I have done some beta testing of the collada (.dae) file format export in BricsCAD v.14.2 beta for Linux and would like to share some results.
Attached is a rendering of an office building concept we are currently working with at OpenStudio arkitekter in Sweden.
Building model: BricsCAD for Linux
File exported from BricsCAD to collada (.dae) and converted in Accutrans 3D (running in wine) to wavefront (.obj)
Rendering: Thea Render
Vector post processing: Inkscape
Raster post processing: Gimp