Li, So are you saying to use a slice, get a contour, e.g. with get_contour, and then use grid_points_in_poly()? I suppose that could work for part of the volume, but I would question its effectiveness for my case (quasi-spherical surface in 3D cartesian coordinates) in regions where the slice and surface are close to parallel. If I could get surfaces that are, say phi=const. surfaces, that include the origin then that could work, but then that require an interpolation onto each grid, and to cover all the voxels, I'd need many surfaces. A different thought I had was to generate a ray using methods in yt, for each voxel and find the outermost position along the ray where the surface value is obtained. That could also be very slow, but for my case, I could limit it by only doing that calculation for voxels where the value (in my case pressure) is below the surface value, since all the voxels with pressure above that value, are inside the outer surface.
It would be nice to have a more general solution if such a thing exists (which seems likely). Regards, Jon On Sun, Oct 23, 2016 at 9:15 PM, Lee Chen <lchen...@gmail.com> wrote: > This is an interesting question. Can you try to use grid_points_in_poly() > for each slice of 3D. It may be slower. I think there is a mathematical > extension on this. But I do not know the actual formula. > > Li Chen > www.udc.edu/prof/chen > > > Does anyone know SciKit work with Spark (Python version)? > > > On Tue, Oct 18, 2016 at 1:57 PM, Slavin, Jonathan <jsla...@cfa.harvard.edu > > wrote: > >> Hi all, >> >> I'm wondering if there is some routine that will do in 3D what >> grid_points_in_poly() does in 2D. That is, I'd like to use the results of >> a call to marching_cubes(), i.e. an array of verts, and determine which >> grid points in the input volume that was provided as input to >> marching_cubes are inside of the surface defined by those verts. Any help >> would be appreciated. >> >> Regards, >> Jon >> >> -- >> ________________________________________________________ >> Jonathan D. Slavin Harvard-Smithsonian CfA >> jsla...@cfa.harvard.edu 60 Garden Street, MS 83 >> phone: (617) 496-7981 Cambridge, MA 02138-1516 >> cell: (781) 363-0035 USA >> ________________________________________________________ >> >> >> _______________________________________________ >> scikit-image mailing list >> scikit-image@python.org >> https://mail.python.org/mailman/listinfo/scikit-image >> >> > -- ________________________________________________________ Jonathan D. Slavin Harvard-Smithsonian CfA jsla...@cfa.harvard.edu 60 Garden Street, MS 83 phone: (617) 496-7981 Cambridge, MA 02138-1516 cell: (781) 363-0035 USA ________________________________________________________
_______________________________________________ scikit-image mailing list scikit-image@python.org https://mail.python.org/mailman/listinfo/scikit-image
