djy1989 / mayo

3D CAD viewer and converter based on Qt + OpenCascade

Mayo the opensource 3D CAD viewer and converter

👓 Overview

• Convert 3D files
  Mayo can read/write 3D files from/to STEP, IGES, STL and many other CAD formats

• Visualize 3D files
  Mayo 3D viewer supports clip planes, exploding of assemblies, measurement of shapes, show/hide parts, ...

• Cross platform
  Mayo runs on Windows, Linux and macOS

• Solid foundations
  Mayo is developed in modern C++ with Qt and OpenCascade

⚡ Features

• 3D clip planes with configurable capping

• 3D exploding of the model tree allowing better exploration of complex designs

• 3D measure tools for circles, angles, lengths, areas, ...

• 3D view cube providing intuitive camera manipulation

• Quick access to CAD files recently open thanks to thumbnails in the Home page

• Toggle item visibility within the Model tree(use checkbox)

• Customizable mesh precision for BREP shapes, affecting visualization quality and conversion into mesh formats

• Convert files to multiple CAD formats from command-line interface💻

💾 Supported formats

Format	Import	Export	Notes
STEP	✅	✅	AP203, 214, 242
IGES	✅	✅	v5.3
BREP	✅	✅	OpenCascade format
DXF	✅	❌
OBJ	✅	✅
glTF	✅	✅	1.0, 2.0 and GLB
VRML	❌	✅	v2.0 UTF8
STL	✅	✅	ASCII/binary
AMF	❌	✅	v1.2 Text/ZIP
PLY	✅	✅	ASCII/binary
Image	❌	✅	PNG, JPEG, ...

See also this dedicated wikipage for more details

🔍 3D viewer operations

Operation	Mouse/Keyboard controls
Rotate	mouseLeft + move
Pan	mouseRight + move
Zoom	mouseLeft + mouseRight + move
Zoom +/-	mouseWheel(scroll)
Window zoom	CTRL + mouseLeft + move
Instant zoom	spaceBar
Select Object	mouseLeft click
Select Objects	SHIFT + mouseLeft clicks

Mayo supports also multiple 3D viewer navigation styles to mimic common CAD applications(CATIA, SOLIDWORKS, ...)

🔨 How to build Mayo

Instructions for Windows MSVC
Instructions for Debian
Instructions for macOS

🎬 Gallery