It was, perhaps, inevitable that Nintendo's unveiling of the 3DS was going to provoke an unseemly spat with Sony. The key advantage of Nintendo's 3D technology, after all, is that it requires no glasses - which means that in order for the company to blow its trumpet, it must by association knock the kind of glasses-required 3D on which Sony is presently making a very large wager.
The fairly apparent bitterness emanating from the Sony camp over this issue is entirely understandable. After all, it's not just the PlayStation division which is hoping for an upswing in its fortunes from the consumer adoption of 3D - the firm's television business, too, is hoping that 3D will be its white knight after many years of tough trading, and Sony Pictures would love to see Blu-Ray sales picking up as 3D versions of popular movies arrive at retail.
As such, for a big competitor like Nintendo to be making sniffy comments about 3D glasses is somewhat upsetting for Sony - and it stings all the more because of the sympathetic coverage which Nintendo's viewpoint has received, both from the press and from consumers.