Hi Kuo-Chuan, Sorry to hear it didn't work for you! Do you think you could help us out with a bit more information, and then we'll see if we can get it working for you? * What is the exact value of back_center that you find? * What is the physical size of your domain? * What is the width you supplied to the volume_rendering object? It might also be easier if you could try it with the "Camera" interface as described here: http://yt.enzotools.org/doc/visualizing/volume_rendering.html#volume-renderi... That should allow for a bit more flexibility in describing the scene, and may help us narrow down the error. Best wishes, Matt On Thu, Feb 24, 2011 at 5:12 AM, Kuo-Chuan Pan <kpan2@astro.illinois.edu> wrote:

Dear Sir/Madam,

I am new in yt and trying to visualize my FLASH simulation data (3D) with volume rendering. I followed the cookbook in:

   http://hg.enzotools.org/cookbook/raw-file/tip/recipes/simple_volume_renderin...

However I got an error message:

 File "/home/kpan2/softwares/yt-x86_64/src/yt-hg/yt/visualization/volume_rendering/software_sampler.py", line 110, in ray_cast    LE = na.array(LE) - self.back_center ValueError: shape mismatch: objects cannot be broadcast to a single shape

I looked the software_sampler.py file and found all LE, RE, self.bricks are empty lists ( = []), but self.back_center is not and correct. I guess there are some problems when setting self.bricks.

If anyone has any suggestions, I would be very happy to hear. Thank you.

Best regards, Kuo-Chuan _______________________________________________ yt-users mailing list yt-users@lists.spacepope.org http://lists.spacepope.org/listinfo.cgi/yt-users-spacepope.org