SVG import more broken than before?

[tkbd]

Hi!, jcoppens
I write only the questions that I can answer.

- From Inkscape, saved as normal SVG and as 'Plain SVG'
- Tried as Open curve ('internal error') and Closed curve. Imports nodes but no curve info (i.e. shows just a straight line).

It probably will contains Bezier curve
When SVG file import dialog appeared ,did you try "Number of edge bisections" parameter to more than 2 ?
That time the curve is divided to multiple lines.
(I also use this tips to avoid error when make 3D Text primitive.)

- Tried to export from Inkscape as PS and EPS, import into Wings3d, with basically the same results (found a reference that PS/EPS import is broken?)

I also tried a PS / EPS file saved in Illustrator, but failded.

About these format:

• EPS format is a program-able format. (Like program code,it takes variouse forms, For example it might be contains while loop,function macro. )
  
• SVG format is a data set one kind of like XML(The structure of the data is determined from the beginning.).
  

So,about EPS,PS file, It seems to recognize only data that was made in a specific draw command.
(I have not read much code in detail of the svg importer...)
I expect it is the reason Wings 3D fails to load EPS/PS files.

- Same curve seems to import correctly in blender.

Blender can handle NURBS/Bezier curve and Path from imported data like Inkscape and Illustrator.

A separate question is why only closed curves/lines can be read?

Unfortunately,Wings can only handle polygons surface.
So these polygons must be surrounded by edgs( = this means closed line/curve).

I'd like to help debugging this but there's a language barrier (erlang) and absolute ignorance of debugging tools for same. I've installed erlang, and am starting a tutorial but I'd appreciate any useful pointers and suggestions!

I'm not programming specialist.
but I introduce the following pages used as studybooks. but The original page was lost already ;_;

• Exploring Wings3D through the Erlang Shell(for beginners) (from Web Archive)
  

• Erlang command shell (official site)
  

This info is useful for plugin module compile by alone

Cheers!