https://www.thegnomonworkshop.com/tutorials/efficient-techniques-for-building-3d-environments/

Learn a variety of efficient industry-proven techniques for creating a range of 3D environment styles in this 3-hour workshop by James A.J. Miller, Environment Artist at DreamWorks Animation.  The workshop begins with a demonstration of a large 3D city environment in a desert setting. This type of scene offers a great opportunity for James to cover the importance of Triplanar materials, take a look at Houdini's Terrain tools, look at modeling to shot requirements, as well as scattering in Clarisse. This then sets things up perfectly to lead into AOVs in Nuke, where James dives into an explanation about what they are, and how artists can use them to their advantage. He demonstrates how to install Gizmos as well as his best practices for when to use AOVs in Nuke before returning back to a shot and finishing off a composite.  The proceeding section takes a break from shot work to introduce the topic of photogrammetry in 3D environment building, and how to use it effectively. This demonstration walks through an environment scan using Agisoft Metashape.  Up next, James opens up SpeedTree to walk through his “Mothertree” shot, which makes use of the new SpeedTree for Clarisse plug-in. He additionally animates atmosphere using Houdini, which can be taken back into the scene in Clarisse for added impact and realism.