What is the primary benefit of the 3DM format over STL or OBJ?

STL and OBJ represent 3D models as a collection of flat triangles (tessellated mesh), which introduces approximation errors. 3DM represents models using exact mathematical NURBS equations, providing infinite resolution and absolute precision, which is critical for industrial manufacturing and marine design.

Is the 3DM format open and accessible?

Yes. McNeil & Associates maintains the openNURBS toolkit, a free, open-source C++ and .NET software library that enables any software developer to read and write 3DM files natively without requiring Rhinoceros licenses.

Can I view a 3DM file without Rhino?

Absolutely. Many general CAD programs, standalone viewers (such as eDrawings or openNURBS-based viewers), and web-based portfolio platforms can view and inspect 3DM models without any active Rhino installation.

3D Solid & B-Rep Standard6 verified tools

Software That Opens & Edits 3DM Files (6 Tools, 2026)

The 3DM format is the native file type of Rhinoceros 3D, the industry standard for NURBS-based mathematical 3D modeling, industrial design, and computational architecture. Because 3DM files store precise double-precision NURBS curves, surfaces, and solids, they maintain perfect geometric fidelity without the mesh tessellation loss of formats like STL. The format is open-source (via the openNURBS initiative), allowing a wide variety of CAD, rendering, and rapid prototyping tools to import and export Rhino models directly. Below are all the tools in our catalog that support the 3DM format.

Full read & write support (2)

R3
Rhino 3DRead & Write
from $995 · Windows / macOS · ★ 4.9
The industry standard for complex NURBS modeling and computational design.
C
CorelCADRead & Write
from $499 · Windows / macOS · ★ 3.6
Affordable DWG-compatible CAD software offering 2D drafting and 3D design tools for professionals on Windows and macOS.

Read-only / viewers (3)

R
RevitRead Only
from $355 · Windows · ★ 4.9
The de-facto standard for Building Information Modeling (BIM).
A
AutoCADRead Only
from $255 · Windows / macOS / Web / Android / iOS · ★ 4.8
The global industrial standard for 2D drafting and 3D modeling.
F3
Fusion 360Read Only
from $85 · Windows / macOS / Android / iOS · ★ 4.8
The cloud-native powerhouse for integrated CAD, CAM, and CAE.

Write / export (1)

A
ArchiCADWrite Only
from $1800 · Windows / macOS · ★ 4.8
The BIM software of choice for design-oriented architects.

Rhino 3DM Double-Precision NURBS Standards

Standard 1NURBS Spline Resolution: Rhino 3DM stores precise mathematical NURBS parameters, enabling infinite resolution zoom and manufacturing-ready surface curvatures.

Standard 2Embedded Mesh Cache: 3DM files cache custom viewport meshes to speed up drawing. Modify render settings to control local file size without affecting solid precision.

Standard 3OpenNURBS Integration: Because McNeel provides the openNURBS library freely, third-party CAM and rendering tools can pull precise mathematical geometry without file translation.

Frequently asked

What is the primary benefit of the 3DM format over STL or OBJ?: STL and OBJ represent 3D models as a collection of flat triangles (tessellated mesh), which introduces approximation errors. 3DM represents models using exact mathematical NURBS equations, providing infinite resolution and absolute precision, which is critical for industrial manufacturing and marine design.
Is the 3DM format open and accessible?: Yes. McNeil & Associates maintains the openNURBS toolkit, a free, open-source C++ and .NET software library that enables any software developer to read and write 3DM files natively without requiring Rhinoceros licenses.
Can I view a 3DM file without Rhino?: Absolutely. Many general CAD programs, standalone viewers (such as eDrawings or openNURBS-based viewers), and web-based portfolio platforms can view and inspect 3DM models without any active Rhino installation.

Need a specific conversion?

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