12/17/2023 0 Comments Ray in real life geometryThis is not needed if one does "make map" in root folder.Įxample 2: A Geometrical Hierarchy Look and Feelīefore going further, let us get a look and feel of interacting with the modeller. We first need to load the geometry library. Consider the simplest geometry that is made of a single box. Let us focus on the biggest pack - it is mandatory to define one. In fact, the modeller can act like this, considering a given volume as temporary MARS, but we will describe this feature later on. On the other hand, any volume is a small world by itself - what we need to do is to take it out and to ignore all the rest since it is a self-contained object. We will call these leaves (by analogy with a tree structure). Going on and opening our packs, we will obviously find out some empty ones, otherwise, something is very wrong. We will often call this "master reference system (MARS)". The biggest one containing all others defines the "world" of the model. From outside, the whole thing looks like a big pack that you can open finding out other smaller packs nicely arranged waiting to be opened at their turn. In other words, volumes are put one inside another making an in-depth hierarchy. The difference is just that the relationship between the pieces is not defined by neighbors, but by "containment". These represent the un-positioned pieces of the geometry puzzle. The basic bricks for building-up the model are called "volumes". There are several components gluing together the geometrical model, but for the time being let us get used with the most basic concepts. This chapter will provide a detailed description on how to build valid geometries as well as the ways to optimize them. How to Create a Valid Geometry with Geometry Editors.Finding the Distance to Next Crossed Boundary.Finding the State Corresponding to a Location (x,y,z). Representing Misalignments of the Ideal Geometry.Drawing Volumes and Hierarchies of Volumes.The Normal Vector to the Next Crossed Surface at Crossing Point.Finding the Distance to the Next Boundary.Finding If Current State Is Changed For a New Point.Virtual Containers and Assemblies of Volumes.Example 2: A Geometrical Hierarchy Look and Feel.However, the navigation features provided by the package are designed to optimize particle transport through complex geometries, working in correlation with simulation packages such as GEANT3, GEANT4 and FLUKA. The code works standalone with respect to any tracking Monte-Carlo engine therefore, it does not contain any constraints related to physics. The ROOT geometry package is a tool for building, browsing, navigating and visualizing detector geometries.
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