How to convert STEP to PLY
- Add your .STEP file - drop it in the box above or click to browse.
- Convert it to .PLY in a few seconds.
- Download your new .PLY file.
What to expect
- Exact B-rep surfaces are converted to a fixed triangle mesh; curved faces become facets and cannot be re-derived as exact geometry.
- Assembly structure, feature history, and CAD metadata are not carried into PLY.
- PLY comes in ASCII and binary variants; either way it holds only vertices/faces plus optional colour and normals, not solid bodies.
Frequently asked questions
Will a STEP to PLY conversion keep the exact CAD geometry?
No. STEP stores exact boundary-representation solids with true curved surfaces, while PLY is a triangle mesh of vertices and faces. The conversion tessellates the geometry, so curves become flat facets at a fixed resolution and cannot be turned back into exact surfaces.
Why convert STEP to PLY?
PLY is a simple, widely-read mesh format used by tools like MeshLab and Blender and in scanning/point-cloud workflows. Converting lets you visualize or process the model in mesh-based software that cannot open STEP's parametric solids.
Where can I open the resulting PLY file?
PLY opens for free in MeshLab or Blender on any platform, and in many web-based 3D viewers. It reads as plain geometry (vertices and faces), unlike the CAD data in the original STEP.
What information is lost going from STEP to PLY?
CAD-specific data does not survive: assembly structure, exact surfaces, parametric/feature history, and units precision beyond the mesh are dropped. You are left with raw triangulated geometry (optionally colour and normals, which PLY supports).
Programs that convert STEP: AutoCAD · PolyTrans|CAD+DCC · Autoconverter · Afanche 3D Viewer for Mac · AutoCAD for Mac
