Best Practices for Using AeroSimulations' Terrain Mesh Enhancements in Prepar3D

Prepar3D has long been a cornerstone for professional flight simulation, used by pilots, virtual airlines, and training organizations. While the default scenery provides a solid foundation, serious simmers know that terrain detail is where the real immersion begins. AeroSimulations’ terrain mesh enhancements offer a dramatic leap in elevation accuracy, coastline definition, and overall visual fidelity. This guide walks through installation, configuration, optimization, and advanced techniques to get the most out of these products without sacrificing performance.

Understanding Terrain Mesh and Why It Matters

Terrain mesh defines the three-dimensional shape of the ground beneath your aircraft. Default Prepar3D mesh uses relatively coarse resolution—typically 76-meter or 38-meter post spacing—which can make mountains look blocky and coastlines jagged. AeroSimulations’ mesh products provide resolutions as fine as 19 meters (LOD19) or even 9 meters (LOD20), capturing real-world elevation data from sources like SRTM and ASTER. The result: ridges, valleys, cliffs, and shorelines appear with stunning accuracy, making low-level flights and approaches feel far more realistic.

This enhancement is especially noticeable in mountainous regions, around fjords, and near complex coastlines. It also improves the behavior of VFR navigation, because terrain features align better with real-world charts.

Choosing the Right AeroSimulations Product

AeroSimulations offers region-specific and global mesh products. The Global Terrain Mesh covers the entire planet at a consistent resolution, while regional packs (e.g., Pacific Northwest, Alps, New Zealand) often include even higher detail. For Prepar3D v4 and v5, verify the product is labeled as compatible—some older FSX-era meshes may cause elevation mismatches. Check the official AeroSimulations product page for the latest compatibility list.

Global vs. Regional: Which to Choose?

  • Global mesh is ideal if you fly all over the world. It replaces default mesh everywhere, but may not reach the same level of detail as region-specific packs.
  • Regional mesh offers the highest detail for specific areas. Use it if you concentrate on certain regions. Regional packs can also be layered on top of global mesh, but watch for overlapping boundaries.

If you install both, make sure the regional mesh has priority in the scenery library so it takes precedence over the global version for those coordinates.

Best Practices for Installation

Proper installation prevents CTDs, missing terrain, and ugly seams. Follow these steps meticulously:

  1. Back up your current scenery.cfg and any custom mesh entries. Use the SceneryConfigEditor tool (free, available from the Prepar3D community) to create a backup.
  2. Run AeroSimulations’ installer as Administrator. Right-click the executable and select “Run as Administrator” to ensure it can write to the Prepar3D Add-Ons folder or the core scenery directory.
  3. Choose the correct installation path. Typically, you’ll want to install into a dedicated library folder outside the Prepar3D root (e.g., D:\Prepar3D Add-ons\AeroSimulations\TerrainMesh). This keeps the simulator folder lean and makes management easier.
  4. Add the new entry to the Scenery Library. After installation, open Prepar3D, go to Options → Scenery Library, click “Add Area,” and browse to the installed mesh folder. Select the folder that contains subfolders like Texture and Scenery. Set the priority level: mesh should sit below all landclass and vector files but above other terrain mesh entries. A common rule: mesh resolves from highest priority downward—the last entry that covers a tile wins. So place your AeroSimulations mesh near the bottom of the library (lowest number in the list) if you want it to override default mesh.
  5. Activate the entry and restart Prepar3D. The scenery library change requires a restart to take effect. When you return, check that the terrain loads correctly by flying to a known location with distinctive features (e.g., Mount Rainier, the Florida Keys).

Handling Multiple Mesh Products

If you use mesh from different developers (e.g., AeroSimulations, FreeMeshX, or OrbX), order them carefully. AeroSimulations recommends placing its mesh at priority 5-10 in the scenery library, while default mesh occupies much higher numbers. Use the scenery.cfg layer numbering system: lower numbers = higher priority. So if your default mesh is at layer 100, place AeroSimulations at layer 99 or below. Avoid duplicate coverage: overlapping meshes with the same resolution can cause micro-seams.

Configuration and Optimization Tips

High-resolution mesh taxes your CPU and GPU. Fine-tune these Prepar3D settings to keep framerates smooth while preserving detail.

Scenery Complexity Slider

Set this to Dense or Very Dense for normal use. Setting it to “Extremely Dense” often shows only marginal mesh improvement while heavily loading the terrain engine. If you have a mid-range system, keep it at “Dense” and rely on the mesh itself for the extra detail.

Mesh Resolution Slider

This slider controls the LOD (level of detail) at which mesh is drawn. For AeroSimulations 19m mesh, set it to 5 m or 1 m. This tells the simulator to use the highest available mesh data. If performance suffers, increase to 10 m—you still gain noticeable improvement over default.

Texture Resolution

Mesh is only half the story; high-resolution terrain textures (like photorealistic or landclass) complement the mesh. Set terrain texture size to 1024 or 2048 if your GPU VRAM allows. For 4K textures on a 8GB+ GPU, go to 4096.

Disable Conflicting Add-Ons

Some add-ons, especially those that modify elevation data (e.g., certain AI traffic packages with ground altitudes, or older default airport files with flatten polygons), can interfere with AeroSimulations mesh. Use tools like ADEXplorer to identify airport altitude sliders that might be flattening an area. You can either remove those files or note that some airports may appear “sunken” or “floating” if the mesh and airport altimeter disagree.

Graphics Driver Optimization

Ensure you are using a recent GPU driver from NVIDIA or AMD. In the GPU control panel, set Prepar3D to “Prefer Maximum Performance” mode and disable vsync (use the simulator’s internal frame limiter instead). Turning off anisotropic filtering in the driver and letting Prepar3D handle it often gives better results.

Achieving Maximum Realism: Combining Mesh with Other Scenery

AeroSimulations mesh works synergistically with landclass, vector data, and autogen. Follow these strategies for a world-class environment:

Pair with High-Quality Landclass

Landclass defines what types of ground cover appear (forests, fields, cities, deserts). Combining AeroSimulations mesh with a product like OrbX Global LandClass (or free alternatives like FreeMeshX landclass add-on) ensures that hills are covered with appropriate vegetation and that shorelines align with landclass transitions.

Use Vector Data for Coastlines and Rivers

Mesh products enhance elevation, but vector data sharpens coastlines and water bodies. Install OrbX Vector or Prepar3D v5’s default vector updates. Note that vector data can sometimes conflict with mesh if they don’t share the same source—AeroSimulations mesh is designed to work with most third-party vectors, but test in a known location first.

Apply Photorealistic Scenery Selectively

Photorealistic scenery (e.g., from Orbx, Simhaven, or Aerosoft) uses actual aerial imagery draped over the mesh. This combination delivers the ultimate realism. Ensure that the photo scenery is installed on top of the mesh (higher priority in the scenery library) and that the mesh is exactly aligned. AeroSimulations mesh is often used as the underlying elevation for many photoreal add-ons.

Advanced Troubleshooting and Common Issues

Even with careful setup, issues can arise. Here are solutions to frequent problems:

Sunken or Floating Airports

If the airport surface appears below or above the surrounding mesh, you likely have a conflicting flatten altitude. Most airports have an APX file that sets an elevation. If that elevation is slightly off from the mesh, you’ll see a visible step. Use Airport Design Editor (ADE) to view the airport altitude and adjust it (or apply a small flatten polygon). Alternatively, disable the airport’s elevation file if the mesh already provides the correct height.

Seams or Cuts in Terrain

Visible lines across the landscape indicate that overlapping mesh files don’t align perfectly. Ensure you are not using two different mesh products that cover the same area. If you have both a global and a regional AeroSimulations pack, verify the regional is installed in a separate folder and set to a higher priority (lower layer number). Also check that your mesh LOD is consistent—switching between 19m and 5m sliders mid-flight can cause temporary seams.

Performance Drops in Certain Areas

If frame rates plunge near detailed terrain, reduce the sliders as described earlier. You can also lower the autogen density—trees and buildings are more demanding than mesh. For extreme cases, disable terrain shadows in the lighting settings; these shadows recalculate constantly over mesh triangles.

Missing Coastlines or Inland Water Bodies

If water appears as flat land or missing, your landclass and vector files may not be installed correctly. AeroSimulations mesh does not include water—it only defines the bare earth elevation. Ensure you have a water masking add-on (like default Prepar3D water or OrbX Vector).

Staying Up to Date and Leveraging the Community

AeroSimulations occasionally releases updates to their mesh packs, incorporating newer DEM data or fixing bugs. Check the official website and your account downloads every few months. The AVSIM Prepar3D forum and the official Prepar3D community forum contain dedicated threads where users share performance tweaks and find fixes for specific regions.

Consider using tools like TerrainMeshInspector (free utility) to visualize your mesh coverage and detect gaps. Many users also post comparison screenshots to help you choose the right product.

Conclusion

AeroSimulations' terrain mesh enhancements can transform your Prepar3D experience from good to breathtaking. By following proper installation, careful configuration, and intelligent layering with other scenery products, you gain elevation detail that makes every mountain pass and island approach feel real. Balance visual fidelity with your hardware limits using the sliders described, and don’t underestimate the importance of ordering your scenery library correctly. With these best practices, you’ll fly over a world that looks and performs exactly as you need—whether training for real-world flights or simply enjoying the virtual skies.