http://www.thegnomonworkshop.com/tutorials/creating-a-swamp-scene-for-games-with-speedtree-photogrammetry

Join Adrien Paguet-Brunella, Senior Environment Artist, as he takes you on a comprehensive journey through the complete process of creating assets for a game environment biome collection. In this step-by-step workshop, you'll gain valuable insights into using SpeedTree, Blender, and Photogrammetry techniques to bring your natural environments to life.  Designed for intermediate-to-advanced artists with prior knowledge of SpeedTree, Blender, and Unreal Engine, this workshop provides a complete overview of asset creation. Using photogrammetry and photometric stereo captures, Adrien dives into meticulously creating high-resolution leaves, branches, and flowers, ensuring every detail is carefully crafted.  Adrien demonstrates how to create a hero tree, which serves as a blueprint for creating variations of trees. You'll also learn how to process scanned grounds and rocks and how to transform them into tileable landscape materials, along with some general photogrammetry tips.  In addition to asset creation, Adrien shares valuable AAA production tips for building collections for natural environments. To conclude the workshop, he demonstrates how to seamlessly weave together all the assets created, resulting in an immersive and realistic scene plus dioramas.