Free online PLY to SCAD converter

PLY files commonly come from scanners and mesh-editing software, while OpenSCAD requires script-based .scad files. Converting the mesh lets you place scanned or modeled geometry in an OpenSCAD project, although the result is usually a mesh reference rather than editable OpenSCAD geometry.

What the PLY format is

PLY, or Polygon File Format, stores polygon meshes made from vertices and faces. A file can also contain vertex colors, normals, texture coordinates, and other properties. PLY is common in 3D scanning, photogrammetry, research datasets, and mesh-processing applications.

Blender, MeshLab, CloudCompare, 3D scanners, and many academic or computer-vision tools can create or export PLY files. PLY may be ASCII or binary, and binary files can use little-endian or big-endian encoding.

What the SCAD format is

SCAD is the script format used by OpenSCAD. It describes objects with commands such as cube(), cylinder(), union(), and difference(), and it can also load external meshes with import().

SCAD is useful for parametric models, repeatable dimensions, boolean operations, and version-controlled designs. A converted scanned mesh does not become a collection of editable primitives; it remains polygonal geometry referenced by the script.

How to convert PLY to SCAD

Using 101convert

You can convert the file on the 101convert.com website for free without installing software. Upload the PLY file, choose SCAD as the output format if available, start the conversion, and download the generated .scad file. Open the result in OpenSCAD and render it with Design → Render (F6).

Using MeshLab and OpenSCAD

1. Open the PLY in MeshLab with File → Import Mesh.
2. Check the mesh for holes, duplicate vertices, inverted faces, and excessive noise. MeshLab filters such as Filters → Cleaning and Repairing can remove some defects.
3. Export an intermediate STL file with File → Export Mesh As, using a filename such as model.stl. STL preserves triangle geometry but normally discards PLY colors, textures, and custom vertex properties.
4. Create a file named model.scad in the same directory with this content:

import("model.stl", convexity=10);

5. Open model.scad in OpenSCAD. Use Design → Preview (F5) for a quick check or Design → Render (F6) for a final mesh evaluation.
6. To create a final STL from OpenSCAD, use File → Export → Export as STL. The SCAD file and model.stl must remain together because the script contains a relative file reference.

The wrapper method is usually preferable to embedding every triangle in a polyhedron() statement. A direct mesh-to-polyhedron() conversion is possible with a custom PLY parser or a mesh-export script, but large scans can produce very large, slow SCAD source files.

Quality and compatibility limitations

PLY has no universal unit declaration. Confirm whether the source coordinates represent millimeters, centimeters, or meters; use an OpenSCAD scale factor when necessary, for example scale([1000,1000,1000]) import("model.stl");.

OpenSCAD requires a usable closed mesh for reliable boolean operations. Non-manifold edges, self-intersections, zero-area triangles, holes, and inconsistent face orientation can cause rendering errors or incorrect differences. Repair the mesh before export when the object will be used in boolean modeling.

Colors, textures, scan metadata, and most PLY-specific attributes are lost during STL conversion. The imported object also remains a fixed triangle mesh, so changing its dimensions does not regenerate the original scan or expose parametric features. High-resolution scans may make OpenSCAD preview and rendering slow; decimate the mesh in MeshLab before conversion when detail beyond the intended manufacturing resolution is unnecessary.