Fix error message for failed object conversion

[voneiden]

The original cad_objs will just log an empty list. Assuming the original intent was to log cad_obj instead.

Noticed this while exploring voneiden/cq-cam/issues/23

As a side note, looks like adding support for AIS objects might be a bit involved. We got two visualization options in cq-cam, AIS based and Edge based. AIS was originally used because it allows connecting lines of different colours using AIS_MultipleConnectedInteractive. However I'd be willing to research a bit if the edge based visualization can be improved to make AIS visualization redundant.

[bernhard-42]

Thanks for fixing it!

I am not familiar with AIS (and ocp_tessellate is not using AIS).
What do you want to achieve from a user perspective?

[voneiden]

Yeah no worries, I'll see what I can do. cq-cam allows generating CNC machining toolpaths on cadquery parts, so I'm using AIS to visualize the various generated paths. For example something like this

Besides getting better colour control, I have a faint memory that there may have been a performance benefit from using AIS, but I'll need to reinvestigate this.