[yt-users] Rotations in off_axis_projection

Matthew Turk matthewturk at gmail.com
Fri Jan 10 06:25:43 PST 2014


Hi James,

On Thursday, January 9, 2014, James Guillochon wrote:

> Hi everyone,
>
> I have a 3D simulation FLASH that I wish to rotate and then project using
> YT. I know the transformation matrix needed to rotate the domain such that
> the projection is correct, depicted in this image:
> http://i.imgur.com/AOmY6Ao.png. In the image, the dashed lines are the
> original coordinate system, where the original "north_vector" is the red
> dashed line, and the original "normal_vector" is a green dashed line that
> points out of the plane (not visible). The rotated coordinates are shown by
> the solid lines. The transformation matrix A is:
>
> A =
> 0.0478113 -0.345249 0.937292
> 0.912293 -0.367011 -0.181724
> -0.406737 -0.863774 -0.297421
>
> My question is what should I set "normal_vector" and "north_vector" to to
> get the proper projection. I tried just doing A.normal and A.north, but the
> projection I get is not correct. I've also tried multiplying by A_inverse,
> or just multiplying normal and/or north by A (or A_inverse), and setting
> the other vector to a trivial direction (such as [0,0,1]), but none of
> these projections seem to be correct.
>
> Another thing I have tried is opening the data in Visit and rotating the
> domain manually, taking note of what Visit calls the "view normal" and the
> "up vector". The "up vector" matches the "north vector" I calculate using
> A.north, but the "view normal" does not match A.normal.
>
> Does anyone know the proper way to go about this? Thanks!
>

I saw that you had some discussion about this on IRC yesterday evening --
did the issues get resolved?

-Matt


> - James
>
> --
> James Guillochon
> Einstein Fellow at the Harvard-Smithsonian CfA
> jguillochon at cfa.harvard.edu <javascript:_e({}, 'cvml',
> 'jguillochon at cfa.harvard.edu');>
>
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