aspect ratio 3d

src/axes.jl

@@ -642,8 +642,9 @@ function axis_limits(
         !has_user_lims &&
         consider_aspect &&
         letter in (:x, :y) &&
-        !(sp[:aspect_ratio] in (:none, :auto) || RecipesPipeline.is3d(:sp))
+        sp[:aspect_ratio] in (:none, :auto)
     )
+        if !RecipesPipeline.is3d(:sp)
             aspect_ratio = isa(sp[:aspect_ratio], Number) ? sp[:aspect_ratio] : 1
             plot_ratio = height(plotarea(sp)) / width(plotarea(sp))
             dist = amax - amin
@@ -665,8 +666,31 @@ function axis_limits(
                 amin = center + factor * (amin - center)
                 amax = center + factor * (amax - center)
             end
+        else
+        end
+    end
+    if RecipesPipeline.is3d(:sp)
+        xs = sp[1][:x]
+        ys = sp[1][:y]
+        zs = sp[1][:z]
+        x12, y12, z12 = extrema(xs), extrema(ys), extrema(zs)
+        d = maximum([diff([x12...]),diff([y12...]),diff([z12...])])[1] / 2
+        xm, ym, zm = mean(x12),  mean(y12),  mean(z12)
+        amin = if letter == :x
+            xm-d
+        elseif letter == :y
+            ym-d
+        elseif letter ==:z
+            zm-d
+        end
+        amax = if letter == :x
+            xm+d
+        elseif letter == :y
+            ym+d
+        elseif letter ==:z
+            zm+d
+        end
     end
-
     return amin, amax
 end