
Hi, I'm new to yt and this list, so I apologize if this question has been answered before. I'm trying to render a non-cubical volume (observational data: see an early attempt at https://vimeo.com/67421373). If I supply a scalar "resolution" to Camera.__init__, the output is a square, even though the input data is ~2x wider than it is tall. If I supply a tuple of values, I can manually stretch the image but, as you can tell from the movie, I want to spin around the volume. I don't think that messing with resolution will help me in this case, since the projected aspect ratio of the plot changes at each rotation step. I did find an old thread similar to this ( http://lists.spacepope.org/pipermail/yt-users-spacepope.org/2012-July/002793...), but the recipe there seem specific to axis-aligned slices, and not generic rotations. Is there a natural way to force yt to render pixels with the "right" aspect ratio? Thanks, Chris -- ************************************ Chris Beaumont Graduate Student Institute for Astronomy University of Hawaii at Manoa 2680 Woodlawn Drive Honolulu, HI 96822 www.ifa.hawaii.edu/~beaumont ************************************

Hi Chris, You can set the aspect ratio of your volume via the bbox keyword for load_uniform_grid. See the example in load_uniform_grid's docstrings: bbox : array_like (xdim:zdim, LE:RE), optional Size of computational domain in units sim_unit_to_cm
arr = np.random.random((128, 128, 129)) data = dict(Density = arr) bbox = np.array([[0., 1.0], [-1.5, 1.5], [1.0, 2.5]]) pf = load_uniform_grid(data, arr.shape, 3.08e24, bbox=bbox, nprocs=12)
I'm not sure whether the volume renderer will use non-cubic voxels, but this should be an easy thing to modify and double check on your end. Cheers, Nathan On Tue, Jun 4, 2013 at 11:59 AM, Chris Beaumont <cnb4ster@gmail.com> wrote:
Hi,
I'm new to yt and this list, so I apologize if this question has been answered before.
I'm trying to render a non-cubical volume (observational data: see an early attempt at https://vimeo.com/67421373). If I supply a scalar "resolution" to Camera.__init__, the output is a square, even though the input data is ~2x wider than it is tall. If I supply a tuple of values, I can manually stretch the image but, as you can tell from the movie, I want to spin around the volume. I don't think that messing with resolution will help me in this case, since the projected aspect ratio of the plot changes at each rotation step.
I did find an old thread similar to this ( http://lists.spacepope.org/pipermail/yt-users-spacepope.org/2012-July/002793...), but the recipe there seem specific to axis-aligned slices, and not generic rotations.
Is there a natural way to force yt to render pixels with the "right" aspect ratio?
Thanks, Chris
-- ************************************ Chris Beaumont Graduate Student Institute for Astronomy University of Hawaii at Manoa 2680 Woodlawn Drive Honolulu, HI 96822 www.ifa.hawaii.edu/~beaumont ************************************
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Thanks, Nathan. That does the trick cheers, chris On Tue, Jun 4, 2013 at 3:10 PM, Nathan Goldbaum <nathan12343@gmail.com>wrote:
Hi Chris,
You can set the aspect ratio of your volume via the bbox keyword for load_uniform_grid. See the example in load_uniform_grid's docstrings:
bbox : array_like (xdim:zdim, LE:RE), optional Size of computational domain in units sim_unit_to_cm
arr = np.random.random((128, 128, 129)) data = dict(Density = arr) bbox = np.array([[0., 1.0], [-1.5, 1.5], [1.0, 2.5]]) pf = load_uniform_grid(data, arr.shape, 3.08e24, bbox=bbox, nprocs=12)
I'm not sure whether the volume renderer will use non-cubic voxels, but this should be an easy thing to modify and double check on your end.
Cheers,
Nathan
On Tue, Jun 4, 2013 at 11:59 AM, Chris Beaumont <cnb4ster@gmail.com>wrote:
Hi,
I'm new to yt and this list, so I apologize if this question has been answered before.
I'm trying to render a non-cubical volume (observational data: see an early attempt at https://vimeo.com/67421373). If I supply a scalar "resolution" to Camera.__init__, the output is a square, even though the input data is ~2x wider than it is tall. If I supply a tuple of values, I can manually stretch the image but, as you can tell from the movie, I want to spin around the volume. I don't think that messing with resolution will help me in this case, since the projected aspect ratio of the plot changes at each rotation step.
I did find an old thread similar to this ( http://lists.spacepope.org/pipermail/yt-users-spacepope.org/2012-July/002793...), but the recipe there seem specific to axis-aligned slices, and not generic rotations.
Is there a natural way to force yt to render pixels with the "right" aspect ratio?
Thanks, Chris
-- ************************************ Chris Beaumont Graduate Student Institute for Astronomy University of Hawaii at Manoa 2680 Woodlawn Drive Honolulu, HI 96822 www.ifa.hawaii.edu/~beaumont ************************************
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Excellent, happy volume rendering! I'd love to see the final product once you've finished tweaking your volume rendering script :) On Wed, Jun 5, 2013 at 11:53 AM, Chris Beaumont <cbeaumont@cfa.harvard.edu>wrote:
Thanks, Nathan. That does the trick
cheers, chris
On Tue, Jun 4, 2013 at 3:10 PM, Nathan Goldbaum <nathan12343@gmail.com>wrote:
Hi Chris,
You can set the aspect ratio of your volume via the bbox keyword for load_uniform_grid. See the example in load_uniform_grid's docstrings:
bbox : array_like (xdim:zdim, LE:RE), optional Size of computational domain in units sim_unit_to_cm
arr = np.random.random((128, 128, 129)) data = dict(Density = arr) bbox = np.array([[0., 1.0], [-1.5, 1.5], [1.0, 2.5]]) pf = load_uniform_grid(data, arr.shape, 3.08e24, bbox=bbox, nprocs=12)
I'm not sure whether the volume renderer will use non-cubic voxels, but this should be an easy thing to modify and double check on your end.
Cheers,
Nathan
On Tue, Jun 4, 2013 at 11:59 AM, Chris Beaumont <cnb4ster@gmail.com>wrote:
Hi,
I'm new to yt and this list, so I apologize if this question has been answered before.
I'm trying to render a non-cubical volume (observational data: see an early attempt at https://vimeo.com/67421373). If I supply a scalar "resolution" to Camera.__init__, the output is a square, even though the input data is ~2x wider than it is tall. If I supply a tuple of values, I can manually stretch the image but, as you can tell from the movie, I want to spin around the volume. I don't think that messing with resolution will help me in this case, since the projected aspect ratio of the plot changes at each rotation step.
I did find an old thread similar to this ( http://lists.spacepope.org/pipermail/yt-users-spacepope.org/2012-July/002793...), but the recipe there seem specific to axis-aligned slices, and not generic rotations.
Is there a natural way to force yt to render pixels with the "right" aspect ratio?
Thanks, Chris
-- ************************************ Chris Beaumont Graduate Student Institute for Astronomy University of Hawaii at Manoa 2680 Woodlawn Drive Honolulu, HI 96822 www.ifa.hawaii.edu/~beaumont ************************************
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I'll send it your way :) chris On Wed, Jun 5, 2013 at 3:10 PM, Nathan Goldbaum <nathan12343@gmail.com>wrote:
Excellent, happy volume rendering! I'd love to see the final product once you've finished tweaking your volume rendering script :)
On Wed, Jun 5, 2013 at 11:53 AM, Chris Beaumont <cbeaumont@cfa.harvard.edu
wrote:
Thanks, Nathan. That does the trick
cheers, chris
On Tue, Jun 4, 2013 at 3:10 PM, Nathan Goldbaum <nathan12343@gmail.com>wrote:
Hi Chris,
You can set the aspect ratio of your volume via the bbox keyword for load_uniform_grid. See the example in load_uniform_grid's docstrings:
bbox : array_like (xdim:zdim, LE:RE), optional Size of computational domain in units sim_unit_to_cm
arr = np.random.random((128, 128, 129)) data = dict(Density = arr) bbox = np.array([[0., 1.0], [-1.5, 1.5], [1.0, 2.5]]) pf = load_uniform_grid(data, arr.shape, 3.08e24, bbox=bbox, nprocs=12)
I'm not sure whether the volume renderer will use non-cubic voxels, but this should be an easy thing to modify and double check on your end.
Cheers,
Nathan
On Tue, Jun 4, 2013 at 11:59 AM, Chris Beaumont <cnb4ster@gmail.com>wrote:
Hi,
I'm new to yt and this list, so I apologize if this question has been answered before.
I'm trying to render a non-cubical volume (observational data: see an early attempt at https://vimeo.com/67421373). If I supply a scalar "resolution" to Camera.__init__, the output is a square, even though the input data is ~2x wider than it is tall. If I supply a tuple of values, I can manually stretch the image but, as you can tell from the movie, I want to spin around the volume. I don't think that messing with resolution will help me in this case, since the projected aspect ratio of the plot changes at each rotation step.
I did find an old thread similar to this ( http://lists.spacepope.org/pipermail/yt-users-spacepope.org/2012-July/002793...), but the recipe there seem specific to axis-aligned slices, and not generic rotations.
Is there a natural way to force yt to render pixels with the "right" aspect ratio?
Thanks, Chris
-- ************************************ Chris Beaumont Graduate Student Institute for Astronomy University of Hawaii at Manoa 2680 Woodlawn Drive Honolulu, HI 96822 www.ifa.hawaii.edu/~beaumont ************************************
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participants (3)
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Chris Beaumont
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Chris Beaumont
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Nathan Goldbaum