Convert 3D trajectories (x,y,z) to 2D(x,y) along its direction

[prosto_w_bemben]

ok thanks.

But I'm sure that I made two differents threads about two differents things

[RavensFan]

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@prosto_w_bemben wrote:

ok thanks.

But I'm sure that I made two differents threads about two differents things

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Other thread: Angle measurements from XYZ positions

This thread:   Convert 3D trajectories (x,y,z) to 2D(x,y) along its direction

And when you get into the messages of each thread, you see you certainly made two different threads about the same thing.

[prosto_w_bemben]

If somebody is only watching at first pictures witouth text. In first thread I aksed about script that will help us with angle measurment, the second thread is about converting from 3d to 2d.

[RavensFan]

In first message of other thread:

"I also have a numerical table with whole XYZ positions for every particle in next frames. Now my question: is there any way in LabView to measure initial (strating) angle for every track from first 10 frames (1-10)? On picture above this could be an angle for part of tracks marked in red colour. We only have to know initial angle, other part of tracks does not matter actually."

First message of this thread:

" Now, I would like to convert each trajectory to 2D (X,Y) along its direction and have got it as I called "flat". Each trajectory is in another direction so is there a chance do convert it like this: first trajectory converted along itself, second trajectory converted along itself e.t.c. Is there a chance to make it in LabView? Please, help me"

Sounds pretty much like the same question to me!

[Bob_Schor]

This is entirely a 3-D Geometry/Math/Coordinates question/problem, which I tried to address (and thought I had) in your earlier post.  Rather than argue with us, find a bright high school student who has taken some elements of Calculus and Analytic Geometry (or maybe a college student who has taken "Engineering Mathematics") and get them to teach you how to handle questions of this type.  You can also search the web ...

Bob Schor

[prosto_w_bemben]

I'm sorry that You don't understand me. The problem is lying on english interpretation when I don't know sometimes how to explain some things. Maybe You're right that both threads were the same, but I wanted to know 1) how to measure an angle between two vecotrs (and get it), 2) how to get my point in deifferents projections. I also got answer for second question (Cylindrical coordinates and Spherical Polar Coordinates) but now I'm thinking how to use it properly. I don't want to argue with somebody. Apologize.