[yt-users] volume rendering rotate

[Britton Smith]

Hi Stella,

I'm looking at script I wrote recently to do something similar to what
you're doing, I see that I also have this keyword in camera instantiation
as well: north_vector=[0., 0., 1.].
You might need to manually set the north vector for the stead_north to work
properly.

Also, it looks like in my script I did not supply a rot_vector, so it just
rotated about north.  If simply adding the north_vector kwarg doesn't work,
you might also try that.

Britton

On Tue, Nov 8, 2011 at 11:16 AM, Stella Offner <soffner at cfa.harvard.edu>wrote:

> Hi Britton,
>
> Thanks. I did try that and it didn't seem to fix the problem:
> cam = pf.h.camera(c, L, W, Nvec, tf, fields=["log_den"], steady_north=True)
> I'm also zoomed pretty far into the volume, so maybe that has something to
> do with it?
>
> Stella
>
>
> Britton Smith wrote:
>
>> Hi Stella,
>>
>> I think all you have to do is add the "steady_north=True" keyword arg to
>> the camera instantiation and you should be all set.
>>
>> Britton
>>
>> On Tue, Nov 8, 2011 at 10:35 AM, Stella Offner <soffner at cfa.harvard.edu<mailto:
>> soffner at cfa.harvard.**edu <soffner at cfa.harvard.edu>>> wrote:
>>
>>    Hi,
>>
>>    I'm making a volume rendering movie and I'm encountering an issue
>>    with the rotate function. I'm iterating over a call to
>>    cam.rotate(angle, rot_vector=north), with a fixed angle and north
>>    vector. However, the  output images rotate about that axis for a
>>    few frames and then switch  north vectors and rotate about a
>>    different north. I'm using a yt version I installed a couple weeks
>>    ago, so its pretty up to date. Do you know what could be going on?
>>
>>    for j in range(1,76):
>> cam.rotate((3.14*2.0/75.0), rot_vector=[0, 0, 1])
>>             vals = cam.snapshot()
>>             image_file = "%s_st%i_%i_%i_%i_box_%i.png" % (pf, star,
>>    xrot, yrot, zrot, ifile+j)
>>             write_bitmap(vals, image_file)
>>
>>    Thanks,
>>    Stella
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