我有一个创建 3D 模型并从中导出图像的应用程序。我用这个例子来做到这一点：
#include <windows.h>
#include <GL\GL.h>
#include <GL\glu.h>
#include <GL\glut.h>
#include <opencv2\highgui.hpp>
GLfloat light_diffuse[] = { 1.0, 0.0, 0.0, 1.0 }; /* Red diffuse light. */
GLfloat light_position[] = { 1.0, 1.0, 1.0, 0.0 }; /* Infinite light location. */
GLfloat n[6][3] = { /* Normals for the 6 faces of a cube. */
{ -1.0, 0.0, 0.0 },{ 0.0, 1.0, 0.0 },{ 1.0, 0.0, 0.0 },
{ 0.0, -1.0, 0.0 },{ 0.0, 0.0, 1.0 },{ 0.0, 0.0, -1.0 } };
GLint faces[6][4] = { /* Vertex indices for the 6 faces of a cube. */
{ 0, 1, 2, 3 },{ 3, 2, 6, 7 },{ 7, 6, 5, 4 },
{ 4, 5, 1, 0 },{ 5, 6, 2, 1 },{ 7, 4, 0, 3 } };
GLfloat v[8][3]; /* Will be filled in with X,Y,Z vertexes. */
void drawBox(void)
{
int i;
for (i = 0; i < 6; i++) {
glBegin(GL_QUADS);
glNormal3fv(&n[i][0]);
glVertex3fv(&v[faces[i][0]][0]);
glVertex3fv(&v[faces[i][1]][0]);
glVertex3fv(&v[faces[i][2]][0]);
glVertex3fv(&v[faces[i][3]][0]);
glEnd();
}
}
void display(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
drawBox();
glFlush();
}
void init(void)
{
/* Setup cube vertex data. */
v[0][0] = v[1][0] = v[2][0] = v[3][0] = -1;
v[4][0] = v[5][0] = v[6][0] = v[7][0] = 1;
v[0][1] = v[1][1] = v[4][1] = v[5][1] = -1;
v[2][1] = v[3][1] = v[6][1] = v[7][1] = 1;
v[0][2] = v[3][2] = v[4][2] = v[7][2] = 1;
v[1][2] = v[2][2] = v[5][2] = v[6][2] = -1;
/* Enable a single OpenGL light. */
glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
glLightfv(GL_LIGHT0, GL_POSITION, light_position);
glEnable(GL_LIGHT0);
glEnable(GL_LIGHTING);
/* Use depth buffering for hidden surface elimination. */
glEnable(GL_DEPTH_TEST);
/* Setup the view of the cube. */
glMatrixMode(GL_PROJECTION);
gluPerspective( /* field of view in degree */ 40.0,
/* aspect ratio */ 1.0,
/* Z near */ 1.0, /* Z far */ 10.0);
glMatrixMode(GL_MODELVIEW);
gluLookAt(0.0, 0.0, 5.0, /* eye is at (0,0,5) */
0.0, 0.0, 0.0, /* center is at (0,0,0) */
0.0, 1.0, 0.); /* up is in positive Y direction */
/* Adjust cube position to be asthetic angle. */
glTranslatef(0.0, 0.0, -1.0);
glRotatef(60, 1.0, 0.0, 0.0);
glRotatef(-20, 0.0, 0.0, 1.0);
}
int main(int argc, char **argv)
{
int width = 500, height = 500;
/********* i want to remove this section ************/
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
glutCreateWindow("red 3D lighted cube");
/********* i want to remove this section ************/
init();
display();
BYTE* result = new BYTE[3 * width *height];
glReadPixels(0, 0, width, height, GL_RGB, GL_UNSIGNED_BYTE, result);
cv::Mat img(width, height, CV_8UC3);
img.data = result;
cv::flip(img, img, 0);
cv::imwrite("D:\\result_off.jpg", img);
return 0; /* ANSI C requires main to return int. */
}
它确实正确，但是当我运行该程序时，它会创建一个窗口并显示它然后将其删除。
我试图删除 glut* 函数并运行我的程序，但运行时它没有导出任何内容。我用谷歌搜索，发现我应该使用 Framebuffer 但我找不到任何例子。
如何设置我的程序在渲染 3D 模型时不显示任何窗口？
注意：我想在 Windows 和 Linux 上运行这个程序。