Several compatibility issue

[maxime-rey]

Hello,
I think there are some minor changes to do that hopefully may help others in the future and a problem for which I haven't found the solution. All I did for these errors to occur was to test the "Example 1: Basic functions introduction" from the website of opticspy.

---

• If you have the message No module named 'aperture' , the problem comes from the version installed, you installed the python 2 version and are using it as a python 3.
-- "pip install" installed the Python 2 version. I don't know how it works but it may need to be updated.
-- on http://opticspy.org/, the link to download it is also for Python2 (even though in this case it's more obvious that it's 2)
Solution → clone the repo on git and run python setup.py install (or replace python by python3 if you have python 2 as default).

• No module named 'lens'
Solution → go into opticspy/ray_tracing/codev.py and replace import lens by from . import lens.

• No module named glass
Solution → go into the file from which you installed if you cloned and in ray_tracing/ you should find a folder glass_database. Copy it and paste it where opticspy has been installed (it should be written on the error message)

• Now this is the error for which I didn't find the solution. When trying to trace the rays with draw.draw_system(New_Lens), the error local variable 'verts' referenced before assignment is returned. The source of the problem is the following. It's in /opticspy/ray_tracing/draw.py in draw_surface(r, x0, d1, d2).

      27         verts = [[verts_1[-1][0],d2/2]] + verts_1[::-1] + verts_2[1:] + [[verts_2[-1][0],-d2/2]]
      28     codes.append(Path.MOVETO)
--->  29     for j in range(len(verts)-1):
      30         codes.append(Path.LINETO) 

I tried to rename it and reassign a value before in case there was a problem with a global variable which had the same name but it doesn't seems to be it.

---

I hope this message belongs here, isn't too long and will be helpful for some !

[FabioGentile88]

I had a similar problem. When prompting dict_list = trace.trace_draw_ray(New_Lens) draw.draw_system(New_Lens)
I got the error AttributeError: module 'trace' has no attribute 'trace_draw_ray' I solved the problem (inspired from your very post, so yes your message was useful! 👍 ) modifying import trace into from . import trace in draw.py .
Maybe is still some doggy library importing issue?! [Hope it helps]