Hi wim, it sounds like you're all sorted out now but just to answer your question:

> Why are C4D dxf files not usable in MoI? there are 3 options in C4D, polyline, solid &
> 3D Face, I tried them all, but no results. Even a single cube won't import, but is perfectly
> imported in other SW.

There are a lot of different possible types of data that can be stored in DXF files, like 2D drafting data such as lines, arcs, circles, but also polygon mesh data, encrypted ACIS solids, dimensions, and text.

MoI only tries to read in wireframe drafting data, and will only read in these entity types: LINE, CIRCLE, ARC, POINT, LWPOLYINE, POLYLINE (not the "polyface mesh" sub variant though), ELLIPSE, and SPLINE.

So likely the DXF file that you were trying to import had data stored in one of the other types of entities than what MoI reads in.



> there are 3 options in C4D, polyline, solid & 3D Face

So probably "polyines" uses a POLYLINE entity but with the "polyface mesh" variant of it which uses the vertices of a polyline to represent a polygon mesh rather than a curve type polyline. A "solid" is a 2D drafting entity in AutoCAD that is a filled polygon with 4 sides - MoI does not read that in currently because MoI does not have a "fill" type concept as of yet, and 3D face is an entity for a polygonal face with 3 or 4 sides, again since it's a polygon type entity MoI does not read it in currently.

- Michael