3d plot only partly shown using png backend
Summary
When plotting a 3d image using the png backend, only a part of the whole plot is displayed.
Steps to reproduce
import empyre as emp
from mayavi import mlab
import numpy as np
mlab.init_notebook('png')
test = emp.fields.Field(np.ones((20,20,20)))
emp.vis.mask3d(test)
What is the current bug behavior?
Only the lower left quarter of the image is shown, the rest stays black.
What is the expected correct behavior?
The full image should be visible.
Relevant logs and/or screenshots
Edited by Alexander Clausen