[yt-users] camera rotation

[Matthew Turk]

Thanks Sam and Mateusz.  I've merged the PR!

On Thu, Dec 5, 2013 at 5:27 PM, Sam Skillman <samskillman at gmail.com> wrote:
> Hi Mateusz,
>
> Sorry for the hassle -- it seems a bug was introduced a while back and
> you're the first one to attempt to rotate around something not at the center
> of the simulation since then! I've issued a pull request that should fix
> this so that the focus stays locked on C and it should rotate about it.
> Your script above should not have to be altered, though I'll note that the N
> argument in the cam.rotation() call isn't necessary since it will by default
> rotate around the "north_vector", which is N in your case.
>
> I expect that this PR will be accepted quite quickly:
> https://bitbucket.org/yt_analysis/yt/pull-request/672/bugfix-for-camera-movement/diff
>
> Best,
> Sam
>
>
> On Thu, Dec 5, 2013 at 1:08 PM, Mateusz Ruszkowski <mateuszr at umich.edu>
> wrote:
>>
>>
>>
>>    Hi all,
>>
>> I am trying to understand how the camera rotation works in yt. I verified
>> that the following set of commands
>>
>> C = (0.0,-50*kpc,zPos)
>> L = (0.0,-1.0,0.0)
>> W = 100*kpc
>> N = (0.0,0.0,1.0)
>> cam = pf.h.camera(C, L, W, 512, tf, N)
>> cam.snapshot("single_snapshot.png")
>>
>> produces a nice image of a flat gas distribution located in the (x,y)
>> plane anchored at zPos. I would like to move the camera around the z-axis
>> while pointing it at (0,0,zPos) and take 10 snapshots. This should result in
>> a sequence of 10 identical images of the same pancake-flat distribution of
>> the gas. I tried this:
>>
>> for i, snap in enumerate(cam.rotation(2*np.pi, 10,N)):
>>     print "Taking snapshot % 3i" % (i+1)
>>     snap.write_png("rot_%04i.png" % i)
>>
>> My assumption was that "N" in the above command defines the vector around
>> which to move the camera. This procedure did generate 10 images but they
>> were all different rather than identical. My question is how do I move the
>> camera around the z-axis while pointing it at (0,0,zPos), or in other words,
>> how do I define the point where "N" is anchored.
>>
>>    Thanks,
>>      Mateusz
>>
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>
>
>
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