[yt-dev] camera rotation problem

[Sam Skillman]

Hi all,

Seems like it was an errant change when we moved to the orientation vector.
 This is now fixed in tip.

Sam

On Thu, Sep 13, 2012 at 2:48 PM, Geoffrey So <gsiisg at gmail.com> wrote:

> In my email that's exactly what I tried, getting rid of the rot_vector on
> line 17
>
> "I've modified Sam's script to image the entire box, because it's harder
> to see the effect if we're looking at a sphere
> http://paste.yt-project.org/show/2689/
> This script will produce the strange rotation, if the rot_vector is taken
> out on line 17, then the rotation about the camera up is recovered.  But
> that's not what was done before by yt and not what I wanted."
>
> and I get the video here:
> curl -O http://lca.ucsd.edu/~gso/test_movies/no_rot_vector.mpg
>
> the movie above is rotation centered at at the middle of the data, but
> around the "up" axis of the camera, not the "z" axis of the data with a
> constant azimuthal angle, which rotation USED to do, shown here:
>
> curl -O http://lca.ucsd.edu/~gso/test_movies/Density.avi
>
> From
> G.S.
>
>
> On Thu, Sep 13, 2012 at 12:40 PM, Sam Skillman <samskillman at gmail.com>wrote:
>
>> Hi Geoffrey,
>>
>> Can you try setting steady_north=True, north_vector=[0,0,1], and not
>> specify a rot_vector in the rotation call?
>>
>> Sam
>>
>> On Thu, Sep 13, 2012 at 12:51 PM, Geoffrey So <gsiisg at gmail.com> wrote:
>>
>>> Short version:
>>>
>>> The following movie shows what's possible with yt-dev ~2.1
>>>  The camera rotates about z axis of the data with a constant azimuthal
>>> angle w.r.t the z of the data:
>>> curl -O http://lca.ucsd.edu/~gso/test_movies/Density.avi
>>>
>>> The following movies shows what happens now if I have a rotation vector
>>> or no rotation vector
>>>
>>> Weird camera rotation:
>>> curl -O http://lca.ucsd.edu/~gso/test_movies/with_rot_vector.mpg
>>> Camera rotates about the "up" axis of the camera:
>>> curl -O http://lca.ucsd.edu/~gso/test_movies/no_rot_vector.mpg
>>>
>>> Long version:
>>>
>>> I brought this issue up a while back but got distracted before it was
>>> resolved, and over past two days did more digging/testing.
>>>
>>> symptom:
>>>
>>> I cannot rotate the camera about the z axis of the data while keeping
>>> the azimuthal angle constant anymore, where as I could do this before in I
>>> believe yt-dev 2.1ish.
>>>
>>> What I tried/found:
>>>
>>> I thought I mailed the dev list but couldn't dig it out of the yt-dev
>>> archive, so maybe I only complained in IRC before.  This thread is the
>>> latter portion where Nathan and Sam were helping me with helpful
>>> suggestions and what to try.
>>>
>>> http://lists.spacepope.org/htdig.cgi/yt-dev-spacepope.org/2012-August/002267.html
>>> The example script Sam provided (by not specifying the north_vector)
>>> will rotate the camera about the camera's z (up) axis, but not the data's z
>>> axis, if looking at the image, what I am trying to do is have the camera
>>> rotate around the disk about the axis normal to the disk's plane (assume
>>> disk is in x-y plane).
>>>
>>> I tried playing with the north_vector, steady_north in the camera
>>> object, and the rot_vector in cam.rotation, made sure the vectors are
>>> normalized.
>>>
>>> I found that if I specify the normal vector (usually designated "L" in
>>> example scripts) as the x or -x axis, and the north vector as the z axis, I
>>> can look at the data cube (in this case Enzo data), and watch it rotate
>>> about the z axis, the behavior I expected.  However, if my L is tilted not
>>> 90 degrees (non x or y axis), no matter what I specify as the north vector,
>>> the rotation angle changes and the cube wobbles or precesses.
>>>
>>> I've modified Sam's script to image the entire box, because it's harder
>>> to see the effect if we're looking at a sphere
>>> http://paste.yt-project.org/show/2689/
>>> This script will produce the strange rotation, if the rot_vector is
>>> taken out on line 17, then the rotation about the camera up is recovered.
>>>  But that's not what was done before and not what I wanted.
>>>
>>> I also wrote the script to reproduce the effect I wanted with the
>>> rotation, but this is a lot more work than before.  I have to specify a new
>>> L and a new up angle for the camera for every frame to get back the effect
>>> I wanted.
>>> http://paste.yt-project.org/show/2690/
>>>
>>> Hope this help track down the problem, cam.rotation is so much simpler
>>> to use :-)
>>>
>>> From
>>> G.S.
>>>
>>> _______________________________________________
>>> yt-dev mailing list
>>> yt-dev at lists.spacepope.org
>>> http://lists.spacepope.org/listinfo.cgi/yt-dev-spacepope.org
>>>
>>>
>>
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