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Loads a new document on the current screen from a specified file on disk. Once a file has been selected, the current file will be closed if any is open. If there are unsaved changes, you will be prompted to save them before closing. If the "Preserve camera between files" setting is active, the current camera angle will not be changed; see [link=preferences]preferences[/link] for details.

Types of files that can be loaded:
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[*]stem3d: Editable Stem3D Modeler mesh document. A binary format containing all editable document data used on the [link=screen_mesh_editor]mesh editor[/link] screen, including vertices, faces, textures, partitions, deformations, materials, an optional armature, image overlays, saved camera angles, and various settings and parameters. This file format is suitable only for data to be edited within this program; other formats are more suitable for rendering or interchange between programs.
[*]obj: Wavefront .obj file. A simple textual model format suitable for very basic rendering and interchange needs. Only a limited subset of mesh data can be represented in this format; see [link=export_mesh]Export Mesh[/link] for more details. .obj files may have an associated .mtl file, which stores material and texture info, and may reference additional image files for texture data.
[*]mesh: Renderable libstem mesh data file. This format includes only the relevant information for rendering, and is not suitable for storing editable data. No non-triangulated faces can be represented in this format. Texture, material, and partition data is included, and arbitrary vertex formats are representable, though [!todo]they cannot currently be exported by Stem3D Modeler.
[*]glb: Binary glTF document, suitable for rendering. The feature set of glTF is richer than that of .obj, allowing armature data and more extensive texture data to be stored. However, unlike .obj, all face data must be triangulated, making this format unsuitable for editable data interchange. .glb and .gltf files can include all of their data in a single file, or reference one or more companion files; see [link=export_mesh]Export Mesh[/link] for more details.
[*]gltf: JSON glTF document. Contains equivalent information to a .glb file, formatted for human readability.
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