COPYEVAL(nged)

copyeval - Creates a new primitive object called new_ primitiveby applying the transformation matrices accumulated along the path_to_old_primitive to the leaf primitive shape object at the end of the path and saving the result under the name new_ primitive.

copyeval {new_primitive path_to_old_primitive}

Objects in a BRL-CAD model are stored as Boolean trees (combinations), with the members being primitive shapes or other Boolean trees. Each member has a transformation matrix associated with it. This arrangement allows a primitive to be a member of a combination, and that combination may be a member of another combination, and so on. When a combination is displayed, the transformation matrices are applied to its members and passed down through the combinations to the leaf (primitive shape) level. The accumulated transformation matrix is then applied to the primitive before it is drawn on the screen. The copyeval command creates a new primitive object called new primitive_ by applying the transformation matrices accumulated along the path_to_old_primitive to the leaf primitive shape object at the end of the path and saving the result under the name new_primitive. The path_to_old_primitive must be a legitimate path ending with a primitive shape.

The example shows the use of the copyeval command to create a new primitive by applying the transformation matrices along the path to the old primitive.

BRL-CAD Team

This software is Copyright (c) 1989-2021 by the United States Government as represented by U.S. Army Research Laboratory.

Reports of bugs or problems should be submitted via electronic mail to devs@brlcad.org