polygon3d ignores the "alpha" (and equivalent "opacity") argument

[yuan-zhou]

The methods sage.plot.plot3d.shapes2.polygon3d and sage.plot.plot3d.shapes2.polygons3d have the keyword argument "alpha" (as well as the equivalent, outdated "opacity" argument). However it is not passed to the plot function. For example,

polygon3d([[1, 2, 3], [0,1,0], [1,0,1], [3,0,0]], color=(0,1,0), alpha=0.5)

or

polygon3d([[1, 2, 3], [0,1,0], [1,0,1], [3,0,0]], color=(0,1,0), opacity=0.5)

is treated as opacity=1.

Related tickets:
#21984
Update: The argument "alpha" is equivalent to "opacity" in all the 3d plot functions, such as point3d, line3d, sphere, icosahedron, tetrahedron, dodecahedron, polygon3d, polygons3d, bezier3d, parametric_plot3d, revolution_plot3d, `arrow3d', etc.

#260, #9491, #15729, #21984, #23104.

CC: @mkoeppe @slel

Component: graphics

Keywords: IMA-PolyGeom, alpha, opacity, transparency, 3d

Author: Yuan Zhou

Branch/Commit: 93fe1e2

Reviewer: Jean-Philippe Labbé

Issue created by migration from https://trac.sagemath.org/ticket/25095

[yuan-zhou]

Branch: u/yzh/polygon3d_ignores_the__opacity__argument

[yuan-zhou]

New commits:

f96943f	pass extra kwds such as opacity in IndexFaceSet
8948ca2	remove obsolete docstring

[yuan-zhou]

Author: Yuan Zhou

[yuan-zhou]

Commit: 8948ca2

[slel]

comment:3

For consistency, use alpha instead of opacity, see #21984.

[slel]

Changed keywords from IMA-PolyGeom to IMA-PolyGeom, alpha, opacity, transparency, 3d

[slel]

comment:4

Related tickets: #260, #9491, #15729, #21984, #23104.

[sagetrac-git]

Changed commit from 8948ca2 to 6d6a251