We’ve seen them before. The pixel-perfect Portal 2 replica, the Iron Man Arc Reactor, the Jedi Lightsaber. With the rise of shared knowledge via the internet, we can finally take a peek into a world hidden behind garage doors, basements, and commandeered coffee tables strewn with nuts, bolts, and other scraps. That world is prop-making. As fab equipment like 3D printers and laser cutters start to spill into the hands of more people, fellow DIY enthusiasts have developed effective workflows and corresponding software tools to lighten their loads. I figured I’d take a brief look at a few software tools that can open the possibilities for folks at home to don the respirator and goggles and start churning out props.
Time spent here with an initial design can form the backbone for part locations throughout the process. [Harrison Krix], the mastermind behind VolpinProps, takes his time with blueprints made in Adobe Illustrator. Don’t want to spend money? No problem. Inkscape and LibreCad land as the open source vector illustration alternative.
Once the initial drawings are done, CAD and 3D-modeling software can flesh out the 3D-details with features that track the original reference.
Get into a 3D Modeling Groove with Blender
In the world of prop-making, replicas take a slightly different approach from traditional engineering CAD and drafting workflows. In many cases, “if it looks right, it is right” is a tight-enough constraint to make believable props, and while CNC machinery might come into play to spin a few parts, you wont need three-decimal-point precision to get a few heads to turn. With this criteria, Blender becomes an excellent choice for making 3D models of our intended parts. Though it supports comprehensive rendering and animation features, we can just take advantage of the excellent mesh-editing tools for 3D modeling.
If you’re looking for a classy node-based 3D modeling alternative, have a go at Antimony.
Ripping Game Files Directly
To make props from 3D video games, why not take inspiration from the original model itself? [Angus Deveson] did just that in his model-ripping tutorial using Milkshape 3D to convert the uncommon game file format into a familiar 3DS or STL format ready for 3D printing. Its worth mentioning that the raw 3D file stored in your video game may be a less-than-sufficient starting point, however. As [Stormleader] on the RPF forums explains, the 3D rendering trick known as “normal-mapping” enables video game developers to combine a low-resolution 3D model with a high-resolution texture that enhances the perceived level of detail without relying on the original high-resolution model.
The net result is that 3D models included in the game start at an inherently low resolution–possibly too low for a detailed replica. Nevertheless a low-res model may be sufficient for a foldable Pepakura (papercraft) model.
Lastly, keep in mind that making profit from models exported from the game is a violation of the game’s terms of service.
With a 3D model made in Blender, our first steps of bringing that model into the real world might arrive in the form of paper. Pepakura, a low-cost 3D-model-unfolding software package does what you’d think. It unfolds a 3D mesh into a flattened vector graphic that we can print, cut, and fold back into a replica of the original model. Once reinforced with fiber-glass or cheesecloth, the structure is durable enough to don at the con without falling apart. The process of cutting, folding, and reinforcing is a long one, but fortunately the cutting step can be drastically expedited with a nearby laser cutter. Since not all workflows are the same, fellow DIY CNC enthusiasts have developed additional software tools, like dxf2gcode for easy file conversion. Finally, if you’re still not interested in shelling out the $38, Blender artists have arrived on-scene to deliver a Blender plugin that will also rip a mesh into a printable 2d file format.
You could take your first few steps into prop-making flying solo, but the reality is that folks around the world are eager to share their techniques and ask for tips. Why not join them? With the community behind you, combined efforts can produce shared designs and replica’s honed with world-wide feedback. Soldiering up for sci-fi duty? Head over to the 405 Infantry forums. Need a general starting place? Try the RPF forums. Here on the forums, props come to life as they’re still progressing through their development stages, such as a collective movement to build Mark Watney’s EVA suit.
When a prop is done right, the lines between what’s real and what lives in our imagination get a little hazier–and that’s a good thing! From the folks here at Hackaday, thanks to all the prop makers who’ve blurred the lines behind what’s real and what lives in our imagination, altogether making the real world just a little bit cooler.