tubular-cpp, curves primitive to tubular mesh converter in C++

C++ port of unity-tubular https://github.com/mattatz/unity-tubular

Currently .xpd curve data is supported.

Assume Catmull-Rom curves.

Requirements

• cmake
• C++11 compiler(clang recommended)

Supported platform

• Linux 64bit
• macOS
• Windows(Visual Studio 2017 or later)
• Android(will work)

Supported curve data

• Xgen .xpd https://github.com/syoyo/tinyxpd
  • https://knowledge.autodesk.com/support/maya/learn-explore/caas/CloudHelp/cloudhelp/2019/ENU/Maya-CharEffEnvBuild/files/GUID-43899CB9-CE0F-476E-9E94-591AE2F1F807-htm.html
• CyHair http://www.cemyuksel.com/research/hairmodels/
  • Per-CV radius(thickness)
• Photobooth https://people.csail.mit.edu/sparis/publi/2008/siggraphHair/#docs
• Alembic curves?

Build

Mac or Linux

$ ./bootstrap-clang.sh
$ cd build
$ make

Windows

For command prompt or PowerShell, simply run vcsetup.bat (Use VS2017)

For Git for Windows terminal(mintty bash), run

$ cmd //c vcsetup.bat

Usage

Convert curves data to wavefront .obj. Setting is done in config.json file.

{
    "xpd_filepath": "/path/to/hoge.xpd",
    "cyhair_filepath": "/path/to/cyhair.hair",
    "obj_filepath": "/pat/to/hoge.obj",
    "pbrt_filepath": "/pat/to/gogo.pbrt",
    "max_segments": 15,
    "radial_segments": 3,
    "radius_scale": 1.0,
    "user_radius": -1.0,
    "fix_normal": [
        0.0,
        0.0,
        -1.0
    ],
    "one_side_plane": false
}

Input curves can be speficied either xpd_filepath or cyhair_filepath.

• xpd_filepath Input .xpd file (str)
• cyhair_filepath Input cyhair .hair file (str)
• obj_filepath Outout wavefront .obj (str)
• pbrt_filepath Outout .pbrt (str) (.pbrt will just output all the things ignoring the following)
• max_segments The maximum number of segments per strand　(int)
• radial_segments The number of radial segments (int)
• radius_scale radius scale (float)
• user_radius Use user supplied radius. If user_radius is negative, tubular uses the thicknesses stored in curves data(cyhair only for now). (float)
• fix_normal Make faces face the specified direction. (float x 3)
• one_side_plane When radial_segments is 2, use one side planes. (bool)

How to execute

$ ./tubular-cli /path/to/config.json

TODO

• Interactive GUI
• Support more curves format
  • Cyhair
  • Alembic
  • RenderMan RiCurves?

License

tubular-cpp is licensed under MIT license.

Third party licenses

• unity-tubular MIT License
• StaticJSON MIT License
• RapidJSON The 3-Clause BSD License
• TinyXPD MIT License
• tinyobjloader MIT License
• spdlog MIT License