#include <stdlib.h> #include <GL/glut.h> GLfloat ctrlpoints[4][4][3] = { {{-1.5, -1.5, 4.0}, {-0.5, -1.5, 2.0}, {0.5, -1.5, -1.0}, {1.5, -1.5, 2.0}}, {{-1.5, -0.5, 1.0}, {-0.5, -0.5, 3.0}, {0.5, -0.5, 0.0}, {1.5, -0.5, -1.0}}, {{-1.5, 0.5, 4.0}, {-0.5, 0.5, 0.0}, {0.5, 0.5, 3.0}, {1.5, 0.5, 4.0}}, {{-1.5, 1.5, -2.0}, {-0.5, 1.5, -2.0}, {0.5, 1.5, 0.0}, {1.5, 1.5, -1.0}} }; void init(void) { glClearColor (0.0, 0.0, 0.0, 0.0); glMap2f(GL_MAP2_VERTEX_3, 0, 1, 3, 4, 0, 1, 12, 4, &ctrlpoints[0][0][0]); glEnable(GL_MAP2_VERTEX_3); glMatrixMode(GL_PROJECTION); glLoadIdentity(); glOrtho(-8.0, 8.0, -6.0, 6.0, -5.0, 5.0); glMatrixMode(GL_MODELVIEW); } void display(void) { int i, j; glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glColor3f(1.0, 1.0, 1.0); glLoadIdentity(); glRotatef(60.0, 1.0, 1.0, 1.0); 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(); glBegin(GL_LINE_STRIP); for (i = 0; i <= 30; i++) glEvalCoord2f((GLfloat)j/8.0, (GLfloat)i/30.0); glEnd(); } glFlush(); } int main(int argc, char** argv) { glutInit(&argc, argv); glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH); glutInitWindowSize (800, 600); glutInitWindowPosition (0,0); glutCreateWindow ("bezier-surface"); init (); glutDisplayFunc(display); glutMainLoop(); return 0; }