Way to implement orthographic projection in plot3D

[Lyra-Cronin]

Hi,

Before meep transitioned to VisPy, Mayavi had options for orthographic projection. Looking at the VisPy documentation there are implementations for having different projections (https://vispy.org/api/vispy.scene.cameras.html), but I'm unsure on whether those have been implemented in meeps plot3D function, and if so how to use them. My apologies if this has an obvious answer but I couldn't see anything in the documentation and I'm still getting comfortable looking through the code to figure it out myself.

Thank you for any assistance :)