DWG drawing integrity

[kromanenko]

I tried to open my drawing of my bike.
Looks that many curves from MAIN and THIN layers are lost while opening.
This drawing made of lines, arcs, circles and splines.

Actual:

Near expected. Autodesk online viewer also failed two show some arcs of front wheel rim :)

Also result from another online viewer:
https://gallery.proficad.eu/tools/SrvImg.ashx?p=2015-04-10_15-48-35_0797%2fdrw.Full.png
Drawing is also available: https://drive.google.com/file/d/0B8cQdxA1Np1PR3FoZDhDWm13VTA/view?usp=sharing

Built on commit 7e655c9 under Ubuntu 14.04 LTS.

[Rallaz]

To solve this "problem" are required math spline.

Added a hack to solve initialy.

[kromanenko]

It works much better. Only small spline in aft lights part remained invisible.

Also I tried it in DraftSight for reference. As far as i concerned it has officially licensed DWG support from Autodesk to Dassault.

Environment: branch head was reset to 90e2c72 "add hack to pass fit point as control point"

[Rallaz]

Really all splines are read ok, but have a difference in dxf to dwg
I think:

Rational spline (nurbs) in Dxf flag 12, and a list of control points
In Dwg flag 12, and a list of knot points and control points
Non-rational (bezier) in Dxf flag 8, and a list of knot points, control points and fit points
In Dwg flag 8, and only a list of fit points

The missing spline have only 3 fit points and require 5 control points to show

To solve are required a function to calculate the five control point using the 3 fit points stored in dwg

[DuncanLithgow]

I don't see anything for a bug report here. @Rallaz is this actually a bug? If Autodesks own reader shows the same problem then this is hardly a bug in LibreCAD. Please re-open this issue if there is a bug in the latest version of LibreCAD. Otherwise this looks like something for the forum.