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Mountains & Rivers map jam! v5.46

Rolling Line · Community Announcements · May 07, 2026

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It's about time for another community map making event! This time It's themed around the brand new terrain system update.

While the name is the "Mountains and rivers" jam, this can include all kinds of terrain, like deserts, valleys, oceans, beaches, canyons, etc. The only theme requirement is that you make use of the new dynamic in-game terrain sculpting tools.

To submit you map, simply tick the "Mountains & rivers entry" toggle when uploading to the Steam Workshop:

Here is a more detailed list of the rules and requirements:

You can view map submissions in the "Competitions -> Mountains And Rivers" tag on the Steam Workshop:

I also previously posted a developer commentary video about the new terrain system on my Patreon. As with all my devlog videos, I upload them to YouTube as well after a few weeks, so you can watch this video now YouTube here:

[dynamiclink href="https://youtu.be/3vifZad6shY?si=Xgk5h_d0XYlr3kej"]

You can join the Patreon to view these devlog videos early and help support me to keep making free updates!

Other fixes & features

As well as announcing this map jam event, this update also includes a few fixes & features:

Custom fog color effect for tunnel regions

You can now change the color used for tunnel regions. By default they will use the sun color, but you can instead use a custom color to create effects like pitch darkness (black) or underwater (blue) as well as lots of other creative ideas:

Terrain color picker improvements

The terrain painting tool color select has been improved to include a few new features, like it can now select colors directly from a poster. This is amazingly useful when using a reference image for your map:

Remember you can also press Enter when pointing at any editable object to spawn a copy of its color in your hand. You can use this feature to copy the color of a prop, copy a color from a poster (where you are pointing) or copy the color used on a segment of terrain:

Various fixes to the terrain system

Using the arrows to extend terrain in a direction now has improved smoothing. E.g. extending an underwater segment will correctly maintain the water level:

Edges of the table now also correctly display when you use the vertex move tool to shift a vertex around. The walls of the table will now correctly connect to the new position of the vertex:

Additional minor fixes:

And that's everything for this update!

I hope you all have fun for this map making event. Remember I always personally play every single one of the entries for these map events, so no entries ever get ignored.

Whether you're an experienced map maker, or brand new to the game, I highly recommend giving this event a go and making an entry!

Thank you to all my Patreon supporters!

Current Patreons:

Ilike Tra1nZ, DOLLIN, Taerom, Chloe Surett, Garst, Gustavo Sanchez, Gazzac100, Matthew Johnson, Teapop311, TrainTiny, Ábris Pataki, Thomas Merolla, Ben Burch, Detroit_, Don Willis, Jack Fruh, Lynk_Wyland, Nathan Perez, TrainMann, Outertoaster, KathalLasagna, Richard Prior, Michelle chan, Joblogh, Railraider, The_President, Matt, Trainiac 21, ItzAerozic, Microcosmologist, CAMOGUY54321, Jayton Hawkins, Jonathan Ginsburg, TheAmazingRyry, Rowan Mackenzie, Skilker, Blake Prevett, Helga Nordgren, HuskyDynamics, Clae, SmokeStream

Past Patreons:

Codebag Playz, Ethan Lamont, Rivet, Simon, Joey Drysdale, JohnR, Leto Gloas, Lutz, Carter Shew, Trackmeister, NESecretWeapon

You can join the Patreon to help support me to keep making free updates!

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