add doCamera subroutine

- which calls scene.setCamera in relayout/update

Author: etpinard

src/plot_api/plot_api.js

@@ -1724,6 +1724,7 @@ Plotly.relayout = function relayout(gd, astr, val) {
         if(flags.dolayoutstyle) seq.push(subroutines.layoutStyles);
         if(flags.doticks) seq.push(subroutines.doTicksRelayout);
         if(flags.domodebar) seq.push(subroutines.doModeBar);
+        if(flags.docamera) seq.push(subroutines.doCamera);
     }
 
     Queue.add(gd,
@@ -1771,6 +1772,7 @@ function _relayout(gd, aobj) {
         doplot: false,
         docalc: false,
         domodebar: false,
+        docamera: false,
         layoutReplot: false
     };
 
@@ -1967,7 +1969,10 @@ function _relayout(gd, aobj) {
             var pp1 = String(p.parts[1] || '');
             // check whether we can short-circuit a full redraw
             // 3d or geo at this point just needs to redraw.
-            if(p.parts[0].indexOf('scene') === 0) flags.doplot = true;
+            if(p.parts[0].indexOf('scene') === 0) {
+                if(p.parts[1] === 'camera') flags.docamera = true;
+                else flags.doplot = true;
+            }
             else if(p.parts[0].indexOf('geo') === 0) flags.doplot = true;
             else if(p.parts[0].indexOf('ternary') === 0) flags.doplot = true;
             else if(ai === 'paper_bgcolor') flags.doplot = true;
@@ -2119,6 +2124,7 @@ Plotly.update = function update(gd, traceUpdate, layoutUpdate, traces) {
         if(relayoutFlags.dolayoutstyle) seq.push(subroutines.layoutStyles);
         if(relayoutFlags.doticks) seq.push(subroutines.doTicksRelayout);
         if(relayoutFlags.domodebar) seq.push(subroutines.doModeBar);
+        if(relayoutFlags.doCamera) seq.push(subroutines.doCamera);
     }
 
     Queue.add(gd,

src/plot_api/subroutines.js

@@ -314,3 +314,15 @@ exports.doModeBar = function(gd) {
 
     return Plots.previousPromises(gd);
 };
+
+exports.doCamera = function(gd) {
+    var fullLayout = gd._fullLayout,
+        sceneIds = Plots.getSubplotIds(fullLayout, 'gl3d');
+
+    for(var i = 0; i < sceneIds.length; i++) {
+        var sceneLayout = fullLayout[sceneIds[i]],
+            scene = sceneLayout._scene;
+
+        scene.setCamera(sceneLayout.camera);
+    }
+};