plot3d method does not properly work with threejs

asked 2020-02-25 04:37:40 -0500

Juanjo gravatar image

The plot3d method allows to embed 2D objects in 3D graphics. It seems to work properly with the jmol viewer. However, it fails when the viewer is threejs. For example, the code

p = sum(plot((5-k)*sin(x), 0, 10, thickness=10,
             color=colormaps.jet(50*k)).plot3d(z=k) for k in range(6))
show(p, viewer="jmol")
show(p, viewer="threejs")

yields this result:

image description

The first graphic, corresponding to jmol, is correct. The second graphic, produced by threejs, is completely wrong.

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Comments

Doing sum(parametric_plot3d([x,(5-k)*sin(x), k], (x, 0, 10)) for k in range(6)) gives the same result in both viewers, but threejs doesn't seem to like this thickness or color.

rburing gravatar imagerburing ( 2020-02-25 09:09:32 -0500 )edit

Certainly it is possible to search workarounds. But what I just wanted is to draw attention to the fact that the default viewer does not behave properly in the described situation. The example given in the docs (search for plot3d in this page) does not longer work. Perhaps somebody who knows to open trac tickets could add one on this issue.

Juanjo gravatar imageJuanjo ( 2020-02-26 16:45:06 -0500 )edit

This is now https://trac.sagemath.org/ticket/29251. Thanks for having reported this bug!

eric_g gravatar imageeric_g ( 2020-02-27 06:46:57 -0500 )edit

sagemath notebook 9.0 ,OS Ubuntu 18.04 yes threejs do not care about color.

a = vector([1, 2,5])
b = vector([4, 3,3])
plot(a, color='red')
P=plot(a, color='red') + plot(b, color='blue') + plot(a + b, color='black')
show(P, viewer="jmol")
show(P, viewer="threejs")

moreover both viewer do not accept 2d vectors

a = vector([1, 2])
b = vector([4, 3])
plot(a, color='red')
P=plot(a, color='red') + plot(b, color='blue') + plot(a + b, color='black')
show(P, viewer="jmol")
show(P, viewer="threejs")

matplotlib() got an unexpected keyword argument 'viewer'

ortollj gravatar imageortollj ( 2020-04-16 03:24:50 -0500 )edit

The issue reported in the original question is fixed in the release candidate of SageMath 9.1 (to be out soon).

eric_g gravatar imageeric_g ( 2020-04-20 07:14:55 -0500 )edit