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[ Identification | Description | Input parameters | Links ]
The Filter Component
Release: McXtrace 1.1
Block of an attenuating material
Identification
- Author: Erik Knudsen
- Origin: DTU Physics
- Date: Jan 24, 2011
Description
A chunk of attenuating material. Attenuation is computed through the effective length travelled within the material. No scattering is modelled at present. Filter shape may be a cylinder, a sphere, a box or any other shape. box/plate: xwidth x yheight x zdepth cylinder: radius x yheight (along Y axis) sphere: radius any shape: geometry=OFF/PLY_file Example: Filter(material_datafile="Ge.txt", geometry="wire.ply",xwidth=0.02,yheight=0,zdepth=0) Example: Filter(material_datafile="Ge.txt",xwidth=0.02,yheight=0.02, zdepth=1e-4) Example: Filter(material_datafile="Ge.txt",radius=1e-4,yheight=0.02) Example: Filter(material_datafile="Ge.txt",radius=1e-3, refraction=1)
Input parameters
Parameters in boldface are required; the others are optional.| Name | Unit | Description | Default | |
| refraction | 0/1 | If nonzero, refraction is enabled. (Only functional for basic geometries, does not yet work for OFF) | 0 | |
| fixed_delta | 0/1 | Use a fixed delta to compute refraction - useful for debugging. | 0 | |
| material_datafile | str | File where the material parameters for the filter may be found. Format is similar to what may be found off the NIST website. [Be.txt] | "Be.txt" | |
| geometry | str | File containing the polygon definition of a general shape object. When xwidth is also given, the object is rescaled accordingly (OFF/PLY) | 0 | |
| xwidth | m | Width of block. | 0 | |
| yheight | m | Height of block. | 0 | |
| zdepth | m | Thickness of block. | 0 | |
| radius | m | Radius of cylinder or sphere. | 0 | |
| mu_col | idx | Column index to pick up absorption length mu, counted from 0. Use with non-standard input file, e.g. 2-3 column files. -1 means attempt autodetect. | -1 |
| AT ( | , | , | ) RELATIVE | |||
|---|---|---|---|---|---|---|
| ROTATED ( | , | , | ) RELATIVE |
Links
- Source code for
Filter.comp. - Meshlab - viewer for OFF files
- Geomview and Object File Format (OFF) - OFF file definition and examples
- jroff.jar - Java version of Geomview (display only)
- Qhull - for calculating a convex hull from points.
- Powercrust - for reconstructing a solid geometry from a point cloud.
- Most material datafile inpus may obtained from NIST FFast
[ Identification | Description | Examples | Input parameters | Links ]
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