Archicad 3D model export to CATT acoustic software

[judeswings]

Hello!

I am currently trying to export a 3D model of a small room from Archicad to CATT-Acoustic, which only accepts DXF. or .OBJ file formats, but for some reason the 3D model is read as polylines rather than faces/singular surfaces and gives this wonky look.

Here's what I've done so far:

1) I tried saving the file as a .3DS and opening it in Autocad to save it as a .DXF, then converting it in CATT--which gave over 1000 polylines and corners and ultimately made the program crash.

2) I tried converting the 3D model into a morph, saving the file as a .3DS and opening it in Autocad to save it as a .DXF, then converting it in CATT--which gave less polylines than the previous, but still, the program crashed. 

3) I tried converting it to an .OBJ file format, then downloading an extension (obj2catt) to convert it, but that gave a bunch of errors and crashed the system.

4) I tried opening the .OBJ and importing it to my embedded library as a new object in Archicad, then exporting it to Autocad, then CATT.

5) I tried exporting the 3D morph to Blender and Autocad to try joining the polylines or creating a singular planar surface, but since its imported, it couldn't merge them (or maybe I am too inexperienced to figure it out)

and God know what else I've tried...I'm open to ANY ideas PLEASE because every solution I've come up with has given me the same result. 

 

Operating system used: Windows

[CosminF]

you can simplify the triangulation and obtain quads or other polygons by decimating the geometry as previously mentioned.