Change i,j,k to series keyword

src/args.jl

@@ -288,6 +288,7 @@ const _series_defaults = KW(
                                      #     one logical series to be broken up (path and markers, for example)
     :hover              => nothing,  # text to display when hovering over the data points
     :stride             => (1,1),    # array stride for wireframe/surface, the first element is the row stride and the second is the column stride.
+    :connections	=> nothing,  # tuple of arrays to specifiy connectivity of a 3d mesh
     :extra_kwargs       => Dict()
 )
 

src/backends/plotly.jl

@@ -574,11 +574,19 @@ function plotly_series(plt::Plot, series::Series)
     elseif st == :mesh3d
 	plotattributes_out[:type] = "mesh3d"
         plotattributes_out[:x], plotattributes_out[:y], plotattributes_out[:z] = x, y, z
-        
-	if :i in keys(series[:extra_kwargs]) && :j in keys(series[:extra_kwargs]) && :k in keys(series[:extra_kwargs])
-		plotattributes_out[:i] = series[:extra_kwargs][:i]
-		plotattributes_out[:j] = series[:extra_kwargs][:j]
-		plotattributes_out[:k] = series[:extra_kwargs][:k]
+       
+	if series[:connections] != nothing
+		if typeof(series[:connections]) <: Tuple{Array,Array,Array} 
+			i,j,k = series[:connections]
+			if length(i) == length(j) == length(k)
+				throw(ArgumentError("Argument connections must consist of equally sized arrays."))
+			end
+			plotattributes_out[:i] = i
+			plotattributes_out[:j] = j
+			plotattributes_out[:k] = k
+		else
+			throw(ArgumentError("Argument connections has to be a tuple of three arrays."))
+		end
 	end
 
 	plotattributes_out[:colorscale] = plotly_colorscale(series[:fillcolor], series[:fillalpha])

src/pipeline.jl

@@ -331,8 +331,7 @@ function _override_seriestype_check(plotattributes::AKW, st::Symbol)
     if !RecipesPipeline.is3d(st) && !(st in (:contour, :contour3d))
         z = plotattributes[:z]
         if !isa(z, Nothing) &&
-           (size(plotattributes[:x]) == size(plotattributes[:y]) == size(z)) &&
-	   st !== :mesh3d
+           (size(plotattributes[:x]) == size(plotattributes[:y]) == size(z)) 
             st = (st == :scatter ? :scatter3d : :path3d)
 	    plotattributes[:seriestype] = st
         end

src/recipes.jl

@@ -1547,4 +1547,3 @@ julia> areaplot(1:3, [1 2 3; 7 8 9; 4 5 6], seriescolor = [:red :green :blue], f
     end
 end
 
-is_3d(::Type{Val{:mesh3d}}) = true