Convert RAD to CGM

Understanding RAD and CGM file formats

RAD files are typically associated with Radiance, a suite of programs for the analysis and visualization of lighting in design. RAD files contain scene descriptions, including geometry, materials, and lighting information, used for photorealistic rendering and lighting simulations.

CGM (Computer Graphics Metafile) is a standardized vector graphics format used for 2D graphics. It is widely used in technical illustration, engineering, and aviation industries due to its scalability and support for both vector and raster graphics.

Why convert RAD to CGM?

Converting a RAD file to CGM format allows you to use lighting simulation results or scene geometry in technical documentation, CAD systems, or other applications that require scalable vector graphics.

How to convert RAD to CGM

There is no direct, one-step converter from RAD to CGM due to the specialized nature of both formats. However, you can achieve the conversion through an intermediate step:

1. Export geometry from RAD: Use Radiance tools (such as obj2rad or rad2mgf) to export the scene geometry to a more common 3D format like OBJ or MGF.
2. Convert to a vector format: Import the intermediate file (e.g., OBJ) into a 3D modeling or CAD software that supports vector export, such as Autodesk AutoCAD or Blender (with plugins).
3. Export as CGM: In your CAD or illustration software, use the export function (File → Export → CGM) to save the scene as a CGM file.

Recommended software for conversion

• Radiance: For exporting or converting RAD files to intermediate formats.
• Autodesk AutoCAD: Supports importing 3D geometry and exporting to CGM.
• CorelDRAW: Can import various vector formats and export to CGM.
• Okino PolyTrans: A professional 3D data translation tool that can help bridge between formats.

Tips for successful conversion

• Ensure that the geometry and details you need are preserved during each conversion step.
• Check the CGM output for accuracy, as some details or lighting effects may not translate directly.
• Consider simplifying the scene if only vector outlines are needed in the CGM file.