02/21/2002
15-462 Graphics I
26
Curves and Surface in OpenGL
•Central
mechanism is evaluator
•Defined
by array of control points
•Evaluate
coordinates at u (or u and v) to generate vertex
•Define
Bezier curve: type = GL_MAP_VERTEX_3
•Enable
evaluator
•Evaluate
Bezier curve
glMap1f(type,
u0, u1, stride, order, point_array)
glEnable(type)
glEvalCoord1f(u)