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TABSF Decomposition
The TABSF body is decomposed into planes, cylinders, and cones and, optionally, into solid bodies. An RCC or RPP bounding body can be placed around the TABSF. The bounding body simplifies descriptions of space exterior to the TABSF. Three types of cells are defined from a TABSF. Body cells are inside the TABSF body (red in the upper figure), hole cells (black) are in the interior space, and outside cells (yellow) are between the TABSF and its bounding body. Outside cells are not created if there is no bounding body.
Either multiple simple cells can be defined from a TABSF or a single cell consisting of a union of the simple shapes. We recommend using multiple simple cells for better Monte Carlo performance. The lower figure shows multiple cells with distinct colors. Hole and outside cells are not generated with the single cell option.
The decomposition, cell generation, and bounding body options are set on the TABSF Cells property page. The page contains fields to set the materials for body, hole, and outside cells. 2D and 3D visibility, 3D style (solid or wireframe), and whether or not to use the same color for cells of the same type can be set by cell type. The left panel of Figure 5 shows multiple cells using the Same Color option.
The TABSF Cells property page contains an Additional Cell Description Items field. Signed surface or body numbers here are appended to the descriptions of all cells generated from the TABSF. If the additional items affect only a few cells, it is more efficient, for transport purposes, to directly modify those cells than to apply the additional items to all the cells. We plan to implement the ability to generate a different set of cells from the same TABSF using a different set of additional items.
After a TABSF is modified, either interactively or on the TABSF Body property page, new composition surfaces (and bodies body decomposition is in effect) are created and new cells are generated if cells were initially present. Existing surfaces, bodies, and cells are destroyed if they are not used in the description of an object not part of the decomposition. We recommend delaying cell creation until all definition and editing of the TABSF has been finished; in most cases, editing with cells present should lead to expected results.
 White Rock Science http://www.whiterockscience.com/wrs.html 505 672 1105 |
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