Detailed Description

Represents a shape in a scene.

Parameters

shape	This union of shapes represents the possible geometric forms the structure t_shape can assume, i.e., to be a sphere, a plane, a cylinder or a cone. Each shape has its own particular values. The fields below are common properties shared by all types of shape. Each one of them is going to be manipulated (transform, inverse and transpose), be made of some matter (material) and be intersected by rays (intersect and normal_at).
transform	Stores the transformation matrix for the shape.
inverse	Stores the inverse matrix for the shape.
transpose	Stores the transpose matrix for the shape.
material	Stores the material information of the shape.
intersect	Stores the function's name used to calculate the intersection of a ray with the shape.
normal_at	Stores the function's name used to calculate the normal at a point on the shape.