Full disclosure: I am involved with the web presence of Phil's Hobby Shop.

Your previous post inspired me to add statistics to the software that powers PhilsHobbyShop.com. I have statistics, and Canada isn't even second place. It's USA, then someone else, then Canada. On the other hand, it could be that you're reporting a problem with the web software. Did something break when you went to PhilsHobbyShop.com, added an item to the cart, began checkout, and put in a non-U.S. shipping address? It doesn't appear so: the first order I saw when I logged in to an administrative interface was from (you guessed it) Ukraine.

Then how do companies like Amazon and eBay, with their worldwide presence, fend off these attacks?

If a stateless firewall blocks all packets from these countries on all protocols and all ports, this would result in end-user confusion when one visits a legitimate web site hosted in one of those countries.

More revenue. Lots more revenue.

Simple programs like Voxel Fun (Android) and Minecraft (PC) are introducing children to the concept of voxel sculpting. Or is there a huge step from that to mesh sculpting?

I made this, this, and this in Blender. That probably makes me an edge case.

Do shadows and glossy reflections still fool these automatic model builders?

So how is "ability to develop video games and tours of a structure that run without installation" not a "main problem"?

Over 30 percent of the store's sales is international. I checked.

That covers Windows, Mac, and Linux. But then you have to replace your computer with a Mac to test the Mac OS X version of an application, or if your current computer is already a Mac, you have to buy a Windows license to test the Windows version of your application if you didn't already have one to test your site in IE. And you also have to convince end users to trust, download, and install your applications, a barrier that a web application doesn't have. And on mobile, you have to buy one of each platform to test on, you have to pay per platform per year to target anything but Android, and Windows Phone doesn't use OpenGL at all.

It doesn't. The server uses the user agent to determine which platform the user is on and sends a link to download the native application compiled for the appropriate platform. Then the user uses the browser to download the native application and installs the native application on his computer.

Can you teach a 4th grader to make SVGs in Notepad?

At this point we're still at the stage where you have to draw your own fonts because a set of primitives to create the most basic 3D content isn't shipped with the platform. I agree that more work needs to be done, but waiting for a set of primitives before delivering a platform is like waiting for unanimous consent on the final color of the bike shed before beginning any construction.

It's not Facebook or Google+ or Twitter or webmail itself that needs to be 3D; it's more about what you Like or +1 or tweet about or Send Link.

Safari for iOS and Chrome for Android don't support browser plug-ins.

Because most businesses selling products through Amazon.com haven't laboriously modeled all the details of all the products that they sell in Blender. In some cases I've seen while working in online toy and hobby sales, you're lucky to have a flat picture at all because the seller outsources most of its warehousing to the distributor, and these distributors don't provide pictures for all products. So how do you recommend that these sellers efficiently build a mesh of each product with diffuse and specular textures? Are online sellers supposed to depend on manufacturers to provide these models when the manufacturers would prefer that end users visit a brick-and-mortar store than buy online?

Even if you have to do something that works on both the latest version of Chrome/Firefox and the latest version of Internet Exporer available for the latest service pack of Windows XP? The best strategy I've seen to handle advanced HTML5 features that don't polyfill well is to punt and require IE 8 users to install Google Chrome Frame.

You appear to be confusing two different definitions of "3D": projecting geometry onto a plane vs. display with binocular separation. See my other comment.

Running something natively generally involves crossing an end-user permission boundary. Remember ActiveX? Furthermore, more and more often, running something natively requires gaining permission from a multinational company to whom device owners have delegated the power of curation, such as Apple or the game console makers.

Because it provides a sandbox such that the permission boundary of downloading and installing a native application is not necessary.

The everyday life of the majority of people has a fractal dimension far closer to two than three. When you navigate the real world, you navigate in a plane, with one dimension north and south and the other dimension east and west. Even when you go up and down, it's typically in discrete units called "floors" or "stories" (spelled "storeys" in the Commonwealth) which can be regarded as separate planes.

Noninteractive "geometric projections of 3d scenes onto a 2d viewing plane", such as Mona Lisa, can be done server-side. Interactive ones, such as Quake, can be rebuilt for each client platform. True, duplicating effort for each client platform poses an entry barrier, but I can think of a few Slashdot users who regularly post comments showing a desire for entry barriers for anything interactive in order to protect end users from having their time wasted by a glut of novice productions.