From 5f195ae6e131c7ce7329269f035d83061048ba6e Mon Sep 17 00:00:00 2001
From: t-bltg <t-bltg@users.noreply.github.com>
Date: Mon, 5 Jul 2021 11:48:48 +0200
Subject: [PATCH] add warning - enhance example

---
 src/backends/gr.jl | 29 +++++++++++++++--------------
 src/examples.jl    |  2 +-
 2 files changed, 16 insertions(+), 15 deletions(-)

diff --git a/src/backends/gr.jl b/src/backends/gr.jl
index 74f11e6633..de2d549b61 100644
--- a/src/backends/gr.jl
+++ b/src/backends/gr.jl
@@ -1863,6 +1863,7 @@ function gr_draw_surface(series, x, y, z, clims)
         GR.setfillcolorind(0)
         GR.surface(x, y, z, get(e_kwargs, :display_option, GR.OPTION_FILLED_MESH))
     elseif st === :mesh3d
+        @warn "mesh3d support is experimental in GR"
         conn = series[:connections]
         if typeof(conn) <: Tuple{Array, Array, Array}
             ci, cj, ck = conn
@@ -1872,25 +1873,25 @@ function gr_draw_surface(series, x, y, z, clims)
         else
             throw(ArgumentError("Argument connections has to be a tuple of three arrays."))
         end
-        xx = zeros(eltype(x), 4length(ci))
-        yy = zeros(eltype(y), 4length(cj))
-        zz = zeros(eltype(z), 4length(ck))
+        X = zeros(eltype(x), 4length(ci))
+        Y = zeros(eltype(y), 4length(cj))
+        Z = zeros(eltype(z), 4length(ck))
         @inbounds for I ∈ 1:length(ci)
             i = ci[I] + 1  # connections are 0-based
             j = cj[I] + 1
             k = ck[I] + 1
             m = 4(I - 1) + 1; n = m + 1; o = m + 2; p = m + 3
-            xx[m] = xx[p] = x[i]
-            yy[m] = yy[p] = y[i]
-            zz[m] = zz[p] = z[i]
-            xx[n] = x[j]
-            yy[n] = y[j]
-            zz[n] = z[j]
-            xx[o] = x[k]
-            yy[o] = y[k]
-            zz[o] = z[k]
-        end
-        GR.polyline3d(xx, yy, zz)
+            X[m] = X[p] = x[i]
+            Y[m] = Y[p] = y[i]
+            Z[m] = Z[p] = z[i]
+            X[n] = x[j]
+            Y[n] = y[j]
+            Z[n] = z[j]
+            X[o] = x[k]
+            Y[o] = y[k]
+            Z[o] = z[k]
+        end
+        GR.polyline3d(X, Y, Z)
     else
         throw(ArgumentError("Not handled !"))    
     end
diff --git a/src/examples.jl b/src/examples.jl
index dd4eb8c466..1a280d80c3 100644
--- a/src/examples.jl
+++ b/src/examples.jl
@@ -1021,7 +1021,7 @@ const _examples = PlotExample[
 			k=[2, 3, 1, 3]
 
 			# the four triangles gives above give a tetrahedron
-			mesh3d(x,y,z;connections=(i,j,k))
+			mesh3d(x, y, z; connections=(i, j, k), title="triangles", legend=:none, margins=2Plots.mm)
 		  end
 		),
 	],