Hi Enrico,
I beta tested both, so can talk about a few of your questions.
First, it is essential to understand that iVisit 3D and BIMx are completely different solutions.
With BIMx, everything about your model must be done inside of ArchiCAD - all texturing, all entourage, etc. and any 'glitches' must be fixed there. You then export all or part of your model and the client can view the 3D model in any way they choose, looking at every nook and cranny of the model and with only the global illumination provided by BIM Explorer (if you choose to compute GI).
With iVisit 3D, you use the workflow you are currently using - typically texturing in Artlantis, generating all lighting, radiosity, background and additional 3D entourage - setting up a render as now - to be as great or as simple as you require. But, the export is simply a panorama - the same as old QT Panoramas, but now these are done with Flash for the web and Android ... and with iVisit for iPhone/iPad. Well, not 'simply' a panorama: you can generate a stand-alone pano, but you can generate a collection of linked panos and an overview floor plan, so that the user can navigate from viewpoint to viewpoint in a project as you envision.
You can make an iVisit pano much more lush and realistic than any BIMx model, because of the power of Artlantis.
But, the viewer can only see the panorama - or the linked panoramas, which provide a guided tour of your project. They can only see what you show them. Big difference.
Dwight has posted many times on a similar difference in presentation methods: he often compares people generating a flythrough animation buzzing a person through a project to those generating a slideshow of sumptuous images fading into one another, guiding a person through an emotional presentation of the project. In some ways, BIMx is more like the flythrough movie (although not really of course - the user can navigate where they want on their own through the whole model) ... and the panorama is more like the guided slideshow - since you only produce panos of the scenes/viewpoints you want to showcase.
Cost and Time...
The upgrade to Artlantis 4 costs more than the ArchiPlus price for BIMx - but as you know, Artlantis does so much more in terms of powerful shaders, entourage, fixing surface material glitches, illumination, etc etc - and Studio can produce not only images, but animations, VR objects and panos. Still, cost advantage is to BIMx.
Generating a radiosity solution for a panorama in Artlantis can be much faster than generating a global illumination solution in BIM Explorer - and with far superior results. Particularly since you can use the batch render to produce your collection of panos for a multimode pano project, I give the time advantage to Artlantis.
Viewer cost: BIMx for IOS is free. iVisit 3D viewer is $20 per client. (No cost to view panos in a web browser.) iVisit 3D Lite is free, but only allows you to look at one pano per day just to evaluate. Cost advantage here is BIMx.
Coolness factor: personal taste! Personally, I find iVisit 3D on an iPhone 4 or faster or an iPad 2 to be totally cool. Manually navigating a beautifully rendered panorama is nice, but turning on gyroscopic mode and making your IOS device a dynamic window into a virtual world is way cool IMHO. Turn in place or look up and down, and the screen of your IOS device is like a window into your virtual scene. Others may find BIMx more cool because you can navigate anywhere through the 3D model, walking up stairs, through doors - and not through walls (unless fly is enabled), etc.
Usability by tech-limited, non-gamer clients: I think iVisit would be easier for this kind of non-techie person to experience a project in a persuasive, non-frustrating way... they cannot get stuck in a closet, for example.
😉
Different tools, different presentation capabilities. Ideally, get both.
🙂
Cheers,
Karl
Edit: about the iPhone 4 or faster or iPad 2 or faster for iVisit 3D: that only applies to using the virtual gyroscopic viewing method. Any IOS device works absolutely fine and smoothly for manual panning with gestures. If in doubt, download iVisit 3D Lite and a sample model and test the performance on your device. BIMx is of course free, with sample models available too, so easy for people to test performance there also.
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