Simulating Hydraulic Erosion | Hacker News Reader

Simulating Hydraulic Erosion

jobtalle.com

54 pointsschnautzi10 comments

Chaim Gingold (one of the developers of Spore) made "Earth: A Primer", a cool interactive educational simulation science book. It's a live earth simulation sandbox that teaches about plate tectonics, volcanos, erosion, hydrology, water cycles, climatology, rain shadows, and other cool stuff, and was inspired by Neil Stephenson's young lady's illustrated primer, but on a somewhat different physical scale:

Earth Primer

https://www.earthprimer.com/

Experimental Gameplay Workshop 2015: Earth Primer

https://www.youtube.com/watch?v=qtsf3nRFfwk

>As part of the Experimental Gameplay Workshop for GDC 2015, Chaim Gingold presents Earth Primer, an app that's a 'science book for playful people.' As the description of the experience from the ex-Spore programmer explains: "Visit volcanoes, glaciers, sand dunes. Play with them, look inside, and see how they work. The forces of nature are at your fingertips."

The 'Sandbox' on the Earth Primer app fosters creativity.

https://www.youtube.com/watch?v=g8lqOj_JMU4

>I took this video of myself fiddling with the differing features of the 'Sandbox' on the Earth Primer app. 'Sandbox' ultimately fosters creativity in students as they create their own, completely unique, landscapes using the technical capabilities that they have developed throughout the initial stages of the app.

Sad that it's Mac only.

That looks so interesting, thanks for sharing!

Chaim's amazing, and Earth Primer is one of his finest pieces of work, inspired by other simulation games like SimCity, SimEarth, and Spore. Check out his Experimental Gameplay Workshop talk and demo -- he shows it in action and tells about how Earth Primer is an example of a genre of educational simulation software that combine telling, showing, and doing. He's currently finishing up a book about the history of SimCity and computer simulations.

https://www.linkedin.com/in/chaim-gingold-aa98bb3/

Chaim Gingold

Projects and clients include Spore, EA/Maxis, Earth: A Primer, Valve, UCSF Medical School, and Linden Lab. My expertise and interests include authoring tools, tangible computing, prototyping, simulation, and play. Design lead for Spore Creature Creator. Freelancing and open to the right longer term fit.

Currently focused on finishing a book for MIT Press on the history of SimCity and computer simulation. I'm doing a little bit of consulting, and will have more bandwidth beginning around mid-2020, when the manuscript should be complete.

Coll simulation! I'm looking for any pointers to noise or other generative methods which looks like eroded terrain from the get-go, without the cost of simulating the erosion process. Any tips appreciated.

There are tricks to do it, I described some at the end of this blog post: https://jobtalle.com/layered_voxel_rendering.html

- If you raise all height values to a power, you get creases in the terrain that are generated by erosion in real life.

- If you raise all terrain values under a height just above sea level to a power, then you get beach like erosion, so flat areas will form along the shore.

I'll admit it, you made me look up "Coll simulation" to figure out what it was. Even though I assumed it was a typo. Which it is.

This is topical - I'm currently working on an uplift/erosion simulation with Unity/C#. I'll be curious to try this algorithm out. I'm using the Microsplat asset to set the terrain splats based on steepness and altitude.

I'm currently using diamond-square to generate the mountains, and it looks good, but my erosion algorithms tended to look off.

There's a fascinating world of compute shaders with Unity that would push this onto the GPU, but I don't know if I'll get that far with this project.

Thanks for sharing!

This specific implementation won't easily work on the GPU, it's mostly the grid based ones that are easy to parallelize. You could even stick to common fragment shaders if you wanted to port that to the GPU.

Diamond square should be good enough for initial terrain, but I'd keep it smooth; let the erosion take care of the details.

If the author's reading, I seem to remember a scientific american article on erosion, though I don't know what kind of erosion (presumably water) or when it was published. FYI.

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