts: 67
##### newbie question, how to rotate around a designated axis in jPct ?
« on: December 12, 2011, 01:27:59 am »
said I want to rotate a rectangle around a axis which is parallel to XAxis, how can I do this in jPCT,
can someone show me some code ? I am new to opengl and jPCT programming. thanks.

#### EgonOlsen

• Posts: 12065
##### Re: newbie question, how to rotate around a designated axis in jPct ?
« Reply #1 on: December 12, 2011, 07:43:22 am »

#### guillaume

• int
• Posts: 67
##### Re: newbie question, how to rotate around a designated axis in jPct ?
« Reply #2 on: December 12, 2011, 11:15:25 am »
http://www.jpct.net/jpct-ae/doc/com/threed/jpct/Object3D.html#rotateAxis(com.threed.jpct.SimpleVector, float)
if I use this api,  how should I represent a axis  (for example  x=4)  in vector form ? thanks.

#### EgonOlsen

• Posts: 12065
##### Re: newbie question, how to rotate around a designated axis in jPct ?
« Reply #3 on: December 12, 2011, 12:34:21 pm »
x=4 is no axis. I'm not sure what you are after...maybe setRotationPivot() is more what you want?

#### guillaume

• int
• Posts: 67
##### Re: newbie question, how to rotate around a designated axis in jPct ?
« Reply #4 on: December 12, 2011, 12:37:45 pm »
x=4 is no axis. I'm not sure what you are after...maybe setRotationPivot() is more what you want?
oh, I mean a line parallel to Y axis and pass through  point (4,0,0). how can I rotate around this ?