Hi Christian,

I add the sink particles at the end of the rendering by recoloring pixels at their locations. E.g.
vals = cam.snapshot()
maxv = vals.max()
for k in range(-3,3):  # Make a cross in green
                        (vals[px+k][py])[1] = .9*maxv
                        (vals[px][py+k])[1] = .9*maxv
where I've calculated the x,y index where a given sink particle is. 

Stella



On Tue, Oct 30, 2012 at 5:03 PM, Matthew Turk <matthewturk@gmail.com> wrote:
Hi Christian,

There is a way to get particles added to a rendering, but right now
it's a bit funny.  Are you interested in textual annotations?  If so,
you may want to try out using matplotlib directly on the image that
comes out of a volume rendering snapshot.  I'm sorry I don't have much
else to offer about this, but if you describe in a bit more detail
what you're looking for maybe there's something in yt that can help.

-Matt

On Tue, Oct 30, 2012 at 8:35 AM, Christian Karch
<christian.karch@posteo.de> wrote:
> Hi everyone,
>
> is there a simple way to annotate sinkparticles (x, y, z) in the rendering?
> I thought about to define spheres and combine the regions with boolean "or",
> but I have no idea to show density (or another field) and accent the
> sinkparticles. I hope you can help me with this issue.
>
> regards
> Christian
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