December 04, 2012, 07:55:21 pm
Currently best option is exporting your Chief Architect plan as a 3ds file, and importing into Sketch Up. After this point, you need to export this Sketchup model as a 'dae' file, and put into Lumion.
3ds is a quite outdated format, and can cause problems at times, but if you want to use other formats such as vrml, you will need non-free programs (3D Max,Autocad,etc.)
Here's a small,cheap, but very useful program that some Chiefers also use: http://www.micromouse.ca/
I didn't try this, but could do a good job. You may want to ask it on Chieftalk.