New issue 1214: vector annotation of off-axis plot generates inconsistent result https://bitbucket.org/yt_analysis/yt/issues/1214/vector-annotation-of-off-ax... Suoqing Ji: Test dataset is [here](https://dl.dropboxusercontent.com/u/83265784/data.npy) Test script: ``` #!python import yt import numpy as np dims = (200,200,200) x = np.load('data.npy') field1 = x[:,2].reshape(dims, order="F") field2 = x[:,1].reshape(dims, order="F") field3 = x[:,0].reshape(dims, order="F") data = dict(velocity_x = field1, velocity_y = field2, velocity_z = field3) bbox = np.array([[-100, 99], [-100, 99], [-100, 99]]) ds = yt.load_uniform_grid(data, dims, 'km', bbox=bbox, nprocs=1) L = [0, -1, 0] north_vector = [0, 0, 1] slc1 = yt.OffAxisSlicePlot(ds, L, 'velocity_x', center=[0,0,0], width=(180,'km'), north_vector=north_vector) slc1.annotate_velocity(factor=40, normalize=True) slc1.save() L = [0, 1, 0] north_vector = [0, 0, 1] slc2 = yt.SlicePlot(ds, L, 'velocity_x', center=[0,0,0], width=(180,'km'), north_vector=north_vector) slc2.annotate_velocity(factor=40, normalize=True) slc2.save() ``` On-axis plot:  Off-axis plot: