bam-serialization.rst

BAM serialization

Panda3D provides the feature to write the Panda3D objects to the disk using the BAM operations. In the navigation library, the BAM operations have been implemented over the NavMeshNode class.

.. only:: python

   .. code-block:: python

      navmeshnode = navigation.NavMeshNode("firstnavmeshnode", navmesh)
      navmeshnodepath = scene.attach_new_node(navmeshnode)

.. only:: cpp

   .. code-block:: cpp

      NavMeshNode navmeshnode = new NavMeshNode("firstnavmeshnode", navmesh);
      NodePath navmeshnodepath = scene.attach_new_node(navmeshnode);

Write BAM

You can write the 'navmeshnodepath' to the disk as a BAM file.

.. only:: python

   .. code-block:: python

      navmeshnodepath.write_bam_file("firstnavmeshnode.bam")

.. only:: cpp

   .. code-block:: cpp

      navmeshnodepath.write_bam_file("firstnavmeshnode.bam");

The BAM File 'firstnavmeshnode.bam' is stored on the disk and can be used directly in the games or the programs without building and navigation mesh again. This helps in saving time and computation power.

Read BAM

You can read the BAM File from the disk and load it as NodePath to NavMeshNode.

.. only:: python

   .. code-block:: python

      navmesh = loader.load_model("firstnavmeshnode.bam")

.. only:: cpp

   .. code-block:: cpp

      PandaFramework framework;
      framework.open_framework(argc, argv);
      framework.set_window_title("My Panda3D Window");
      WindowFramework *window = framework.open_window();
      NodePath navmesh = window->load_model(framework.get_models(), "firstnavmeshnode.bam");