New issue 1256: OffAxisProjection Fails to find proper dataset limits https://bitbucket.org/yt_analysis/yt/issues/1256/offaxisprojection-fails-to-... Cameron Hummels: In trying to generate some OffAxisProjections from outside of the simulation domain, I've stumbled on some problems with auto-determination of field extrema. This simple script demonstrates: ``` #!python import yt ds = yt.load("IsolatedGalaxy/galaxy0030/galaxy0030") yt.OffAxisProjectionPlot(ds, [1., 1., 0.5], 'density', [0.5, 0.5, 0.5], 1.5, north_vector=[0., 0., 1.]).save() ``` yields this STDERR: ``` #!python yt : [INFO ] 2016-08-05 16:38:13,256 Parameters: current_time = 0.00600002000283 yt : [INFO ] 2016-08-05 16:38:13,256 Parameters: domain_dimensions = [32 32 32] yt : [INFO ] 2016-08-05 16:38:13,256 Parameters: domain_left_edge = [ 0. 0. 0.] yt : [INFO ] 2016-08-05 16:38:13,257 Parameters: domain_right_edge = [ 1. 1. 1.] yt : [INFO ] 2016-08-05 16:38:13,257 Parameters: cosmological_simulation = 0.0 ^MParsing Hierarchy : 0%| | 0/173 [00:00<?, ?it/s]^MParsing Hierarchy : 100%|##########| 173/173 [00:00<00:00, 20876.19it/s] yt : [INFO ] 2016-08-05 16:38:13,287 Gathering a field list (this may take a moment.) yt : [INFO ] 2016-08-05 16:38:15,246 xlim = -0.750000 0.750000 yt : [INFO ] 2016-08-05 16:38:15,246 ylim = -0.750000 0.750000 yt : [INFO ] 2016-08-05 16:38:15,246 zlim = -0.500000 0.500000 yt : [INFO ] 2016-08-05 16:38:15,250 Making a fixed resolution buffer of (('gas', 'density')) 800 by 800 /Users/chummels/src/yt-x86_64/src/yt-hg/yt/units/yt_array.py:964: RuntimeWarning: overflow encountered in multiply np.multiply(self, oth, out=self) yt : [WARNING ] 2016-08-05 16:38:16,264 Plot image for field ('gas', 'density') has both positive and negative values. Min = -inf, Max = 54704375419815931049795757413255569402681538393870135161391039774901627123390825374482250621889063954180467028564003619350195202205284149300884842122024669609440680126995877926691701507872243776797761225104772892079277541233926298501475834441217774443211945332828680339300087327793097590112761046546513920.000000. yt : [WARNING ] 2016-08-05 16:38:16,264 Switching to symlog colorbar scaling unless linear scaling is specified later ``` which results in this image:  Interestingly, I don't get this problem with different datasets, or with different views of *this* dataset, so I'm not entirely sure what is going on. Here is the output of the same script using the `enzo_cosmology_plus/RD0009/RD0009` dataset: