1 . STL2SkUp.rb  (STL ASCII importer)
2 . SkUp2Ray.rb  (por and inc export)

These plugins are only tested on SketchUp 8 and SkUp Make 2017, the latest free
versions.
These two versions are still found by searching the web. The 8, in my opinion,
does the same things but is much lighter.
You don't need to install them, just copy them to the right folders and SkUp
will present the commands added to the File menu.
However, the folders on the two versions change.

SkUp 8 is easy
SketchUp\Plugins

A bit complicated SkUp Make 2017
....Users\YOURNAMEFOLDER\AppData\Roaming\SketchUp\SketchUp 2017\SketchUp\Plugins

At your risk but the plugins are absolutely clean (you can read yhe PLANE TEXT)

NOTE: the plugin for STL has a lot of code about colors, but the ASCII STL have
no colors. And binary STLs have a palette reduced to a subset of the truecolors.
For this reason I developed an addition in the ascii STLs to have colors and
transparency.
This addition does not cause problems for STL programs, they will ignore the
colors of the ascii STLs.
Soon I will present my parser to store colors in ascii STLs.
For now, maybe it is useful to someone, to load the STLs from the web (I
RECOMMEND ASCII), then color them as you like or modify them in SkUp, and then
generate the POV and/or INC files.
To be improved as you want.

NOTE 2 -
STL loading is VERY slow, see the counter at win bottom, but it's not my fault,
POV or INC saving is very fast instead
If you minimize SkUp while charging, it stops the counter in the status line.
But it's just a SkUp bug in the status, it keeps charging.
BR.
G.

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Attachments:
Download 'skup2ray.zip' (5 KB)

Hi! Sorry for late response.
First, I confirm that all of this works for Windows 10 Sketchup2017 if any such
feedback was even needed.

Then, the remarks in order of importance:

* 1 ISSUE: Visual clues to where any user action is possible are off :
    Users see an extension menu about this, but it only shows copyright.
    Then they go to standard Sketchup export options but it's not there.
    (could'nt it appear under the other listed file extensions, under 3D Model?
    ...Same for import, instead of having separate export)
* QUESTIONs:

    1)Why did you choose mesh instead of mesh2 syntax, which is supposed to
parse faster for POV, was the opposite actually true in your tests? or did you
prefer to go for simplicity?

    2)Did you try SU2POV 3.5, Didier Bur 's extension? ...which actually seems
to do a little more? like interfacing render launch... camera, etc.

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