bug in camera

[marcomusy]

It seems that camera is not updated when viewup is modified but camera position is not changed:

import k3d
import numpy as np
from numpy import sin,cos,pi
from ipywidgets import interact, interactive, fixed
import ipywidgets as widgets
import time
import math

plot = k3d.plot()

plot.camera_auto_fit = False

T = 1.618033988749895
r = 4.77
zmin,zmax = -r,r
xmin,xmax = -r,r
ymin,ymax = -r,r
Nx,Ny,Nz = 77,77,77

x = np.linspace(xmin,xmax,Nx)
y = np.linspace(ymin,ymax,Ny)
z = np.linspace(zmin,zmax,Nz)
x,y,z = np.meshgrid(x,y,z,indexing='ij')
p = 2 - (cos(x + T*y) + cos(x - T*y) + cos(y + T*z) + cos(y - T*z) + cos(z - T*x) + cos(z + T*x))
iso = k3d.marching_cubes(p.astype(np.float32),xmin=xmin,xmax=xmax,ymin=ymin,ymax=ymax, zmin=zmin, zmax=zmax, level=0.0)
plot += iso

plot.display()

this doesnt work:

@interact(rad=widgets.FloatSlider(value=0,min=0,max=1,step=0.01))
def g(rad):
    plot.camera = [8,0,8,
                   0,0,0,
                   0,1-rad,rad]

while this works:

@interact(rad=widgets.FloatSlider(value=0,min=0,max=1,step=0.01))
def g(rad):
    plot.camera = [8,0,8+rad/100,
                   0,0,0,
                   0,1-rad,rad]

[artur-trzesiok]

Nice spot! This is a issue in ThreeJs: https://github.com/mrdoob/three.js/blob/master/examples/js/controls/TrackballControls.js#L357

ThreeJs emite change event only if position change. They ignore a up vector. You can add them a issue.

[artur-trzesiok]

@marcomusy can you confirm that in 2.7.0 this issue is already fixed?

[marcomusy]

Hi @artur-trzesiok sorry for the late reply - this slipped off my mind - I just tried it again with the above example and I still get the same weird behavior in k3d 2.7.

[artur-trzesiok]

Can you double check version of js part of k3d?

[marcomusy]

oh yes - that shows 2.6.9
what should i do to trigger the update?

[marcinofulus]

If you use conda package and the same env for both notebook then it should work. You might want to restart notebook. In other cases it might be necessary to use:

• jupyter nbextension install --sys-prefix --py k3d
• jupyter nbextension enable --sys-prefix --py k3d

[marcomusy]

Hi @marcinofulus I tried but still get the 2.6.9 js version..
I also tried restarting the browser.. any ideas?

[marcinofulus]

check for jupyter --paths: - perhaps you have k3d installed in a multiple locations e.g both in system and user space. Also have a look at jupyter nbextension list. It is possible that you will have to delete some location if there are doubled.

In principle, if jupyter notebook is running kernel from some different env - then I use --user for nbextensions (like central jupyterhub installations)