Modern magic: World's first 3D-printed castle

This castle was built with magic -- the technological kind. Andrey Rudenko

A castle materializes out of thin air without hundreds of stone chiselers putting in decades of hard labor to make it happen. Is it the plot of a new Disney film?

Nope. It's what happened recently in Minnesota -- and the wizard who whipped up this magic castle was Andrey Rudenko, a contractor with a background in engineering.

Instead of using spells and potion to bring his castle into this world, Rudenko used something much more concrete. In fact, he actually used concrete extruded through a 3D printer he designed himself. Getting that concrete to the right consistency to be fed through the machine was quite a challenge Rudenko told CNET. "Although cement has existed for thousands of years," he said, "it hasn't been common to use cement mixes for low-speed precise extrusion. It took a lot of research and experimenting to come up with the proper mix. So the recipe is my own with common materials and some additives."

Rudenko's castle isn't quite big enough to house evil queens or hold royal balls, but the structure is quite impressive, measuring 10 by 16 feet with a height of 12 feet -- just think of the coolest castle playhouse you've ever seen. Then again, Rudenko's goal in creating the castle wasn't to make a livable structure. It was to act as a sort of proof of concept for the 3D printer and concrete extruding process he'd invented, so that he could move on to his real goal: printing an entire 3D house.

Related stories Giant 3D printer starts spitting out a house Girl wants a dragon, so scientists make one Is 3D printing the future of home building? "A new era of architecture is inevitable, and I'm excited to see where the next few years will lead in terms of construction and design," Rudenko says on his website. "I have previously been sure I could print homes, but having finished the castle, I now have proof that the technology is ready."

According to the site, Rudenko is currently refining his printer so that it will be up to the task. The current machine, which according to 3Dprint.com (which first reported Rudenko's plans back in April), is based on the RepRap project, an open-source 3D printer that, once made, can be modified extensively and even be used to reproduce itself. Rudenko says that the printer can pump out layers that are 10 millimeters in height by 30 millimeters in width but that "countless other options are available with just the click of a button."

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What's next for Unity, one of the world's most widely used game making tools (Q&A)

David Helgason, Unity's CEO, in a promotional video in 2013 Unity

When Monument Valley shot to the top of Apple's App Store in April, it was something of a coup.

The game, made by an eight-person development team at Ustwo in the UK, had grabbed the app world's attention with its M.C. Escher-inspired puzzles The company's $3.99 app defied convention, first by charging cash instead of offering an initially free download, and then by gaining attention so quickly where most successes climb the stores rankings slowly.

It also notched another success for Unity. The San Francisco company, which builds tools to help developers make apps and games that work across a range of devices, has been slowly taking over the coding world. Today, nearly half of mobile game developers are using Unity, the company says. The company's influence is growing outside games as well, extending to desktop apps and virtual reality goggles.

David Helgason, Unity's CEO, said his team has been working on initiatives such as advertising and video-replay technology as well, helping developers both earn money from their apps and help users send gameplay clips to their friends. Unity also manages an app store of its own, helping developers sell artwork to one another to make it easier to build game worlds. So far, Helgason said, he estimates customers have saved $1.4 billion worth of work.

Unity has also been extending partnerships with major device makers in recent years. Today, Unity has agreements with Nintendo, Sony, and Microsoft to ensure developers creating apps for their devices can use Unity for free.

Helgason spoke with CNET about his those efforts, as well as what's coming up for the game technology maker. The following is an edited Q&A:

Q: You've become one of the standards of the mobile and game industries. What are the places you want to see Unity get to?

Helgason: The way we frame it is that there are these two big challenges for developers: Create a great game, and then connect that game with an audience. For the longest part of Unity's history, we've gotten really good at helping you create the game...Now we're addressing the question of how you monetize, how you connect, how do gamers find out about your game.

You set a lot of these console agreements in the past couple of years. How widely has your technology been adopted?

We heard some data that a lot of games are built on Unity, but I don't have anything to quantify it yet... But there are some magical things happening with Unity supporting the consoles so well.

There's this team called Colorblind making a game called Aztez and it's a two-person studio, and they're pretty experienced, but they're two people targeting eight platforms including console. Doing eight different platforms would not even be something a 20-person studio could do. And they're acting like they're 20 or 30 people now. They're fantastically sharp, but they're also using Unity.

A lot of games built for virtual reality technology like Oculus are using your company's software. What do you think of these upcoming VR devices?

I'm a huge fan of VR. Ever since Brendan Iribe

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