{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# Visualisation of Geometries\n",
"
\n",
"With ROOT you can visualize complex geometries, for example the ones of the LHC experiments or the one of a space station. In this notebook we will read a geometry from a ROOT file and display it. The possibility to save and resume geometries persisted on disk is a powerful feature as it avoids all the complex calculations behind the construction of a geometry from scratch, e.g. from a CAD or XML file. "
]
},
{
"cell_type": "code",
"execution_count": 1,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"%%python\n",
"inputFileName = 'spaceStation.root'\n",
"import os\n",
"if not os.path.exists(inputFileName):\n",
" import urllib2\n",
" response = urllib2.urlopen('https://raw.githubusercontent.com/dpiparo/swanExamples/master/notebooks/Geometry_Visualisation_cpp/spaceStation.root')\n",
" filecontent = response.read() \n",
" with open(inputFileName,\"w\") as f_out:\n",
" f_out.write(filecontent)"
]
},
{
"cell_type": "code",
"execution_count": 2,
"metadata": {
"collapsed": false,
"scrolled": true
},
"outputs": [
{
"name": "stderr",
"output_type": "stream",
"text": [
"Info in : Reading geometry from file: spaceStation.root\n",
"Info in : Geometry loaded from file...\n",
"Info in : Top volume is top. Master volume is top\n",
"Info in : --- Maximum geometry depth set to 100\n",
"Info in : Voxelizing...\n",
"Info in : max level = 1, max placements = 645\n",
"Info in : 0 nodes/ 645 volume UID's in Space Station\n",
"Info in : ----------------modeler ready----------------\n"
]
}
],
"source": [
"TGeoManager::Import(\"spaceStation.root\");\n",
"\n"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"We now get the top volume of the geometry to which all volumes are attached and draw it. The visualisation is interactive Rotate and zoom it with your mouse!\n"
]
},
{
"cell_type": "code",
"execution_count": 3,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stderr",
"output_type": "stream",
"text": [
"Info in : created default TCanvas with name c1\n"
]
},
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],
"source": [
"auto topVolume = gGeoManager->GetTopVolume();\n",
"topVolume->Draw();"
]
}
],
"metadata": {
"kernelspec": {
"display_name": "ROOT C++",
"language": "c++",
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