Euler angles

[gleb]

Hi!

I am trying to understand the coordinate system used by PTGui, and especially if I can 

express yaw - pitch - roll angles in Euler terms. The goal is to be able to rotate images in PTS file

and visualize them using Three.js (http://threejs.org/) library.

So far, seems the yaw is simply rotation around X axis, but the rest of angles seems not to correspond

to simple Euler angles (http://threejs.org/docs/#Reference/Math/Euler).

Is there an expression or principle how to convert between yaw - pitch - roll angles and 3x3 rotation matrix?

Also, is there a way to go back from 3x3 rotation matrix to yaw - pitch - roll angles?

Thank you,

Gleb

[Erik Krause]

Am 24.07.2016 um 00:18 schrieb gleb:
> So far, seems the yaw is simply rotation around X axis, but the rest of
> angles seems not to correspond
> to simple Euler angles (http://threejs.org/docs/#Reference/Math/Euler).
> Is there an expression or principle how to convert between yaw - pitch -
> roll angles and 3x3 rotation matrix?
> Also, is there a way to go back from 3x3 rotation matrix to yaw - pitch -
> roll angles?

If I remember correctly Yaw, Roll, Pitch are Tait–Bryan angles, like
used in aircraft navigation. Somewhere very deep in my old computer
there should be an excel sheet, which does the calculation. PM me if you
want it.

--
Erik Krause
http://www.erik-krause.de

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[Erik Krause]

Am 24.07.2016 um 12:59 schrieb Erik Krause:
> If I remember correctly Yaw, Roll, Pitch are Tait–Bryan angles

To convert to and from Euler angles see this Stackexchange answer:
http://tinyurl.com/lknjzta
but since Tait-Bryan angles are a special case of Euler angles it might
be sufficient to change the order parameter in your THREE call. However,
this is far beyond my knowledge, sorry. Eventually Joost can say something.

[gleb]

Thank you, yesterday got everything working correctly,

was just the different matrix to Euler angles ordering.

do you mind if I create a package on npm https://www.npmjs.com/ with this JavaScript code? 

This would allow many people simple rotation actions matching the PTGui math

Gleb

[PTGui Support]

Hi Gleb,

Sure, feel free to publish your code.

Kind regards,

New House Internet Services BV
Joost Nieuwenhuijse

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