is unable to scale a 3D vector length as you wish

I try to view a vector 3D of a scene. I want the vector position, direction and length to vary with time. The home of the dmonstrates program it.  The position vector and the direction change as you wish, but the length does not change as you wish.  The problem may be clear, if you run the attached VI.  Basically, I create a vector oriented according to the Z axis.  With each time step, I change its length along Z, then translate it in the desired position, then turn it to the desired response.  The problem is that the cycles of component Z between 0 and 1, rather than the length of cycle between 0 and 1.

I searched the forums for discussion of assistance, does not.

I assumed that this situation occurs because the component most recently posted version of the vector z was being phased out, instead of scaling the vector of the component z of the INITIAL report, that points along the z axis.  That's why I tried to create 2 copies of the vector object.  A copy is the "variable" which is processed and displayed.  The other is kept not transformed.  At each stage of the stime, I copy that unprocessed to processed, and then transform.  This did not remedy the problem.  I tried to erase all the transformations at the end of each timestep - and this is the verion I my validation.  However, this does not have the problem.

A solution I've seen for this problem is to create a new vector object during each time step, and then add it to the stage, and then resize it, translate and turn it.  Then, when it is displayed, the object is removed from the scene.  Then a new vector object is created for the next time step.  It seems mathematically inefficient and inelegant, and I'm worried about memory fills, since I would create a new object every 50 milliseconds.

Two subVIs (DrawUnitArrow, DrawUnitAxes) are also attached.

Thank you.

In VI you posted, if you replace the "Set Rotation" with an 'object to turn' vi vi, I believe you get the desired behavior. (You probably also want to turn before translate you)

Tags: NI Software

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