绘制双三次B样条曲面代码
时间: 2023-04-03 18:01:48 浏览: 104
我可以回答这个问题。以下是一个绘制双三次B样条曲面的代码示例:
#include <GL/glut.h>
#include <stdio.h>
GLfloat ctlpoints[4][4][3] = {
{{-1.5, -1.5, 4.}, {-.5, -1.5, 2.}, {.5, -1.5, -1.}, {1.5, -1.5, 2.}},
{{-1.5, -.5, 1.}, {-.5, -.5, 3.}, {.5, -.5, .}, {1.5, -.5, -1.}},
{{-1.5, .5, 4.}, {-.5, .5, .}, {.5, .5, 3.}, {1.5, .5, 4.}},
{{-1.5, 1.5, -2.}, {-.5, 1.5, -2.}, {.5, 1.5, .}, {1.5, 1.5, -1.}}
};
void display(void)
{
int i, j;
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glColor3f(1., 1., 1.);
glPushMatrix();
glRotatef(85., 1., 1., 1.);
for (j = ; j <= 8; j++) {
glBegin(GL_LINE_STRIP);
for (i = ; i <= 30; i++)
glEvalCoord2f((GLfloat)i/30., (GLfloat)j/8.);
glEnd();
glBegin(GL_LINE_STRIP);
for (i = ; i <= 30; i++)
glEvalCoord2f((GLfloat)j/8., (GLfloat)i/30.);
glEnd();
}
glPopMatrix();
glFlush();
}
void init(void)
{
glClearColor(., ., ., .);
glEnable(GL_DEPTH_TEST);
glMap2f(GL_MAP2_VERTEX_3, , 1, 3, 4, , 1, 12, 4, &ctlpoints[][][]);
glEnable(GL_MAP2_VERTEX_3);
glEnable(GL_AUTO_NORMAL);
glMapGrid2f(30, ., 1., 30, ., 1.);
}
void reshape(int w, int h)
{
glViewport(, , (GLsizei)w, (GLsizei)h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
if (w <= h)
glOrtho(-4., 4., -4.*(GLfloat)h/(GLfloat)w,
4.*(GLfloat)h/(GLfloat)w, -4., 4.);
else
glOrtho(-4.*(GLfloat)w/(GLfloat)h,
4.*(GLfloat)w/(GLfloat)h, -4., 4., -4., 4.);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
glutInitWindowSize(500, 500);
glutInitWindowPosition(100, 100);
glutCreateWindow(argv[]);
init();
glutDisplayFunc(display);
glutReshapeFunc(reshape);
glutMainLoop();
return ;
}