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block(gert) Gert block(gert)

NAME

block

DESCRIPTION

Block is a geometry object. It represents a unit cube bounded by planes x = 0, x = 1, y = 0, y = 1, z = 0, and z = 1 relative to local coordinate system. Since block is a subclass of assembly, this geometry transforms into an arbitrary parallelepiped.

SUPERCLASS

geometry

INSTANCE VARIABLES

face_number is the private variable used as index into blocks faces.

MESSAGES

intersect! finds ray-block intersection.

near_far! calculates and returns supporting plane displacement for each of plane_normals.

normal! sets the normal to the surface.

row_products! this method exists for compatibility with other geometry primitives. It does nothing.

transform_bounding_volume! Transforms bounding volume center and radius to the global coordinate system.

EXAMPLE

/* White and blue below should be defined as properties objects in GERT, DO NOT CONFUSE with property object in OSCAR. */ support := block{ scale= (35,39,45) position=(0,0,15) properties=blue }; top := block{ scale=(50,2,75) position=(0,39,0) properties=white }; table :=assembly{ parts=(support, top)

};