Animating vedo.shapes.Spheres

I am trying to visualise a particle system using the vedo.shapes.Spheres class. This is the main loop:

    def run(self):
        print("Run simulation...")

        reset_cam = True

        while True:
            #particle_driver.collision_check()
            
            particle_driver.boundary_check()
            particle_driver.update()
            particle_driver.get_positions(self.positions)
            
            #self.points.points(self.positions)
            self.spheres.points(self.positions)

            plt.show(resetcam=reset_cam, axes=1)
            if reset_cam:
                reset_cam = False
            if plt.escaped:
                break  # if ESC is hit during the loop

Running this will display a single set of points and then crash without an exception.

particle_driver is a fortran extension module. Using vedo.mesh.Points class works.

It also works when you recreate a Spheres instance every loop iteration, but that is really slow…

Any ideas?

[jonaslindemann]

Yes. Black window appears and then disappears. No drawing from what I can see.

that’s pretty weird! But the small standalone script I sent is also failing ? Yes

Ok, I was a bit confused by the API that looked a lot like the Points API. So the spheres in Spheres are a single mesh?

Yes. And - you are right - the API similarity can be misleading… I need to clarify it in the docs.

Thanks, looks like a very impressive library. Evaluating right now for a project assignment in a Scientific Programming course.

Jonas

[jonaslindemann]

Perhaps a bug, but on Windows you can’t type vedo in the command line. For all the other scripts in this folder there are .exe equivalents. I had to do:

python vedo --info in the Scripts directory 
_________________________________________________________________
vedo version      : 2021.0.6   https://vedo.embl.es
vtk version       : 9.0.1
python version    : 3.7.11 (default, Jul 27 2021, 09:42:29) [MSC v.1916 64 bit (AMD64)]
python interpreter: C:\Anaconda3\envs\sciprog-project\python.exe
vedo installation : C:\Anaconda3\envs\sciprog-project\lib\site-packages\vedo
system            : Windows 10 nt AMD64