Animate different actors one at the time about vedo HOT 10 CLOSED

Hi @vianamp
thanks for your interest!
Actually the show() command should be inside the loop. Check out for example this:

from vtkplotter import *
import numpy as np

vp = Plotter(interactive=False)
coo = np.random.rand(32*12).reshape(32,12)

for i in range(len(coo)):
    u = coo[i,3:6]
    v = coo[i,6:9]
    q = coo[i,9:12]
    ell = Ellipsoid(pos=(2.5*coo[i,0], 2.5*coo[i,1], 2.5*coo[i,2]),
                    axis1=u, axis2=v, axis3=q)
    scals = [i] * ell.N()
    ell.pointColors(scals, vmin=0, vmax=31)
    vp += ell
    vp.show()

interactive()

Let me know if you need more help. Also, you can find more examples of animations in example/simulations directory which may fit your need.

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Yes.. the jupyter functionality is still experimental and at the moment is not working well with loops.
It' s on my to-do list..
If you need to work in notebooks you still have the option of setting:

from vtkplotter import *
embedWindow(False)

then the normal vtk rendering window will pop up.

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Thanks for quick reply. What if I need only one timepoint to be shown at the time? And also to keep the bounding box fixed at the largest size that fits all the objects?

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Also, I got this error when I tried to run your code on a jupyter notebook:

AttributeError                            Traceback (most recent call last)
<ipython-input-12-4b069e1c07cd> in <module>()
     13     vp.show()
     14 
---> 15 interactive()

~/anaconda3/envs/qcb/lib/python3.6/site-packages/vtkplotter/plotter.py in interactive()
    259     if settings.plotter_instance:
    260         if hasattr(settings.plotter_instance, 'interactor'):
--> 261             settings.plotter_instance.interactor.Start()
    262     return settings.plotter_instance
    263 

AttributeError: 'NoneType' object has no attribute 'Start'

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There are 2 ways of doing it:

• either you create an invisible box that contains the object that you want to create afterwards or
• render the scene once outside the loop with e.g. vp.show(world, ell, resetcam=False)

from vtkplotter import *
import numpy as np

vp = Plotter(interactive=False)
coo = np.random.rand(32*12).reshape(32,12)
world = Box([1,1,1], 5,5,5).wireframe().alpha(0) ##########

for i in range(len(coo)):
    u = coo[i,3:6]
    v = coo[i,6:9]
    q = coo[i,9:12]
    ell = Ellipsoid(pos=(2.5*coo[i,0], 2.5*coo[i,1], 2.5*coo[i,2]),
                    axis1=u, axis2=v, axis3=q)
    scals = [i] * ell.N()
    ell.pointColors(scals, vmin=0, vmax=31)
    vp.show(world, ell)
    
interactive()

About the jupyter thing indeed this a current limitation (or ... bug) due to how the K3D backend works...
One needs to collect the object returned by show() and then just expose it outside the loop...

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I see what you mean. My final code looks like this:

np.random.seed(1234)
n = 8
vp = Plotter(interactive=False)
coo = np.random.rand(n*12).reshape(n,12)
world = Box([1,1,1], 5,5,5).wireframe().alpha(0)
for i in range(n):
    u = coo[i,3:6]
    v = coo[i,6:9]
    q = coo[i,9:12]
    ell = Ellipsoid(pos=(2.5*coo[i,0], 2.5*coo[i,1], 2.5*coo[i,2]), axis1=u, axis2=v, axis3=q)
    scals = [i] * ell.N()
    ell.pointColors(scals, vmin=0, vmax=n)
    vp += ell
    plt = vp.show(world, ell, resetcam=False)
plt

However, I don't actually see the animation. Only the last timepoint is shown.

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How to fix the viewing angle to the first frame. The object moves a little bit in the following gif.

Thanks~
@marcomusy

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you can either add an invisible box:
vp += Box((1,1,1), length=5, width=5, height=5).wireframe().alpha(0)
or avoid resetting the camera later with
vp.show(resetcam=False)

in the ex. above, as the the object are added randomly, the first solution is probably the best.

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Hi, marcomusy~

How to add a description for each frame like: "frame: {}/{}.format(current, all)"?

If I set by txt = Text(...) with background, it seems to get slower and slower, if I use vp.clear(txt), there will be flashes.

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@LogWell
thanks for spotting the problem, I'll investigate that.

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