Rotating the camera around a figure | Rotating the figure itself

[TheRealVira]

Hi! I am currently working on a 3D to 2D ASCII art plotter and am using your library for it. You can read more information about that here:

https://github.com/TheRealVira/asciisight

Anyways... The rotation seems to be a bit broken and I am just very confused as of why. Another solution would have been to rotate the figure itself, but I don't seem to find any function for that inside your API. Feedback would be very appreciated 😄

Looking forward to hearing from you!

[bwoodsend]

In 3D, rotation is a bit more complex because there are 3 axes to rotate around rather than just one which means that you'll need 6 keys instead of just 4 to control them all (assuming you're interested in all 3).

As for actually controlling the orientation, the only function vtkplotlib provides is view() which sets absolute orientations using unit vectors but I imagine that you want the exact opposite - to incrementally adjust the orientation using yaw, pitch and roll angles. In which case you can use VTK's own methods directly. The camera is located at fig.camera. To give you an example:

import vtkplotlib as vpl

fig = vpl.figure()
vpl.mesh_plot(vpl.data.get_rabbit_stl())
text = vpl.text("", color="r")

while True:
    text.text = "Incrementing Yaw"
    for i in range(120):
        fig.camera.Yaw(3)
        fig.reset_camera()
        fig.update()

    text.text = "Incrementing Pitch"
    for i in range(120):
        fig.camera.Pitch(3)
        fig.reset_camera()
        fig.update()

    text.text = "Incrementing Roll"
    for i in range(120):
        fig.camera.Roll(3)
        fig.reset_camera()
        fig.update()

[TheRealVira]

Thank you - that was very useful!

[bwoodsend]

You're welcome.