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, 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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