# 3d - z rotation question!
**URL:** https://forum.kirupa.com/t/3d-z-rotation-question/183157
**Category:** flash
**Created:** [March 24, 2006, 7:56am UTC](https://forum.kirupa.com/t/3d-z-rotation-question/183157 "2006-03-24T07:56:02Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@aBnest](https://forum.kirupa.com/u/aBnest)
#### Post date: [March 24, 2006, 7:56am UTC](https://forum.kirupa.com/t/3d-z-rotation-question/183157/1 "2006-03-24T07:56:02Z")
i’ve been working with Senocular’s tutorial for 3D scripting :
[http://www.kirupa.com/developer/actionscript/faces\_depths.htm](http://www.kirupa.com/developer/actionscript/faces_depths.htm)
//great work, by the way
I made a drag function for it :)… My question is how to change the code
to actualy rotate on the z axis of the cube …
In his tutorial the cube rotates around the z axis of the stage no matter how other axis are rotated.
I think the part of the code that needs to be changed in order to simulate a more realistic rotation on z axis is :
// perform the rotations around each axis
// rotation around x
xy = cx_y - sx_z;
xz = sx_y + cx_z;
// rotation around y
yz = cy_xz - sy_x;
yx = sy_xz + cy_x;
// rotation around z
zx = cz_yx - sz_xy;
zy = sz_yx + cz_xy;
but i never been very good with trigonometry ! and I AM a newbe!:crazy:
Can anyone help me with this please!:esmirk: [SIZE=2][/SIZE][SIZE=2]**[SIZE=3][/SIZE]**[/SIZE]
---
### Author:  [@TheCanadian](https://forum.kirupa.com/u/TheCanadian)
#### Post date: [March 24, 2006, 8:33am UTC](https://forum.kirupa.com/t/3d-z-rotation-question/183157/2 "2006-03-24T08:33:43Z")
rotation around z-axis:
That’s assuming that the z-axis isn’t rotated, the ideas discussed here take into acount the rotation of the axis
[http://www.kirupa.com/developer/actionscript/trig\_multiple\_axis.htm](http://www.kirupa.com/developer/actionscript/trig_multiple_axis.htm)
The code you posted also takes into account the rotation of the z-axis, excpet in those movies the z-axis is never rotated - add this code to the onEnterFrame function to rotate the z-axis with the up/down arrow keys:
```auto
cubeAxisRotations.z += (Key.isDown(Key.UP) - Key.isDown(Key.DOWN)) * 0.1;
```
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### Author:  [@aBnest](https://forum.kirupa.com/u/aBnest)
#### Post date: [March 24, 2006, 9:02am UTC](https://forum.kirupa.com/t/3d-z-rotation-question/183157/3 "2006-03-24T09:02:59Z")
thanks but that does not help me! … already dit it … what i need is to rotate the z axis with the cube … in the tutorial the z axis is alwasy normal to the stage … my question is how to rotate the z axis ?
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### Author:  [@aBnest](https://forum.kirupa.com/u/aBnest)
#### Post date: [March 24, 2006, 9:03am UTC](https://forum.kirupa.com/t/3d-z-rotation-question/183157/4 "2006-03-24T09:03:29Z")
thanks but that does not help me! … already dit it … what i need is to rotate the z axis with the cube … in the tutorial the z axis is alwasy normal to the stage … my question is how to rotate the z axis
(my fault …wasn’t very clear in the first place!)
by the way : this is a nice place to lose some time [http://ghost.aesthetic.ru/index.htm](http://ghost.aesthetic.ru/index.htm)
so can you help me with this…?:pleased:
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### Author:  [@aBnest](https://forum.kirupa.com/u/aBnest)
#### Post date: [March 24, 2006, 3:22pm UTC](https://forum.kirupa.com/t/3d-z-rotation-question/183157/5 "2006-03-24T15:22:01Z")
can someone PLEASE help… i tried the kirupa tutorial but i just don’t have enough trigonometry knowledge to this:
the code is something like this: (part of it…
x = points\*.x;
y = points\*.y;
z = points\*.z;
```
// perform the rotations around each axis
// rotation around x
xy = cx*y - sx*z;
xz = sx*y + cx*z;
// rotation around y
yz = cy*xz - sy*x;
yx = sy*xz + cy*x;
// rotation around z
zx = cz*yx - sz*xy;
zy = sz*yx + cz*xy;
// now determine perspective scaling factor
// yz was the last calculated z value so its the
// final value for z depth
scaleRatio = focalLength/(focalLength + yz);
// assign the new x, y and z
x = zx*scaleRatio;
y = zy*scaleRatio;
// create transformed 2D point with the calculated values
// adding it to the array holding all 2D points
TransformedPointsArray* = make3DPoint(x, y, z);
}
```
but the z axis is ALWAYS perpendicular to the stage… i would realy apreciate if someone could help me ajust the code so that the z axis spins with the cube, because in some point i need to roate around the z axis
PLEASE… PLEASE HELP
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### Author:  [@SiK](https://forum.kirupa.com/u/SiK)
#### Post date: [April 6, 2006, 1:18pm UTC](https://forum.kirupa.com/t/3d-z-rotation-question/183157/6 "2006-04-06T13:18:45Z")
I’m bumping into the same problem. What have you tried already?
I spend at least one day on this problem. No luck so far.
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### Author:  [@gvozden](https://forum.kirupa.com/u/gvozden)
#### Post date: [April 6, 2006, 1:36pm UTC](https://forum.kirupa.com/t/3d-z-rotation-question/183157/7 "2006-04-06T13:36:49Z")
as far as I can see you don’t want then to rotate cube (you want to rotate AXIS) so basicly you want to rotate camera, not objects
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### Author:  [@SiK](https://forum.kirupa.com/u/SiK)
#### Post date: [April 6, 2006, 1:49pm UTC](https://forum.kirupa.com/t/3d-z-rotation-question/183157/8 "2006-04-06T13:49:05Z")
Ok, but that means you have to move the camera too if you want to keep the camera focussed on the object.