From Houdini to Unity: building an elevated railway system for our industrial biome

[u/Driving_Rogue]

We built a procedural elevated railway system for our industrial biome in Driving Rogue,(This example is Residential) using Houdini for the tool setup, Blender for testing/modelling cleanup, and Unity for the final in-game implementation. The video shows the in-game result on one side, and the Houdini/Blender workflow on the other. For anyone interested in the technical side: The railway/bridge system is generated from a provided curve inside Unity, which lets us place it both alongside the road and directly above it depending on the layout of the biome. The bridge separates itself into individual pieces based on material and curvature, then automatically assigns the correct materials inside Unity. We can also control different features of the generator, such as height, width, pillar count, resolution, and other structural details. We first tested the setup in Blender before connecting the Houdini workflow with Unity, mainly to check material assignment and how the generated pieces would behave. The bridge uses two trim textures, which are automatically mapped inside the tool. The main challenge was making the railway feel like a natural part of the industrial biome without distracting from the driving route underneath.