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libnest2d

Notice:
This library was developed as part of the PrusaSlicer project. You can find the original version here. This repository is a continuation of the original project (effectively a fork) that contains backported stable changes and is open to further development.

License

License
libnest2d is released under terms of the LGPLv3 License. Terms of the license can be found in the LICENSE file. Or at http://www.gnu.org/licenses/lgpl.html

But in general it boils down to:
You need to share the source of any libnest2d modifications if you make an application with libnest2d.

System Requirements

Windows

  • Python 3.6 or higher
    • Ninja 1.10 or higher
    • VS2022 or higher
    • CMake 3.23 or higher
    • nmake

MacOs

  • Python 3.6 or higher
    • Ninja 1.10 or higher
    • apply clang 11 or higher
    • CMake 3.23 or higher
    • make

Linux

  • Python 3.6 or higher
    • Ninja 1.10 or higher
    • gcc 12 or higher
    • CMake 3.23 or higher
    • make

How To Build

Note:
We are currently in the process of switch our builds and pipelines to an approach which uses Conan and pip to manage our dependencies, which are stored on our JFrog Artifactory server and in the pypi.org. At the moment not everything is fully ported yet, so bare with us.

If you want to develop Cura with libnest2d see the Cura Wiki: Running Cura from source

If you have never used Conan read their documentation which is quite extensive and well maintained. Conan is a Python program and can be installed using pip

1. Configure Conan

pip install conan --upgrade
conan config install https://github.com/ultimaker/conan-config.git
conan profile new default --detect --force

Community developers would have to remove the Conan cura repository because it requires credentials.

Ultimaker developers need to request an account for our JFrog Artifactory server at IT

conan remote remove cura

2. Clone libnest2d

git clone https://github.com/Ultimaker/libnest2d.git
cd libnest2d

3. Install & Build libnest2d (Release OR Debug)

Release

conan install . --build=missing --update
# optional for a specific version: conan install . libnest2d/<version>@<user>/<channel> --build=missing --update
cmake --preset release
cmake --build --preset release

Debug

conan install . --build=missing --update build_type=Debug
cmake --preset debug
cmake --build --preset debug

Creating a new libnest2d Conan package

To create a new libnest2d Conan package such that it can be used in Cura and Uranium, run the following command:

conan create . nest2d/<version>@<username>/<channel> --build=missing --update

This package will be stored in the local Conan cache (~/.conan/data or C:\Users\username\.conan\data ) and can be used in downstream projects, such as Cura and Uranium by adding it as a requirement in the conanfile.py or in conandata.yml.

Note: Make sure that the used <version> is present in the conandata.yml in the libnest2d root

You can also specify the override at the commandline, to use the newly created package, when you execute the conan install command in the root of the consuming project, with:

conan install . -build=missing --update --require-override=libnest2d/<version>@<username>/<channel>

Developing libnest2d In Editable Mode

You can use your local development repository downsteam by adding it as an editable mode package. This means you can test this in a consuming project without creating a new package for this project every time.

conan editable add . libnest2d/<version>@<username>/<channel>

Then in your downsteam projects (Cura) root directory override the package with your editable mode package.

conan install . -build=missing --update --require-override=libnest2d/<version>@<username>/<channel>

Example

A simple example may be the best way to demonstrate the usage of the library.

#include <iostream>
#include <string>

// Here we include the libnest2d library
#include <libnest2d/libnest2d.hpp>

int main(int argc, const char* argv[]) {
    using namespace libnest2d;

    // Example polygons 
    std::vector<Item> input1(23,
    {
        {-5000000, 8954050},
        {5000000, 8954050},
        {5000000, -45949},
        {4972609, -568550},
        {3500000, -8954050},
        {-3500000, -8954050},
        {-4972609, -568550},
        {-5000000, -45949},
        {-5000000, 8954050},
    });
    std::vector<Item> input2(15,
    {
       {-11750000, 13057900},
       {-9807860, 15000000},
       {4392139, 24000000},
       {11750000, 24000000},
       {11750000, -24000000},
       {4392139, -24000000},
       {-9807860, -15000000},
       {-11750000, -13057900},
       {-11750000, 13057900},
    });

    std::vector<Item> input;
    input.insert(input.end(), input1.begin(), input1.end());
    input.insert(input.end(), input2.begin(), input2.end());

    // Perform the nesting with a box shaped bin
    size_t bins = nest(input, Box(150000000, 150000000));

    // Retrieve resulting geometries
    for(Item& r : input) {
        auto polygon = r.transformedShape();
        // render polygon...
    }

    return EXIT_SUCCESS;
}

It is worth to note that the type of the polygon carried by the Item objects is the type defined as a polygon by the geometry backend. In the example we use the clipper backend and clipper works with integer coordinates.

Ofcourse it is possible to configure the nesting in every possible way. The nest function can take placer and selection algorithms as template arguments and their configuration as runtime arguments. It is also possible to pass a progress indication functor and a stop condition predicate to control the nesting process. For more details see the libnest2d.h header file.

Example output

Alt text

Screenshot from Slic3r PE

For the record, Slic3r PE version 2.0 is now known as PrusaSlicer 2.0.

Alt text

References