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Interactive Creation of Bodies from Surfaces
Solid bodies can be interactively defined from surfaces by selecting the surfaces that bound a body. There are several modes that are initiated in the From Surfaces submenu of the Bodies Menu. If Sticky Body Create is not checked, a mode is terminated following the creation of a body. Otherwise, the mode remains active. Selecting the Pick Surface toolbar buttonor Pick in the Actions submenus terminates the mode; if the picked surfaces are not cleared, pressing the Pick Cell Surfaces
button twice will do so.
In the RPP mode, an RPP body is created following the picking of 2 PX, 2 PY, and 2 PZ planes.
In the RCC, TRC, REC, SPH mode, a body is created once the surfaces bounding the body are picked. The body type is determined from the surface types. Only aligned cylinders and cones (C/X, C/Y, C/Z, etc.) are recognized. The mode also promotes spheres, ellipsoid, and torus surfaces to bodies.
In the 4 Sided Arb mode, four picked planes define an ARB if they form a closed body. The WED, ARB5 and BOX, ARB6 modes require 5 or 6 planes to be picked. If the planes satisfy the definition of a right angle wedge (WED) or BOX, that body is defined. Otherwise, an ARB is defined if the planes bound a closed region. The program may prompt for a click in the center of the ARB to establish the sense of the ARB with respect to the planes; the cut in which the click is made must pass through the ARB because its depth is used as the third component of the ARB center.
In the Quick RPP, ##C mode, surfaces closest to the click position are used to define a body. If the picked surface is an aligned plane, the nearest planes are used to define an RPP. The algorithm searches for a plane of the same type as the picked plane on the same side of the picked plane as the click. If the picked surface is a cylinder, elliptical cylinder, or cone, the 2 nearest planes perpendicular to the object’s axis in opposite directions from the click bound the body. The mode also promotes spheres, ellipsoid, and torus surfaces to bodies.
 White Rock Science http://www.whiterockscience.com/wrs.html 505 672 1105 |
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