SOLVED Quaternion rotation

Hello friends,
I'm trying to work with the Quaternion-Object.
My cam-Object should align to the direction vector and pointed in this case in X-Direction.
But if print the q.v value I get a zero vector and the rotation is not applied
Does I misunderstood the Quaternion-Syntax? I can't find nothing about that.
–
Thanks

import c4d

cam = op.GetObject()

def main():
    direction = c4d.Vector(10,0,0).GetNormalized()
    angle = 0

    q = c4d.Quaternion()
    q.SetAxis(direction, angle)
    b = q.GetMatrix()
    b.off = cam.GetAbsPos()
    cam.SetMg(b)

    print q.v

Hi,

please, do not delete discussions threads. The contained information might be valuable for future readers.

Cheers,
Andreas

Hi Tudor,

actually your code is properly behaving, since the angle is set to 0. If, by chance, you set it to PI/2 you will immediately see that the camera promptly rotates and point up to the sky.

Hope the screenshot clarifies the situation

Best, Riccardo

I thought I can use this direction vector as Quaternion-Axis. The cam should point than to the target.
But but it seems i need a different approach.

import c4d, math

cam = op.GetObject()
target = op[c4d.ID_USERDATA,1]

def main():
   tarPos = target.GetAbsPos()
   camPos = cam.GetAbsPos()


   direction = (tarPos - camPos).GetNormalized()
   angle = math.pi/2  #?

   q = c4d.Quaternion()
   q.SetAxis(direction, angle)
   b = q.GetMatrix()
   b.off = cam.GetAbsPos()
   cam.SetMg(b)

Hi Tudor, that's indeed not the way to proceed.

Quaternion is just a tool to conveniently represent a rotation in the space. That said the approach you need to follow is just to rotate the camera until it points where your target is.

Cheers, Riccardo

Hi,

please, do not delete discussions threads. The contained information might be valuable for future readers.

Cheers,
Andreas