How to use new implementation of NURBS?

OpenGL Development JOGL Development
#1

Can someone, please, write short tutorial on using new-implemented NURBS functionality.

Thanks.

#2

You might have a look on the Nurbs demos. (look at http://www.java-gaming.org/forums/index.php?topic=17622.0 to compile).

Here is some code to draw a square using nurbs:



/** Knots used to draw a square with nurbs of degree 2. */
private static final float[] KNOTS_SQUARE = {-1.0f, -1.0f, 1.0f, 1.0f};

	

/** Control points used to draw a square with nurbs of degree 2. */
private static final float[] CP_POINTS_SQUARE = {-1.0f, -1.0f, 0.0f,
                                                 -1.0f, 1.0f, 0.0f,
                                                  1.0f, -1.0f, 0.0f,
                                                  1.0f, 1.0f, 0.0f };

// get the glu object
GLU glu = new GLU();

// create a nurbs object
GLUnurbs nurbsObj = glu.gluNewNurbsRenderer();

// here we will draw a surface
glu.gluBeginSurface(nurbsObj);

// draw the square
glu.gluNurbsSurface(nurbsObj, KNOTS_SQUARE.length, KNOTS_SQUARE, KNOTS_SQUARE.length, KNOTS_SQUARE,
                    2 * 3, 3, CP_POINTS_SQUARE, 2, 2, GL.GL_MAP2_VERTEX_3);


glu.gluEndSurface(nurbsObj);

// gluDeleteNurbsRenderer is not implemented yet(?).
nurbsObj = null;

If you need more information about glu nurbs you might have a look on the glu reference manual:
http://www.opengl.org/documentation/specs/glu/glu1_3.pdf.

Good luck,
Jean-Baptiste