#12212: Colormap for implicit_plot3d and parametric_plot3d
-------------------------------------+-------------------------------------
Reporter: niles | Owner: jason, was
Type: defect | Status: needs_work
Priority: major | Milestone: sage-6.5
Component: graphics | Resolution:
Keywords: colormap, plot | Merged in:
Authors: Joris | Reviewers: Frédéric Chapoton,
Vankerschaver, Frédéric Chapoton | Niles Johnson, Karl-Dieter Crisman,
Report Upstream: N/A | Jonathan Gutow
Branch: u/chapoton/12212 | Work issues: update documentation
Dependencies: | and examples
| Commit:
| be9d2a587dc3d7bfcb9c9e19689e8fa2feec104b
| Stopgaps:
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Comment (by chapoton):
Thanks for the interactive. Here is a slightly modified version, with
canvas3D and colormap names
{{{
var('x,y,z')
t = sin(z).function(x,y,z)
@interact
def _(cm=[colormaps[c].name for c in colormaps], v=['jmol', 'tachyon',
'canvas3d']):
show(implicit_plot3d(z-x*x-y*y,(x,-2,2),(y,-2,2),(z,-1,4),color=(t,colormaps[cm]),viewer=v))
}}}
One can note the canvas3d does not have the same viewpoint. One can also
not that the colors do not look quite the same between the viewers. Maybe
a difference in global lighting ?
Concerning setting the color 0 to 1 : it happens inside a jmol specific
function, and after the color has been turned into an integer between `0`
and `2**24`. So changing 0 to 1 here does not affect at all the other
viewers, and should only change total black into almost total black, so
should not have any visible effect on jmol output (except making it work
slightly more often).
I am also not quite satisfied with this buggy behaviour, but something is
better than nothing. Nevertheless it could still be that the problem is in
our dialog with jmol and not in jmol itself : are we coding the colors
correctly ? I thought so, but maybe this needs to be checked. I have tried
to navigate the jmol code, but did not manage to find something useful
about color encoding.
--
Ticket URL: <http://trac.sagemath.org/ticket/12212#comment:147>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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