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cone(gert) Gert cone(gert)

NAME

cone

DESCRIPTION

Cone is a geometry object. It represents a unit cone surface relative to local coordinate system (x^2 + z^2 = y^2). The surface is bounded by planes y = 0 and y = 1, disk x^2 + z^2 <= 1, y = 1 is included (cone is "closed", see also conic object). Since cone is a subclass of assembly, this geometry transforms into an arbitrary elliptical cone surface.

SUPERCLASS

geometry

INSTANCE VARIABLES

face_number is the private instance variable used for ray-cone intersection identification.

MESSAGES

intersect! finds ray-cone intersection.

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

normal! sets the normal to the surface.

row_products! calculates a matrix of pairwise scalar products of scene_to_local_transform. This matrix is used by "normal!" method.

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

EXAMPLE

/* Blue below should be defined as properties objects in GERT, DO NOT CONFUSE with property object in OSCAR. */ cone_1 := cone{ scale= (35,39,45) position=(0,0,15) properties=blue };