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/*******************************************************************************
*
* McStas, neutron ray-tracing package
* Copyright (C) 1997-2008, All rights reserved
* Risoe National Laboratory, Roskilde, Denmark
* Institut Laue Langevin, Grenoble, France
*
* Component: Shape
*
* %I
* Written by: E. Farhi
* Date: June 23rd 2009
* Origin: ILL
* Modified by: E. Farhi, based on Incoherent
*
* A geometric shape without effect on neutron, for instrument display purpose.
*
* %D
* An inactive geometrical shape, for drawing purposes only.
* It does not propagate neutron, nor interact.
* <b>Shape:</b>
* Geometric shape may be a cylinder, a sphere, a box or any other shape
* box/plate: xwidth x yheight x zdepth (thickness=0)
* hollow box/plate:xwidth x yheight x zdepth and thickness>0
* cylinder: radius x yheight (thickness=0)
* hollow cylinder: radius x yheight and thickness>0
* sphere: radius (yheight=0 thickness=0)
* hollow sphere: radius and thickness>0 (yheight=0)
* any shape: geometry=OFF file
*
* The complex geometry option handles any closed non-convex polyhedra.
* It computes the intersection points of the neutron ray with the object
* transparently, so that it can be used like a regular sample object.
* It supports the OFF and NOFF file format but not COFF (colored faces).
* Such files may be generated from XYZ data using qhull/powercrust, and
* viewed with geomview
* The default size of the object depends of the OFF file data, but its
* bounding box may be resized using xwidth,yheight and zdepth.
*
* Example: Shape(radius=0.05, yheight=0.1)
* Shape(geometry="socket.off")
*
* %P
* INPUT PARAMETERS:
* radius: [m] Outer radius of sample in (x,z) plane
* xwidth: [m] Horiz. dimension of sample (bounding box if off file), as a width
* yheight: [m] Vert. dimension of sample (bounding box if off file), as a height. A sphere shape is used when 0 and radius is set
* zdepth: [m] Depth of sample (bounding box if off file)
* thickness: [m] Thickness of hollow sample
* geometry: [str] Name of an Object File Format (OFF) file for complex geometry. The OFF file may be generated from XYZ coordinates using qhull/powercrust
* center: [1] Flag to determine if OFF object is centered on its centre of mass.
*
* %L
* Geomview and Object File Format (OFF) <http|://www.geomview.org>
* %L
* Powercrust/qhull <http://www.cs.utexas.edu/users/amenta/powercrust>
*
* %E
*******************************************************************************/
DEFINE COMPONENT Shape
SETTING PARAMETERS (string geometry=0, radius=0, xwidth=0, yheight=0, zdepth=0, thickness=0, nx=0, ny=1, nz=0, int center=1)
/* Neutron parameters: (x,y,z,vx,vy,vz,t,sx,sy,sz,p) */
SHARE
%{
%include "read_table-lib"
%include "interoff-lib"
%}
DECLARE
%{
off_struct offdata;
%}
INITIALIZE
%{
if (geometry && strlen(geometry) && strcmp(geometry, "NULL") && strcmp(geometry, "0")) {
if (off_init(geometry, xwidth, yheight, zdepth, !center, &offdata)) {
thickness=0;
}
}
%}
TRACE %{
/* component Shape does nothing */
%}
MCDISPLAY COPY Incoherent
END
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