[ Identification | Description | Input parameters | Links ]

# The `Union_mesh` Component

Component for including 3D mesh in Union geometry

## Identification

- Site:
- Author: Martin Olsen
- Origin: University of Copenhagen
- Date: 17.09.18

## Description

    Part of the Union components, a set of components that work together and thus
    sperates geometry and physics within McStas.
    The use of this component requires other components to be used.

    1) One specifies a number of processes using process components
    2) These are gathered into material definitions using Union_make_material
    3) Geometries are placed using Union_box/cylinder/sphere, assigned a material
    4) A Union_master component placed after all of the above

    Only in step 4 will any simulation happen, and per default all geometries
    defined before this master, but after the previous will be simulated here.

    There is a dedicated manual available for the Union_components

    The mesh component loads a 3D stl file as the geometry. The mesh geometry
    can not yet be overlapped with the basic geometries (sphere, cylinder, box, cone),
    but can be overlapped with other mesh geometries.

    It is allowed to overlap components, but it is not allowed to have two
    parallel planes that coincides. This will crash the code on run time.

## Input parameters

Parameters in boldface are required; the others are optional.

Name | Unit | Description | Default |
filename | str | Name of stl file that contains the 3D geometry | 0 |
material_string | string | material name of this volume, defined using Union_make_material | 0 |
priority | 1 | priotiry of the volume (can not be the same as another volume) A high priority is on top of low. |  |
visualize | 1 | set to 0 if you wish to hide this geometry in mcdisplay | 1 |
target_index | 1 | Focuses on component a component this many steps further in the component sequence | 0 |
target_x | m |  | 0 |
target_y | m | Position of target to focus at | 0 |
target_z | m |  | 0 |
focus_aw | deg | horiz. angular dimension of a rectangular area | 0 |
focus_ah | deg | vert. angular dimension of a rectangular area | 0 |
focus_xw | m | horiz. dimension of a rectangular area | 0 |
focus_xh | m | vert. dimension of a rectangular area | 0 |
focus_r | m | focusing on circle with this radius | 0 |
p_interact | 1 | probability to interact with this geometry [0-1] | 0 |
mask_string | string | Comma seperated list of geometry names which this geometry should mask | 0 |
mask_setting | string | "All" or "Any", should the masked volume be simulated when the ray is in just one mask, or all. | 0 |
number_of_activations | 1 | Number of subsequent Union_master components that will simulate this geometry | 1 |
init | string | name of Union_init component (typically "init", default) | "init" |

AT ( | , | , |  | ) RELATIVE |  |
ROTATED ( | , | , |  | ) RELATIVE |

## Links

- Source code for `Union_mesh.comp`.

[ Identification | Description | Input parameters | Links ]