Hi William,

Both OffAxisProjectionPlot and off_axis_projection are just wrappers around yt's volume renderer using the ProjectionTransferFunction.

I’m not sure why you’re not getting good data with narrow depths, but you might try again by directly calling the volume renderer.  In any case, if you see the same thing it would give us more clues to figure out what is going wrong.

Also, if you have a test dataset that exhibits this behavior and you wouldn’t mind sharing, that would also be useful for us to debug this.

-Nathan 

On October 31, 2013 at 10:52:29 AM, William Gray (graywilliamj@gmail.com) wrote:

Hello yt-users,

I am having an issue in creating off axis projection plots with short depths in yt. I am looking for disks around particles which necessitates using the off axis projection functionality. What I want to do is create a projection where the depth is the same as or similar to the width of the plot. However, I am finding that unless the depth is orders of magnitude larger than the width I will always create a blank plot (for example, the width is ~100 au, the depth to get a plot has to be ~1000xwidth, I want a plot where the width and depth are ~100 au). I have tried using both off_axis_projection and the OffAxisProjection methods with similar (bad) results. 

As a comparison, I ran a low resolution FLASH simulation that did not seem to have this problem. I also know that such a plot was possible with ORION2 data in the recent past (spring of this year) since a colleague was able produce such a plot. That same script now also fails.

Does anyone know of a way around this problem? Has there been any recent changes that broke volume rendering for chombo/orion2 data? 

Thanks,
William Gray
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