Fixes to exampels

Author: vidartf

examples/BufferAttributes and BufferGeometry.ipynb

@@ -12,14 +12,10 @@
    ]
   },
   {
-   "cell_type": "code",
-   "execution_count": null,
+   "cell_type": "markdown",
    "metadata": {},
-   "outputs": [],
    "source": [
-    "#\n",
-    "# BufferAttribute\n",
-    "#"
+    "## BufferAttribute"
    ]
   },
   {
@@ -64,14 +60,10 @@
    ]
   },
   {
-   "cell_type": "code",
-   "execution_count": null,
+   "cell_type": "markdown",
    "metadata": {},
-   "outputs": [],
    "source": [
-    "#\n",
-    "# BufferGeometry\n",
-    "#"
+    "## BufferGeometry"
    ]
   },
   {
@@ -80,16 +72,17 @@
    "metadata": {},
    "outputs": [],
    "source": [
+    "scale_factor = 20\n",
     "# Simple square\n",
     "vertices = BufferAttribute(\n",
-    "    array=np.array([\n",
-    "        [-1.0, -1.0,  1.0],\n",
-    "        [ 1.0, -1.0,  1.0],\n",
-    "        [ 1.0,  1.0,  1.0],\n",
+    "    array=scale_factor * np.array([\n",
+    "        [-1.0, -1.0,  0.0],\n",
+    "        [ 1.0, -1.0,  0.0],\n",
+    "        [ 1.0,  1.0,  0.0],\n",
     "        \n",
-    "        [ 1.0,  1.0,  1.0],\n",
-    "        [-1.0,  1.0,  1.0],\n",
-    "        [-1.0, -1.0,  1.0],\n",
+    "        [ 1.0,  1.0,  0.0],\n",
+    "        [-1.0,  1.0,  0.0],\n",
+    "        [-1.0, -1.0,  0.0],\n",
     "    ], dtype=np.float32),\n",
     "    normalized=False)"
    ]
@@ -120,14 +113,14 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "vertices.array = np.array([\n",
-    "        [-1.0, -1.0,  1.0],\n",
-    "        [ 2.0, -2.0,  2.0],\n",
-    "        [ 1.0,  1.0,  1.0],\n",
+    "vertices.array = scale_factor * np.array([\n",
+    "        [-1.0, -1.0,  0.0],\n",
+    "        [ 2.0, -2.0,  1.0],\n",
+    "        [ 1.0,  1.0,  0.0],\n",
     "        \n",
-    "        [ 1.0,  1.0,  1.0],\n",
-    "        [-1.0,  1.0,  1.0],\n",
-    "        [-1.0, -1.0,  1.0],\n",
+    "        [ 1.0,  1.0,  0.0],\n",
+    "        [-1.0,  1.0,  0.0],\n",
+    "        [-1.0, -1.0,  0.0],\n",
     "    ])"
    ]
   },
@@ -137,15 +130,48 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "vertices.array = np.array([\n",
+    "vertices.array = scale_factor * np.array([\n",
+    "        [-1.0, -1.0,  0.0],\n",
+    "        [ 1.0, -1.0,  0.0],\n",
+    "        [ 1.0,  1.0,  0.0],\n",
+    "        \n",
+    "        [ 1.0,  1.0,  0.0],\n",
+    "        [-1.0,  1.0,  0.0],\n",
+    "        [-1.0, -1.0,  0.0],\n",
+    "    ])"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "print(repr(geometry))"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### Index attribute"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# Simple square with unique vertices\n",
+    "vertices = BufferAttribute(\n",
+    "    array=np.array([\n",
     "        [-1.0, -1.0,  1.0],\n",
     "        [ 1.0, -1.0,  1.0],\n",
     "        [ 1.0,  1.0,  1.0],\n",
-    "        \n",
-    "        [ 1.0,  1.0,  1.0],\n",
     "        [-1.0,  1.0,  1.0],\n",
-    "        [-1.0, -1.0,  1.0],\n",
-    "    ])"
+    "    ], dtype=np.float32),\n",
+    "    normalized=False)"
    ]
   },
   {
@@ -154,7 +180,13 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "print(repr(geometry))"
+    "# Index buffer\n",
+    "index = BufferAttribute(\n",
+    "    array=np.array([\n",
+    "        [0, 1, 2],\n",
+    "        [2, 3, 0],\n",
+    "    ], dtype=np.uint16).ravel(),\n",
+    "    normalized=False)"
    ]
   },
   {
@@ -163,9 +195,27 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "#\n",
-    "# PlainBufferGeometry.from_geometry\n",
-    "#"
+    "geometry = PlainBufferGeometry(\n",
+    "    attributes={\n",
+    "        'position': vertices,\n",
+    "        'index': index,\n",
+    "    })"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "geometry"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### PlainBufferGeometry.from_geometry"
    ]
   },
   {