How to add a button to prompt the user to open a file using KeyCallback function

[InquisitiveAS]

Checklist

• [X] I have searched for similar issues.
• [X] For Python issues, I have tested with the latest development wheel.
• [X] I have checked the release documentation and the latest documentation (for master branch).

My Question

I want to start with basic example of adding a button inside my GUI which will have Keycallback function to load different geometry types

My Code

import open3d as o3d

def load_geometry(vis_Button):
    file_path = o3d.utility.FileDialog.get_open_file_name("Select a geometry file.")
    if file_path:
        ext = file_path.split(".")[-1]
        if ext == "ply":
            geometry = o3d.io.read_point_cloud(file_path)
        elif ext == "txt":
            geometry = o3d.io.read_point_cloud(file_path, format="xyz")
        elif ext == "stl":
            geometry = o3d.io.read_triangle_mesh(file_path)
        elif ext == "obj":
            geometry = o3d.io.read_triangle_mesh(file_path)
        else:
            print("Unsupported geometry file format!")
            return
        vis_Button.add_geometry(geometry)

vis = o3d.visualization.VisualizerWithKeyCallback()
vis.create_window()

vis.register_key_callback(ord('a'), lambda vis: load_geometry(vis))

[ssheorey]

With GUI, you can only use O3DVisualizer (or APIs in visualization.renderingand visualization.gui namespaces). We do plan to make this easier to track in future releases. @errissa

[InquisitiveAS]

Thanks for the update!