View setting of setup_camera function in O3DVisualizer class

[Zhouwudexiazhou]

Checklist

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

My Question

The value of filed_of_view in the _camera function does not change the final render image? I set one to 60 degrees and the other to 10 degrees, but the picture is the same.
This is photo with value in 10 degrees.

This is photo with value in 60 degrees.

the code is :
import open3d as o3d
import numpy as np
o3d.visualization.gui.Application.instance.initialize()
pcd = o3d.io.read_point_cloud("D:/MPEG/mpeg-pcc-tmc2/mpeg_datasets/longdress/Ply/longdress_vox10_1051.ply")
box = pcd.get_axis_aligned_bounding_box()
min_box = box.get_min_bound()
max_box = box.get_max_bound()
center = (max_box + min_box) / 2
eye = np.array(center) + np.array([0, 0, 700])
vis = o3d.visualization.O3DVisualizer("3DVis", width=1920, height=1080)
vis.add_geometry(name="point_cloud", geometry=pcd, is_visible=True)
vis.point_size = 2
bg_color = np.array([255.0, 255.0, 255.0, 1.0], dtype=np.float32).reshape(4, 1)
vis.set_background(bg_color, None)
vis.post_redraw()
vis.enable_raw_mode(enable=True)
vis.show_skybox(show=False)
field_of_view = 60.0
center = np.array(center, dtype=np.float32)
eye = np.array(eye, dtype=np.float32)
up = np.array([0.0, 1.0, 0.0], dtype=np.float32)
vis.setup_camera(field_of_view, center, eye, up)
vis.post_redraw()
o3d.visualization.gui.Application.instance.add_window(vis)
path = r"D:\photo\photo2.png"
vis.export_current_image(path)
o3d.visualization.gui.Application.instance.run()

[cwreynolds]

@Zhouwudexiazhou tracked this down (see #7031) and found that the problem is that open3d::visualization::visualizer::O3DVisualizer::SetupCamera(fov, center, eye, up) simply ignores the fov parameter passed to it.

I assumed a work-around would be to use something like the legacy api open3d.visualization.ViewControl.change_field_of_view() but I do not see anything like that in the O3DVisualizer source.

This seems to be a bug, or perhaps two (SetupCamera ignores fov, and perhaps: missing api to set field-of-view). I think the bug tag should be added this issue. As far as I know, I cannot do that myself. Could someone else (@ssheorey ?) look at this and add the bug tag if needed? If so, perhaps the title should be changed.