handle missing vertexcolor and facecolor in mesh3d

package.json

@@ -79,7 +79,7 @@
     "gl-heatmap2d": "^1.0.5",
     "gl-line3d": "^1.1.11",
     "gl-mat4": "^1.2.0",
-    "gl-mesh3d": "^2.1.1",
+    "gl-mesh3d": "^2.1.2",
     "gl-plot2d": "^1.4.2",
     "gl-plot3d": "^2.3.0",
     "gl-pointcloud2d": "^1.0.2",

test/image/mocks/gl3d_mesh3d-mising-colors.json

@@ -0,0 +1,56 @@
+{
+  "data":  [{
+    "x": [0, 1, 0, 1, 0, 1, 0, 1],
+    "y": [0, 0, 1, 1, 0, 0, 1, 1],
+    "z": [0, 0, 0, 0, 1, 1, 1, 1],
+    "i": [0, 3, 4, 7, 0, 6, 1, 7, 0, 5, 2, 7],
+    "j": [1, 2, 5, 6, 2, 4, 3, 5, 4, 1, 6, 3],
+    "k": [3, 0, 7, 4, 6, 0, 7, 1, 5, 0, 7, 2],
+    "flatshading": true,
+    "lightposition": { "x": 1000, "y": 1000, "z": 0 },
+    "opacity": 1,
+    "vertexcolor": ["#F00", "#FF0", "#0F0", "#0FF", "#00F", "#F0F"],
+    "type": "mesh3d",
+    "name": "mesh3d",
+    "scene": "scene1"
+  }, {
+    "x": [0, 1, 0, 1, 0, 1, 0, 1],
+    "y": [0, 0, 1, 1, 0, 0, 1, 1],
+    "z": [0, 0, 0, 0, 1, 1, 1, 1],
+    "i": [0, 3, 4, 7, 0, 6, 1, 7, 0, 5, 2, 7],
+    "j": [1, 2, 5, 6, 2, 4, 3, 5, 4, 1, 6, 3],
+    "k": [3, 0, 7, 4, 6, 0, 7, 1, 5, 0, 7, 2],
+    "flatshading": true,
+    "lightposition": { "x": 1000, "y": 1000, "z": 0 },
+    "opacity": 1,
+    "facecolor": ["#F00", "#FF0", "#0F0", "#0FF", "#00F", "#F0F"],
+    "type": "mesh3d",
+    "name": "mesh3d",
+    "scene": "scene2"
+  }],
+  "layout": {
+    "paper_bgcolor": "#ddd",
+    "margin": {
+      "t": 0,
+      "b": 0,
+      "l": 0,
+      "r": 0
+    },
+    "width": 250,
+    "height": 500,
+    "scene1": {
+      "domain": {
+        "x": [0, 1],
+        "y": [0, 0.5]
+      },
+      "camera": { "eye": { "x": 1.5, "y": 3, "z": 1 } }
+    },
+    "scene2": {
+      "domain": {
+        "x": [0, 1],
+        "y": [0.5, 1]
+      },
+      "camera": { "eye": { "x": 1.5, "y": 3, "z": 1 } }
+    }
+  }
+}