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What we’re doing is a very simplified version of this concept. So the automobile industry has been using that idea for years – since the 1970s or something – to simulate car crashes, so that they don’t have to crash a real car. The bonus of that is if you crash something like that against a wall, it will behave correctly.

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So, we don’t have any specific code in there for trucks or for cars, except for the wheel acceleration. And when you start driving, it behaves like a truck. And when it all comes together, you put on wheels – that are in the shape of a wheel. It’s more like you design a skeleton in the shape of a truck.

So, when you design a truck, it’s not like you start designing a truck. Nodes are the mass points, and beams are the connections between. Instead of doing rigid bodies, like – a car is a box – we do node/beams. Thomas: The crash physics is something that evolves from the way we’re doing physics. There are lots of those, and, again, there, the level of detail is really impressive. Rich: I also spent some time this morning watching car crash videos on YouTube.

This is why they give so much detail into creating the models.

They love the amount of detail the physics gives them. People really like to do that stuff and simulate how it would behave in real life. So you can tune your car or your truck or your vehicle to the last bit you would like to.

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But if you learn how to do it, Rigs of Rods can give you simulation details that not many other simulators can give you. We have currently 43,000 members in the forums.

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Thomas: All of the content that you can download – I think we have thousands of modifications for the game online – and all of those modifications are made by the community. Do those come from the community, or are those all developed by the core team? Rich: I was playing the game this morning, and I was impressed by how many vehicles there were, and the incredible level of detail of the individual vehicles. And so it evolved, and it got quite a community around it, and I joined the project in 2007. He thought he could do a better job then they were doing, and he started out with the idea, with the node/beam physics. He had the idea of doing physics in games differently than it used to be in games. Pierre-Michel is the original author of that software. Thomas: The game itself started in 2005, I think. Rich: Tell me a bit about the history of the game. We describe how mass points behave, and interaction between those mass points. We describe not how a car should behave, or how a box should behave. What we’re doing with soft body physics is we go one level deeper. This is usually the way that rigid body physics works. Like, you describe a car as a box with four wheels attached to it. Rigid body physics is an abstraction of an object of how it should behave, in a bigger approach. One side is rigid body physics, and one side is soft body physics. Thomas: There are two principle concepts on how physics work in games or simulations. Rich: How would you describe the concept of “soft body physics” to somebody that’s not familiar with it? What does that mean? You can subscribe to this, and future podcasts, in iTunes or elsewhere, at, and it’s also listed in the iTunes store. If the embedded audio player below doesn’t work for you, you can download the audio in mp3 or ogg formats. If you’d like to have your project featured on the SourceForge podcast, just drop me a note and we’ll schedule something. If you want to work on this project, join the conversation in the Rigs of Rods forum. I recently spoke with Thomas, who is one of the Rigs of Rods developers, and he explained a little bit to me about how all of this works, as well as how you can get involved in this project. Rigs of Rods is a soft body physics simulator, in which you can build vehicles, and drive them around, and crash them into each other, all in very realistic ways. SourceForge is proud to introduce our November Project of the Month, Rigs of Rods.

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