Step 4 - Running the Rule Processor GenerationĪll the data needed to start generating your city has been imported into the engine and you have a map with which to load and save it. You now have a level that you can use to generate and build your city. For example, this guide uses M圜ity as the level name. Save the map in the Content > Maps (2) folder and enter the Name (3) of your city into the text field. Once the new level has been created, use the File menu to Save Current Level As (1). Choose City Open World Empty (2) from the available templates and click Create (3). Using the File menu, select New Level (1). This template level provides a starting point for creating your own city like the one from City Sample, with its own lighting and skybox set up and Blueprint spawners used to populate data. In this step, you will create a new level from a templated City Open World level. These assets are used in the steps that follow to start generating your city. For example, the cities included with the City Sample project can take less than 10 minutes for the Small_City to import and upwards of 40 minutes for the Big_City to import.Īt this point, you should see all your geometry and point cloud data files have been imported and saved as assets in the folders you created in Step 1 of this guide. The import process can take some time depending on the size of your city. This video has been sped up to show the full import process of a smaller city created in Houdini being imported. Select all the files in the PBC folder in Windows and drag them to the PBC folder in Unreal Engine. In Unreal Engine, use the Content Browser to open the City > M圜ity > PBC folder. Inside the Windows M圜ity folder, open the PBC folder. In the first part of the Quick Start Guide for Generating a City and Freeway using Houdini, you set the folder path as D:/CitySampleSource/M圜ity. In Windows, open the file location where you saved your Houdini city data. With your own city's folders created and a Houdini Engine session started in the previous step, you can now import your data into Unreal Engine 5. Step 2 - Importing the City Data into Unreal Engine 5 You have a new folder named for your city, and two folders within it named Geometry and PBC. If a session cannot be created, check the Output Log for additional context as to why it failed to do so.Īt this point, you have opened the City Sample project and created folder locations to import the data you generated in Houdini for your own city. From the main menu, open the Houdini Engine dropdown menu and select Create Session. The City Sample project includes the Houdini Engine Plugin, which is already enabled. Open your named city folder and create two new folders named Geometry and PBC. Therefore, name the folder you create in the Content Browser M圜ity. For example, the sample Houdini city file you created in Part 1 was named "M圜ity". In the Content Browser under the Content > City, create a folder with the exact same name as the city you created in Houdini. Open the City Sample project with Unreal Engine 5. This guide also assumes you have knowledge of Windows operating systems when using something like Command Prompt.īefore you can use your own city's data you generated while following the City Sample: Generating a City and Freeway using Houdini guide, you'll first need to open and set up a few things in Unreal Engine 5. While Unreal Engine and Houdini support Mac and Linux, the workflows and source files have not been tested with those systems and we cannot guarantee they will work as intended. The workflow and files used in this guide work with the Windows 10 operating system. Refer to the City Sample Recommended System Specifications.ĭownload the City Sample Unreal Engine 5 project through the Epic Games Launcher. For bigger cities, you can expect to use from 5 to 10 GB of space. We recommend using version 18.5.532 since it's the version that was used to develop the City Sample project.Īt least 2 gigabytes (GB) of free hard disk space to extract the data and generate small-sized cities. Generate Hierarchical Level of Detail meshes for World Partition.Ĭompletion of City Sample - Generating a City and Freeway using Houdini Use the point cloud data with Zone Graph for Traffic simulation. Use the Rule Processor to import Houdini procedural data to generate your city. Prepare an open world environment to support your city. Import data you generated from Houdini Engine into Unreal Engine 5. To complete this part of the guide, you must have first followed City Sample - Generating a City and Freeway using Houdini.
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