I think that the only possible "natural" orientation and placement should be taken from the existing
4-4cyli primitive.
This means:
- the Y axis is the "sweeping" axis, along which the primitive will be "swept" along the desired path
- the swept thing should have its top at Y==0
- if possible, analogously the bottom should be at Y==1
- the same should be used for non-swept (static) START and END files
This exact standard placement and usage is also what LSYNTH uses,
to which a maximum compatibility should be tried to achieved IMHO.
PS I'm used to the term "sweeping" here because in my wild youth I took over this term from
the POVRay documentation, e.g. at http://www.povray.org/documentation/view/3.6.1/63/
4-4cyli primitive.
This means:
- the Y axis is the "sweeping" axis, along which the primitive will be "swept" along the desired path
- the swept thing should have its top at Y==0
- if possible, analogously the bottom should be at Y==1
- the same should be used for non-swept (static) START and END files
This exact standard placement and usage is also what LSYNTH uses,
to which a maximum compatibility should be tried to achieved IMHO.
PS I'm used to the term "sweeping" here because in my wild youth I took over this term from
the POVRay documentation, e.g. at http://www.povray.org/documentation/view/3.6.1/63/