[yt-users] a question on camera with volume rendering

Sam Skillman samskillman at gmail.com
Mon Jan 14 07:17:53 PST 2013

Hi Renyue,

It depends a bit on how you are saving the image, unfortunately.  If you
are using a recent changeset of yt (after 2.4 where the transpose causes
symmetric images on some compilers/machines), and you save with:

Then image1.png will have north pointing up.

If you did:
im = cam.snapshot()
write_bitmap(im, 'image2.png', tranpose=False)
Then image2.png will have north pointing right.

If you did
im = cam.snapshot()
write_bitmap(im, 'image3.png', transpose=True)
Then image3.png will have north pointing up.

I am working on ways to make sure that it always points up by using the new
ImageArray class, but have not come up with the full solution yet.  I hope
that description helps.


On Sat, Jan 12, 2013 at 8:12 PM, Renyue Cen <cen at astro.princeton.edu> wrote:

> Hi,
> I think I am unclear about the orientation in pf.h.camera(c,W,L, ...,
> north=vec, ...).
> I  got some nice looking pictures but don't know what north means in this
> case,
> because when I switch north=vec to north=reverse of vec, the image rotates
> along the vertical direction,
> so it seems like north is pointing to either left or right.  It is very
> desirable for me to be able
> to make sure which direction vec points to (vec is the vec in north=vec)
> in the final rendered plot.
> Thanks in advance for help,
> Renyue
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