Fix line demo

Author: jasongrout

examples/Examples.ipynb

@@ -2,7 +2,7 @@
  "cells": [
   {
    "cell_type": "code",
-   "execution_count": 1,
+   "execution_count": null,
    "metadata": {
     "collapsed": true
    },
@@ -24,19 +24,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 2,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "data": {
-      "application/vnd.jupyter.widget-view+json": {
-       "model_id": "5a0317efcb07469392f4d41f1dad3b59"
-      }
-     },
-     "metadata": {},
-     "output_type": "display_data"
-    }
-   ],
+   "outputs": [],
    "source": [
     "ball = Mesh(geometry=SphereGeometry(radius=1), \n",
     "                                    material=LambertMaterial(color='red'),\n",
@@ -56,7 +46,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": null,
    "metadata": {
     "collapsed": true
    },
@@ -67,7 +57,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": null,
    "metadata": {
     "collapsed": true
    },
@@ -91,30 +81,11 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": null,
    "metadata": {
     "scrolled": true
    },
-   "outputs": [
-    {
-     "data": {
-      "application/vnd.jupyter.widget-view+json": {
-       "model_id": "dbbdb66ec0214df4ae0a2b8af5f483a5"
-      }
-     },
-     "metadata": {},
-     "output_type": "display_data"
-    },
-    {
-     "data": {
-      "application/vnd.jupyter.widget-view+json": {
-       "model_id": "4149a2737a234f1db7c3813346685f5e"
-      }
-     },
-     "metadata": {},
-     "output_type": "display_data"
-    }
-   ],
+   "outputs": [],
    "source": [
     "nx, ny = (20, 20)\n",
     "xmax=1\n",
@@ -162,7 +133,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 6,
+   "execution_count": null,
    "metadata": {
     "collapsed": true
    },
@@ -182,19 +153,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 7,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "data": {
-      "application/vnd.jupyter.widget-view+json": {
-       "model_id": "82d74882be1a40abaa66bc448cd47ae1"
-      }
-     },
-     "metadata": {},
-     "output_type": "display_data"
-    }
-   ],
+   "outputs": [],
    "source": [
     "import numpy as np\n",
     "from scipy import ndimage\n",
@@ -238,19 +199,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 8,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "data": {
-      "application/vnd.jupyter.widget-view+json": {
-       "model_id": "0912fdee6b9f492e9f0d20d410b7fd66"
-      }
-     },
-     "metadata": {},
-     "output_type": "display_data"
-    }
-   ],
+   "outputs": [],
    "source": [
     "# On windows, linewidth of the material has no effect\n",
     "size = 4\n",
@@ -260,14 +211,13 @@
     "                                    [0, size, 0],\n",
     "                                    [0, 0, 0],\n",
     "                                    [0, 0, size]],\n",
-    "                          faces=[[0,1,2],[2,3,1]],\n",
     "                          colors = ['red', 'red', 'green', 'green', 'white', 'orange'])\n",
-    "lines = Mesh(geometry=linesgeom, \n",
-    "             material=BasicMaterial(linewidth=5, vertexColors='VertexColors'), \n",
+    "lines = Line(geometry=linesgeom, \n",
+    "             material=LineBasicMaterial(linewidth=5, vertexColors='VertexColors'), \n",
     "             type='LinePieces')\n",
     "scene = Scene(children=[lines, DirectionalLight(color='#ccaabb', position=[0,10,0]),AmbientLight(color='#cccccc')])\n",
     "c = PerspectiveCamera(position=[0, 10, 10])\n",
-    "renderer = Renderer(camera=c, scene = scene, controls=[OrbitControls(controlling=c)])\n",
+    "renderer = Renderer(camera=c, background='black', background_opacity=1, scene = scene, controls=[OrbitControls(controlling=c)])\n",
     "display(renderer)"
    ]
   },
@@ -285,19 +235,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 9,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "data": {
-      "application/vnd.jupyter.widget-view+json": {
-       "model_id": "59e7bbdd8d70458f8fdb9cc94750f1c8"
-      }
-     },
-     "metadata": {},
-     "output_type": "display_data"
-    }
-   ],
+   "outputs": [],
    "source": [
     "f = \"\"\"\n",
     "function f(origu,origv) {\n",
@@ -336,19 +276,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 11,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "data": {
-      "application/vnd.jupyter.widget-view+json": {
-       "model_id": "a8630625d64d4f3f82d1a707b97d809d"
-      }
-     },
-     "metadata": {},
-     "output_type": "display_data"
-    }
-   ],
+   "outputs": [],
    "source": [
     "from pythreejs import *\n",
     "import numpy as np\n",
@@ -406,19 +336,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 13,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "data": {
-      "application/vnd.jupyter.widget-view+json": {
-       "model_id": "7ab6910f90c24b52bfc1a9146e55f948"
-      }
-     },
-     "metadata": {},
-     "output_type": "display_data"
-    }
-   ],
+   "outputs": [],
    "source": [
     "from pythreejs import *\n",
     "import numpy as np\n",

pythreejs/pythreejs.py

@@ -273,7 +273,7 @@ class PlainGeometry(Geometry):
 
     # TODO: vertices: numpy shape (*, 3), dtype float32
     vertices = Array(dtype='float32').tag(sync=True, **array_serialization).valid(shape_constraints(None,3))
-    faces = Array(dtype='uint32').tag(sync=True, **array_serialization).valid(shape_constraints(None,3))
+    faces = Array(dtype='uint32', default_value=np.empty(shape=(0,3), dtype='uint32')).tag(sync=True, **array_serialization).valid(shape_constraints(None,3))
     # list of [[v1_r,v1_g,v1_b], [v2_r,v2_g,v2_b], [v3_r,v3_g,v3_b]] for each face
     faceColors = Array(dtype='float32', default_value=np.empty(shape=(0,3,3), dtype='float32')).tag(sync=True, **array_serialization).valid(shape_constraints(None, 3, 3))
     #vertices = List(vector3(CFloat)).tag(sync=True)