camera control

[fcollman]

could you point me to where you would control the camera position programatically on these widgets? i have very large meshes and would like to point the camera at parts of them with code..

[thewtex]

This has not been implemented yet, but we should ;-).

We could represent this as a camera traitlet on the Viewer class with content:

[[position_x, position_y, position_z],
 [focal_point_x, focal_point_y, focal_point_z],
 [view_up_x, view_up_y, view_up_z]]

and provide convenience methods, roll, azimuth, yaw, elevation, pitch on the Viewer.

@romangrothausmann @banesullivan @jourdain thoughts?

[fcollman]

Can I also suggest a setter method for taking a vtkCamera..

I have a lot of vtk code already that id just like to be able to use in a notebook where I can't have x windows.

[thewtex]

Can I also suggest a setter method for taking a vtkCamera..

👍 good idea.

We can support:

viewer.camera = vtk_camera_instance

[banesullivan]

I really like the sugesstions so far!

We could represent this as a camera traitlet on the Viewer class with content:

[[position_x, position_y, position_z],
 [focal_point_x, focal_point_y, focal_point_z],
 [view_up_x, view_up_y, view_up_z]]

This is perfectly in line with how we handle the camera in PyVista! (pyvista.Plotter.camera_position)

and provide convenience methods, roll, azimuth, yaw, elevation, pitch on the Viewer.

This seems to be something that would come after #166/#179 where the Viewer class is able to be instantiated, have data added to the scene, the camera position set, then shown - much like how PyVista Plotters are used.

[thewtex]

An initial implementation was added in #202 .

Still todo:

• Support setting with a vtkCamera instance
• Add the convenience methods for manipulating the camera

[thewtex]

vtkCamera support added in #369