Fix some bugs

Author: vidartf

examples/Animation.ipynb

@@ -280,6 +280,8 @@
    "metadata": {},
    "outputs": [],
    "source": [
+    "# This lets three.js create the geometry, then syncs back vertex positions etc.\n",
+    "# For this reason, you should allow for the sync to complete before executing the next cell\n",
     "morph = PlainBufferGeometry.from_geometry(SphereBufferGeometry(1, 32, 16))"
    ]
   },

examples/superellipsoid.ipynb

@@ -29,7 +29,7 @@
     "y_box = np.concatenate((-np.ones(n-1), np.linspace(-1, 1., n), np.ones(n-2), np.linspace(1, -1., n-1, endpoint=False)))\n",
     "nx_box = x_box.size\n",
     "\n",
-    "coords = np.empty((nx_box**2, 3))\n",
+    "coords = np.empty((nx_box**2, 3), dtype=np.float32)\n",
     "\n",
     "def superellipse(rx, ry, m):\n",
     "    \"\"\"\n",
@@ -176,6 +176,7 @@
     "    superellipsoid(rx_slider.value, ry_slider.value, rz_slider.value, \n",
     "                   m1_slider.value, m2_slider.value)\n",
     "    coordinate_widget.array = coords\n",
+    "    coordinate_widget.notify_changed()\n",
     "    \n",
     "m1_slider.observe(update, names=['value'])\n",
     "m2_slider.observe(update, names=['value'])\n",

pythreejs/geometries/PlainBufferGeometry.py

@@ -22,7 +22,7 @@ def validate(self, proposal):
 
         if 'index' in value:
             # We treat index special, so we might as well do some checking:
-            idx = value['index']
+            idx = value['index'].array
             array = idx.array if isinstance(idx, NDArrayWidget) else idx
             if array.dtype.kind != 'u':
                 raise TraitError('Index attribute must have unsigned integer data')