Coordinate systems of bridle and obj file can diverge

[ufechner7]

The origin and orientation of the wing OBJ file and the coordinates of the bridle points in the YAML file can differ. This can cause hidden errors that are difficult to spot.

TODO:

• define and document which origin and orientation shall be used
• add consistency checks when creating a sys_struct (or sam) instance

They diverge for example for the ram-air-kite example.

[1-Bart-1]

In the next VortexStepMethod release, .obj files will be analized and written to yaml files, so they get the same file format as the V3 kite examples currently use. The PR for this:
OpenSourceAWE/VortexStepMethod.jl#249

When this is merged / released, it will be a lot easier to compare the aerodynamic geometry with the structural geometry yaml file.

The .obj and the yaml files should all be in the same frame (called the CAD frame). It can be oriented in any way, but all files should share a common origin and orientation.