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

[Renyue Cen]

Hi Sam,

I am using option (2) below without transpose (per your suggestion to fix the symmetric image problem)
and it does seem to point to the right (I have a bit trouble to decide exactly at which direction the galaxy 
is traveling even though I have its peculiar velocity, because I do not have information about 
the velocity of the volume it is in).

Thanks,
Renyue



On Jan 14, 2013, at 10:17 AM, Sam Skillman wrote:

> 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:
> 
> cam.snapshot('image1.png')
> 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.
> 
> Sam
> 
> 
> 
> 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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