Hover callback not working on points object

[davidwhealey]

I'm attempting to apply callbacks to points objects so I can plot some data and display information about the points interactively. Running the mesh_callback.ipynb example works, but if I replace the mesh with points, the callback no longer displays any labels.
Any help in figuring out how to get callbacks on single points of data would be helpful. Thank you!

import k3d
import numpy as np

points_number = 500
positions = 50 * np.random.random_sample((points_number,3)) - 25
point_size = 2
colors = np.random.randint(0, 0xFFFFFF, points_number)

plot = k3d.plot(name='points')
points = k3d.points(
    positions.astype(np.float32), 
    colors.astype(np.uint32), 
    point_size=point_size, 
    shader='dot'
)

label = k3d.label('', mode='local', color=0x0)

plot += points
plot += label

def update_label(p):
    global label    
    label.text = '\\vec{n} = \\begin{bmatrix} ' + "\\\\".join([str(v) for v in p['normal']]) +' \\end{bmatrix}'
    label.position = p['position']

points.hover_callback = update_label

plot.display()
plot.mode = 'callback'

• K3D version:2.4.15
• Python version: 3.9.10
• Operating System: OS X 11.6.5

[davidwhealey]

Oh, I have just discovered that callbacks only work on surfaces and not points and lines.