On Sun, Oct 29, 2017 at 9:31 AM Simon Willerton <s.willer...@sheffield.ac.uk>
wrote:
> I have the following code to help my students visualize surfaces
>
> t, theta = var('t, theta', domain='real')
> x(t) = cosh(t)
> z(t) = t
> formula = (x(t)*cos(theta), x(t)*sin(theta), z(t))
> parameters = ((t, -3, 3), (theta, -pi, pi))
> surface = ParametrizedSurface3D(formula, parameters)
> show(surface.plot(aspect_ratio=1, color='yellow'), viewer='threejs')
>
> This works fine in SageMathCell (running SageMath 8.0) see
>
> http://simonwillerton.staff.shef.ac.uk/teaching/MAS336/sage_cell_surfaces.html
> The reason I'm using threejs is so that many plots can been seen on a
> single page. Without it (using jmol, I think) this wasn't possible.
>
> The code also works fine in a jupyter notebook running SageMath 8.0 on OS
> X in both firefox and chrome.
>
> However the code does not run in SageMath 8.0 on CoCalc. In a sagews it
> actually gives an error,
>
It works fine in CoCalc (and uses threejs) if you do not give the viewer=
option.
and in Jupyter (on firefox or chrome) the image just never appears.
> Changing the kernel to 7.6 on Jupyter on CoCalc allows the image to appear
> correctly.
>
> Should I not be using threejs or is the problem with CoCalc?
>
> Cheers,
>
> Simon
>
>
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