[v2] Support for colors and opacity in mesh3d in pgfplotsx (#5216)

* Enable color and opacity in mesh3d in pgfplotsx backend

* Add entry to zendo

Author: darnstrom

.zenodo.json

@@ -810,6 +810,11 @@
             "orcid": "0009-0003-6525-7413",
             "type": "Other"
         },
+        {
+            "name": "Daniel Arnström",
+            "orcid": "0000-0003-0970-0620",
+            "type": "Other"
+        },
         {
             "affiliation": "@JuliaComputing",
             "name": "Παναγιώτης Γεωργακόπουλος",

PlotsBase/ext/PGFPlotsXExt.jl

@@ -738,6 +738,10 @@ function pgfx_add_series!(::Val{:mesh3d}, axis, series_opt, series, series_func,
         "patch" => nothing,
         "table/row sep" => "\\\\",
         "patch table" => join(ptable, "\n        "),
+        "fill" => opt[:fillcolor],
+        "faceted color" => opt[:linecolor],
+        "opacity" => something(get_fillalpha(series), 1.0),
+        "draw opacity" => something(get_linealpha(series), 1.0),
     )
     return pgfx_add_series!(axis, series_opt, series, series_func, opt)
 end