Add pyvista example

Signed-off-by: martinRenou <[email protected]>

Author: martinRenou

environment.yml

@@ -3,6 +3,7 @@ channels:
 dependencies:
   - vtk
   - h5py
+  - pyvista
   - pythreejs
   - nodejs
   - ipygany=0.3.3

examples/pyvista.ipynb

@@ -0,0 +1,59 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "from pyvista import examples\n",
+    "import numpy as np\n",
+    "\n",
+    "from ipywidgets import VBox, FloatSlider\n",
+    "from ipygany import PolyMesh, Scene, IsoColor, WarpByScalar\n",
+    "\n",
+    "pvmesh = examples.download_topo_global()\n",
+    "ugrid = pvmesh.cast_to_unstructured_grid()\n",
+    "\n",
+    "from ipygany import PolyMesh, Scene, IsoColor, WarpByScalar\n",
+    "\n",
+    "# Turn the PyVista mesh into a PolyMesh\n",
+    "mesh = PolyMesh.from_vtk(ugrid)\n",
+    "\n",
+    "colored_mesh = IsoColor(mesh, min=-10421.0, max=6527.0)\n",
+    "warped_mesh = WarpByScalar(colored_mesh, input='altitude', factor=0.5e-5)\n",
+    "\n",
+    "# Link a slider to the warp value\n",
+    "warp_slider = FloatSlider(min=0., max=5., value=0.5)\n",
+    "\n",
+    "def on_slider_change(change):\n",
+    "    warped_mesh.factor = change['new'] * 1e-5\n",
+    "\n",
+    "warp_slider.observe(on_slider_change, 'value')\n",
+    "\n",
+    "VBox((warp_slider, Scene([warped_mesh])))"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.8.5"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 4
+}