CAD Export Formats Explained

When drone imagery is converted into precise 3D models, choosing the right export format is critical — because each format has its strengths and weaknesses. CAD software, surveyors, architects, and engineering firms work with different file formats depending on the application and software environment.

The core formats are: DXF and DWG for 2D drawings and 3D vector data (primarily in AutoCAD workflows), LAS and LAZ for point clouds with millions of individual 3D points (ideal for topographic surveys), and OBJ and PLY for complete 3D surface models (meshes) with textures.

This guide explains when to use which format, what software supports it, and how Voxelia converts your drone data into the right formats — quickly, accurately, and without data loss.

The following table shows the key properties of each format and helps you quickly identify the right format for your workflow. File size, software compatibility, and use case are particularly important.

DXF (Drawing Exchange Format) and DWG (Drawing) are the two most popular formats for CAD data, but there are important differences. DXF is an open, text-based format that nearly all CAD programs can read. DWG is Autodesk's proprietary format and is only fully supported in AutoCAD and licensed converters.

In practice, this means: if you're working with architects or engineers using AutoCAD, DWG is often the standard. But if you work with different software (Revit, Vectorworks, SketchUp, QGIS, ArchiCAD), you should choose DXF — it works everywhere.

File size-wise, both formats are similarly compressed. The difference lies in compatibility and the ability to support new features. DWG is constantly expanded by Autodesk, while DXF is standardized more slowly. For photogrammetry from drone images, this difference is negligible — you get a high-quality 2D vector model and 3D vector geometry in both formats.

A point cloud is a format that stores millions of individual 3D points — each point has an X, Y, Z coordinate and often additional RGB color information. The LAS format (ASPRS standard) is the international standard for aerial surveying, LiDAR data, and drone photogrammetry.

LAS files can become very large (50-1000 MB per project, depending on image resolution and project size). That's why LAZ exists, the compressed variant of LAS — up to 10x smaller without quality loss. LAZ is ideal for storage and uploading to cloud platforms.

Point clouds are particularly important for topography projects, GIS analysis, and detailed surveys. With CloudCompare or QGIS, you can visualize the point cloud, measure distances, and derive digital elevation models. Revit supports LAS files as reference clouds, which is essential for building placement.

While point clouds consist of individual points, a mesh is a true 3D surface model — made of triangles (faces) that form a continuous surface. OBJ and PLY are the two most important mesh formats.

OBJ is the most universal format and is supported by virtually every 3D software — Blender, Maya, SketchUp, Revit (with plugins). An OBJ file can contain millions of triangles and optionally be combined with textures (MTL files). This is ideal for 3D visualization, rendering, and VR/AR applications.

PLY (Polygon File Format) is similar to OBJ but stores RGB color information directly in the file — this is valuable for colored, photorealistic 3D models. CloudCompare and Meshlab are specialized tools for PLY editing, and many visualization platforms support PLY directly.

For drone photogrammetry, Agisoft Metashape and Pix4D standardly produce OBJ and PLY files with high-resolution textures. These files are high-quality enough for presentations, marketing materials, and even streaming on web platforms (e.g., Sketchfab).

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The choice of format often depends on the software your team or customers use. Here's an overview of the most important programs:

AutoCAD: Native DWG and DXF support. LAS files can be imported as Point Clouds. Revit (BIM): DWG and DXF as references, LAS as Point Cloud Reference, OBJ as imported (often requires plugins for complex scenes). ArchiCAD, Vectorworks, and SketchUp: DXF and OBJ well supported, DWG with plugins. QGIS and ArcGIS (GIS software): LAS and LAZ optimal, DXF and Shapefiles as 2D vector. CloudCompare and Meshlab: Specialized software for point clouds (LAS, PLY) and meshes — free and highly professional.

If you're unsure which formats your customers need, it's safe to deliver multiple formats. Voxelia delivers DXF, LAS, and OBJ by default — so everyone is covered.

Voxelia processes your drone images fully automatically into all common CAD export formats. After image capture, the workflow follows: image alignment (SfM), dense point calculation, mesh reconstruction, and then parallel export to DXF, DWG, LAS, LAZ, OBJ, and PLY — all at no extra cost.

Delivery is standard within 24 hours of image receipt. For larger projects (> 500 MP total image data), plan for 2-3 days. All data is georeferenced (with real coordinates) and ready to use directly in your workflows — no manual post-processing needed.

Voxelia guarantees 1-3 cm horizontal accuracy with RTK drones, which is sufficient for architecture, surveying, and solar projects. The geometry quality is on par with professional photogrammetry software (Agisoft Metashape, Pix4D), but without the long processing time.