Let me take both of these questions on at once:
Modeling in Artlantis:
Yes, you can edit models and introduce scalable elements into Artlantis files, including sophisticated objects and primitives. Say you forgot a wall - just place a primitive block and size it appropriately.
Or - need to delete - easy.
Need to move something? No problem.
Need to amend something - easy to add an element.
[these things are all new features: convert an element into an object, then it is free to move… and love… as written about by Benny Benassi - who knew that they were playing songs about Artlantis in the clubs]
Artlantis has an automatic heliodon sky and what they call infinite ground to make up for a CAD model having a base that truncates at the property lines.
Workflo in Artlantis:
It also remediates from the original model acceptably well, so progress renderings can be made to follow along with design development.
So why do you need anything else???
I think Artlantis is the feline's night-garb when it comes to describing design, but for guys with more rendering time than productive design time, products like Cinema can deliver better results because they have better [and more complex] surface descriptors.
Cinema is a great program that I have dabbled with for many years, but it is nowhere as fast as Artlantis. At some point you need to decide if you are an illustration artist making top quality work or an architect - possessing the Artlantis attitude - making expedient design descriptions. Abvent have created and refined a very direct way to produce excellent results.
Dwight Atkinson