Problems with control points of OpenGL bezier or nurbs surface (one hundred thousand rush)

gjpro1981

At present, all the surface examples in books and on the Internet only have 4x4 control points. I extended it to 8x8 control points, which can draw the surface normally. However, it cannot be displayed if it reaches 10x10 or more. Is there a limit to the number of control points? But software like 3dsmax can insert countless control points. I need a surface to build a human body model. 8x8 control points are definitely not enough. Please see the code:

/ * Control point * /
GLfloat ctrlpoints [8] [8] [3] = {

/ * Call the 2D evaluation program * /
glMap2f (GL_MAP2_VERTEX_3, 0, 1, 3, 8, 0, 1, 24, 8,&ctrlpoints [0] [0] [0]);
GlEnable (GL_MAP2_VERTEX_3);

/* evaluate */
For (j = 0; j <= 8; j ++)
{
GlBegin (GL_LINE_STRIP);
For (i = 0; i <= 30; i ++)
GlEvalCoord2f ((GLfloat) i / 30.0, (GLfloat) j / 8.0);
GlEnd ();
        }

There is no problem with the bezier surface drawn in this way, but when I change 8 to 10 or more, I can't draw it.

/ * Control point * /
GLfloat ctrlpoints [10] [10] [3] = {

/ * Call the 2D evaluation program * /
glMap2f (GL_MAP2_VERTEX_3, 0, 1, 3, 10, 0, 1, 30, 10,&ctrlpoints [0] [0] [0]);
GlEnable (GL_MAP2_VERTEX_3);

/* evaluate */
For (j = 0; j <= 8; j ++)
{
GlBegin (GL_LINE_STRIP);
For (i = 0; i <= 30; i ++)
GlEvalCoord2f ((GLfloat) i / 30.0, (GLfloat) j / 8.0);
GlEnd ();
        }

Did I confuse control points, nodes, and order? So, what if you want to draw a bezier or nurbs surface with hundreds of control points? It is best to give the source code. Many thanks!

rsq666

for (j = 0; j <= 10; j ++)
{
GlBegin (GL_LINE_STRIP);
For (i = 0; i <= 30; i ++)
GlEvalCoord2f ((GLfloat) i / 30.0, (GLfloat) j / 10.0);
GlEnd ();
        }
Try it.

gjpro1981

rsq666
Not useful, glEvalCoord2f ((GLfloat) i / 30.0, (GLfloat) j / 10.0); this has nothing to do with control points, it is just a matter of how many grids to divide.