Yup, Stephen wrote a set of boolean objects. http://yt-project.org/doc/analyzing/objects.html#boolean-data-objects http://yt-project.org/doc/cookbook/index.html#boolean-data-objects http://blog.yt-project.org/boolean-data-containers -Matt On Thu, May 31, 2012 at 2:01 PM, Geoffrey So <gsiisg@gmail.com> wrote:

Is there a way for yt to say, to remove a certain cells from an 3D object, say removing a small sphere from a big sphere or cube?  I guess cut_region() isn't the one.

From G.S.

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