Matt, This is incredible and will be very useful. Nice job! Britton On Wed, Feb 9, 2011 at 6:49 PM, Matthew Turk <matthewturk@gmail.com> wrote:

Hi all,

Just wanted to let you know that I've put in experimental support for volume rendering using HEALpix to define the direction of vectors, all of which will then start at the camera location and then move radially outwards, to give a set of rays that cover the entire sky with equal area. ( http://healpix.jpl.nasa.gov/ )

This is not adaptive in any way; these rays will not split along their trajectories, which is broadly problematic. Additionally, the bricks are not sorted yet, so currently only projection transfer functions (column density) are supported. I'll add support for ordering the grids so that more complicated things that require inputs from previous bricks can be accomplished, but for now it's only useful for column density and averaging operations.

Anyway, if you're interested in playing with this, I've put up a script here:

http://paste.enzotools.org/show/1498/

And I've extracted portions of the healpy module that are necessary to plot a Molleweide projection, which can be found here:

http://yt.enzotools.org/files/mv.txt

note that once you download, you have to change mv.txt to mv.py. Attached is an image from one of the test simulations we used at the Enzo workshop, where I've tossed out nside=64 (12*64*64 vectors) out to a radius of 0.1 of the box. I then plotted the column density. This is the output from the linked script, above. This functionality is also able to do angular-averages of values, which is kind of cool (and what I am applying it to.)

My plan is to add correct ordering of grids, create a Molleweide projection that is small and works like other yt plots, and then to make it easier to generate and plot. If anybody wants to help out, I'd be appreciative -- particularly with the generation of projections and plotting of them.

-Matt

_______________________________________________ Yt-dev mailing list Yt-dev@lists.spacepope.org http://lists.spacepope.org/listinfo.cgi/yt-dev-spacepope.org

Hi Matt, This is AWESOME! Nice job! --Brian On Wed, Feb 9, 2011 at 6:49 PM, Matthew Turk <matthewturk@gmail.com> wrote:

Hi all,

Just wanted to let you know that I've put in experimental support for volume rendering using HEALpix to define the direction of vectors, all of which will then start at the camera location and then move radially outwards, to give a set of rays that cover the entire sky with equal area. ( http://healpix.jpl.nasa.gov/ )

This is not adaptive in any way; these rays will not split along their trajectories, which is broadly problematic. Additionally, the bricks are not sorted yet, so currently only projection transfer functions (column density) are supported. I'll add support for ordering the grids so that more complicated things that require inputs from previous bricks can be accomplished, but for now it's only useful for column density and averaging operations.

Anyway, if you're interested in playing with this, I've put up a script here:

http://paste.enzotools.org/show/1498/

And I've extracted portions of the healpy module that are necessary to plot a Molleweide projection, which can be found here:

http://yt.enzotools.org/files/mv.txt

note that once you download, you have to change mv.txt to mv.py. Attached is an image from one of the test simulations we used at the Enzo workshop, where I've tossed out nside=64 (12*64*64 vectors) out to a radius of 0.1 of the box. I then plotted the column density. This is the output from the linked script, above. This functionality is also able to do angular-averages of values, which is kind of cool (and what I am applying it to.)

My plan is to add correct ordering of grids, create a Molleweide projection that is small and works like other yt plots, and then to make it easier to generate and plot. If anybody wants to help out, I'd be appreciative -- particularly with the generation of projections and plotting of them.

-Matt

_______________________________________________ Yt-dev mailing list Yt-dev@lists.spacepope.org http://lists.spacepope.org/listinfo.cgi/yt-dev-spacepope.org