Creating csGeoSet Objects
17
Each class has methods that allow you to set and retrieve the values necessary to define
the geometry, including (where appropriate)
• coordinates of the center
• length of the radius
• height
• width
The names of the methods that set and retrieve these values are intuitively obvious, for
example, to set and retrieve the coordinates of the center of a geometry, you use methods
similar to the following:
void setCenter(const csVec3f& center);
void getCenter(csVec3f& center);
Creating csGeoSet Objects
csGeoSet is a virtual class from which all geometric primitives are derived. Each
csGeoSet-derived class contains a collection of primitives, such as points, quads, or
triangle strips. All of the primitives in a collection are of the same type. You can construct
a geometric object by specifying the coordinates of several of these primitives and
combine them in a collection. For example, you can arrange triangles to form a sphere or
a landscape. The vertices, normals, colors, and texture coordinates of each primitive are
captured as attributes of each primitive.
Figure 2-1 illustrates how:
• Each csGeoSet-derived object contains an array of primitive shapes.
• Each primitive is made of an array of four attributes.
• Each of the four attributes refers to an array of attribute values, as shown in
Figure 2-1.
Note: The order of the attributes can be changed depending on the needs of the
application.
