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How? First, the material, such as a planet, is broken into a number of “particles” that each have properties such as mass, temperature, velocity, and position. So in short, SPH will help create more detailed, realistic simulations of collisions, fragmentation, and formation of different types of objects in Universe Sandbox. And even in the case of large chunks of solid rock colliding with each other, there is such intense temperature and pressure that the materials behave more like fluid rather than rigid solids: they’ll stretch and distort and be torn apart, rather than splinter, crack, and shatter. This is also true for planets, whether it’s a gas giant or a rocky planet with, or even without, a molten core. On an astronomical scale, many of the objects you can simulate, like stars and galaxies, behave like fluids.
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That might make you think that we’d use this for simulating something like water flow on a planet’s surface, but “fluid” here actually has more to do with simulating much larger objects. SPH is a computational method commonly used for modeling fluids (though it can also handle solids).
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Or if you’re curious about SPH, but perhaps not curious enough to read 35 pages on it, here’s a crash course: What is SPH and how does it work?įor a deep dive into the mechanics of SPH, check out this paper from our very own physics developer, written back in 2010 (interestingly, not written in relation to Universe Sandbox, but for another project that was similar in many ways - there’s a reason why we hired him many years ago to help build this new version of Universe Sandbox, and it had more to do with relevant experience than it did with his propensity for typos… *wink*). This is a behind-the-scenes look at a feature that we are still working on. SPH is NOT included in Universe Sandbox yet. Introducing… smoothed-particle hydrodynamic fluid simulation. We’re excited to explore its possibilities even more.īut right now, let’s turn our attention to something our physics developer, Alexander, has been working on. Surface Grids is a massive new feature that changes a lot with the core simulation of objects in Universe Sandbox, and so far we’ve just scratched the surface of what it can do. We plan to continue to add to the Surface Grids feature with even more detailed surface simulation through next year and beyond. If you haven’t, time to get out from that rock you’ve been living under and start terraforming all those other rocks floating through space. Hopefully by now you’ve had time to check out Surface Grids & Lasers | Update 24 of Universe Sandbox. Catch a glimpse of it in the trailer at the 0:17 mark!Ĭheck out a full list of What’s New in Update 24.1įollow Simulating a planetary collision using a new method called smoothed-particle hydrodynamics (SPH). A film adaptation of the same name, starring Nicolas Cage and coming to theaters in January 2020, features a scene with a character playing Universe Sandbox. Lovecraft sci-fi short story The Color Out of Space. The name of this update is an homage to the H.P. This update also improves black hole visuals, makes it possible to view Surface Grids data directly on an object’s surface, and adds a bunch of smaller improvements and bug fixes. Graphs are now docked alongside the other view panels added with Surface Grids, making it easy to keep your eye on data for different objects and properties as graphs, maps, and surface views. We aim for realism in Universe Sandbox, but that doesn’t mean we can’t also allow for creativity. Add dozens of bands to gas giants, turn Earth’s atmosphere red, or color your alien star purple. Run Steam to download Update 24.1, or buy Universe Sandbox on Steam where it is 33% off until January 2, 2020.Ĭustomize colors for just about every object in the new Appearance tab. December 20: Update 24.1.1 is a small patch that fixes a handful of bugs, including issues with gas giant band order and lighting for custom star colors.