Merge pull request #6581 from dmyronuk/bugfix-scatter3d-marker-opacity

#6571 fix scatter3d marker opacity when marker.opacity is set to 0

Author: archmoj

draftlogs/6581_fix.md

@@ -0,0 +1 @@
+ - fix scatter3d when `marker.opacity` is set to zero [[#6581](https://github.com/plotly/plotly.js/pull/6581)], with thanks to @dmyronuk for the contribution!

src/traces/scatter3d/convert.js

@@ -403,7 +403,7 @@ proto.update = function(data) {
 
     // N.B. marker.opacity must be a scalar for performance
     var scatterOpacity = data.opacity;
-    if(data.marker && data.marker.opacity) scatterOpacity *= data.marker.opacity;
+    if(data.marker && data.marker.opacity !== undefined) scatterOpacity *= data.marker.opacity;
 
     scatterOptions = {
         gl: this.scene.glplot.gl,

test/jasmine/tests/scatter3d_test.js

@@ -329,4 +329,21 @@ describe('Test scatter3d interactions:', function() {
         })
         .then(done, done.fail);
     });
+
+    it('@gl markers should be transparent when marker.opacity is 0', function(done) {
+        Plotly.newPlot(gd, [
+            {
+                type: 'scatter3d',
+                x: [0],
+                y: [0],
+                z: [0],
+                mode: 'markers',
+                marker: { opacity: 0 }
+            },
+        ])
+        .then(function() {
+            expect(gd._fullLayout.scene._scene.glplot.objects[0].opacity).toEqual(0);
+        })
+        .then(done, done.fail);
+    });
 });