matrix_ghost you think they can convert watter and sand to 3D? or flowers for example? everytime they will have something that has a complex shape they will have trouble.
Water in 3d looked quite cool when i watched harry potter and the order of the phoenix in IMAX 3d.
Flowers ....i thought were also pretty well done Alice in Wonderland. But if you think about it also in Avatar we didn't have scenes with flowers constantly popping up. In alot of scenes the the plant life was put in the background with the characters in the front getting th 3d treatment.
You are right in saying that complex shapes will definately take more to recreate in 3d. And that also applies to camera moves. But remember that Cameron also had quite complex camera moves in Titanic and he's also converting that in 3d. So yeah....
The point is that if you want the best results , you'll need
1) to shoot the movie in 3-d
2) to also have a director who understands the process.
But even so i think that what i have seen with Potter and AIW , the results were pretty good. Hence why i used IMAX as an example. Ideally the best results would be if a movie would have entire sequences or better yet the entire movie shot with an IMAX camera. It's a pain for the VFX but the results are stellar. But practical complications lead studios to simply convert the movie to the IMAX format.
You are right in saying that converions can lead to problems. IMAX has the advantage that they themselves have the monopoly on giant screens as well converting movies. So they know that something they'll churn out will be of high quality. It's a different thing with 3d conversions because there are many companies out there who offer conversion services. If studios are willing to pay the price you'll get good results. The problem can be that some studio decides not pay alot of money or chooses a lesser company and you go back to the original problems that plagued 3d ( eye strain etc.)
But even so i think studios are smart to convert their big budget blockbusters to 3d because they know that they can increase the profits big time there as well warrant the investment . For example a studio exec. can think that he may want to spend 15 million to convert Alice in WOnderland and spend 15 million to convert a horror movie like Saw. But which movie will have a bigger audience