Topic: Open Cascade CAD Assistant is a powerful offline 3D CAD viewer and converter

[Software Santa]

Open Cascade CAD Assistant is a powerful offline 3D CAD viewer and converter for Linux, Windows and Mac systems.

https://www.opencascade.com/products/cad-assistant/

Open Cascade CAD Assistant is a powerful offline 3D CAD viewer and converter with simple and intuitive interface, free for both personal and commercial use. Originally developed as a testbed and showcase for the Open CASCADE Technology on mobile platforms, the solution has been appreciated as fast and handy 3D viewer by thousands of end-users on mobiles and desktops worldwide. CAD Assistant brings the power of open technologies to the hands of engineers working with 3D data.

CAD Assistant is based on open source libraries (Open CASCADE Technology, Qt, FreeType, FreeImage, etc.) and employs open formats for CAD and mesh data (STEP, IFC, IGES, BREP, glTF, JT, PLY, STL, OBJ, 3DM). It also supports a set of other file formats like DXF, SAT (ACIS), XT (Parasolid).

Basic 3D model viewing and converting
Basic functionality is provided by XDE component of
Open CASCADE Technology
(OCCT). The program supports the following file formats:

    STEP (AP203, AP214 and AP242) — ISO 10303 standard for product data representation and exchange among CAD systems (ASCII format). Supported data: shape geometry, assembly structure, colors, names, validation properties, file information, dimensions and tolerances (semantic and tesellated PMI).
    IGES (5.1 and 5.3) — vendor-neutral format for data exchange among CAD systems (ASCII format). Supported data: shape geometry, colors, top-level object names, file information.
    glTF — API-neutral runtime asset delivery format (ASCII or binary), commonly supported by modeling systems and game engines. Supported data: shape geometry (triangulation), assembly structure, PBR metallic-rougness materials with texture maps, names.
    XBF — BinXCAF, which is a binary persistence format for universal XCAF document structure used by OCCT. Format accumulates persistence of various data which can be imported from other files formats like STEP, IGES, ACIS, glTF, etc.
    BREP — ASCII persistence of shape Boundary representation used by OCCT with open specification. Supported data: shape geometry and assembly structure (defined by nested compounds, without names).
    OBJ Wavefront — format for 3D assets exchange commonly supported by modeling systems and game engines (ASCII format). Supported data: triangulation and quads, plain list of named groups, common materials with texture maps.
    VRML or WRL — ISO 14772 virtual reality modeling language (ASCII format). Supported data: triangulation, assembly structure, colors, names.

Additional mesh file formats import is supported with help of
Open Asset Import
(COLLADA, 3DS, FBX, BLEND) and
openNURBS
(3DM) libraries.

Extended CAD model import
More 3D files formats are provided by Open Cascade commercial XDE components:

    IFC import - ISO 16739 IFC2x3 and IFC4 files (ASCII format).
    JT import - ISO 14306 JT binary visualization format.
    ACIS import - SAT (ACIS Text) and SAB (ACIS Binary) files.
    DXF import - DXF files.
    Parasolid import - X_T (text) and X_B (binary) files.

  Data import provided by commercial Open Cascade components is available in CAD Assistant with one restriction — disallowed model export/conversion. Models are accessible with complete structure without model size or another limit. 


Common operations
CAD Assistant is optimized for devices with multi-touch screen and provides intuitive manipulation of the view by finger gestures:

    Select an assembly part by single tap
    Fit model/selection to the window by double tap
    Rotate by single finger
    Pan or zoom by two fingers

View Cube and context menu provide actions for fitting a model to the window and a choice of standard views. Settings submenu provides access to the viewer and application options, file information, and the message log. Clipping Planes functionality allows accessing inner model details.

CAD Assistant integrates with the OS so that applications supporting file associations will launch it for opening files of relevant types. For instance, you can open a STEP file sent to you by mail by tapping on the attachment in your mail client. Save file dialog allows saving the current image of the model to PNG format. If Mail is selected as the target directory, the mail client will be automatically started with the saved file as an attachment.

Supported platforms
Currently CAD Assistant is provided for:

    Windows platform 10 / 8.1 / 7 SP1, 64-bit (with HiDPI display support)
    macOS platform, supporting OS X 10.10 (Mavericks) and above
    Android platform, supporting version 5 and above
    iOS platform (iPad, iPhone), supporting version 8 and above

It has been tested to work on a range of modern middle-level tablets and smartphones. However, we warn smartphone users that the application is optimized for landscape screen orientation and might be inconvenient on phones in portrait orientation.

https://www.opencascade.com/products/cad-assistant/