在此代码中,我尝试绘制立方体。我尝试绘制所有面逆时针顶点。
问题是,如果我不旋转立方体只绘制红色的脸部,如果我旋转它的5度,我只看到立方体的一部分。绘制一个立方体并旋转它:立方体的一部分消失
#import <OpenGL/OpenGL.h>
#import <GLUT/GLUT.h>
int width=500, height=500, depth=500;
void init()
{
glEnable(GL_DEPTH_TEST);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(200, 200,-200, 200, 200, 0, 0, 1, 0);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(0,width,0,height);
gluPerspective(90, 1, -100, 100);
glViewport(0, 0, width, height);
}
void drawCube()
{
int vertices[8][3]= { {100,100,0} , {300,100,0}, {300,300,0}, {100,300,0}, {100,100,300} , {300,100,300}, {300,300,300}, {100,300,300} };
glBegin(GL_QUADS);
glColor4f(1, 0, 0, 0);
glVertex3iv(vertices[0]);
glVertex3iv(vertices[1]);
glVertex3iv(vertices[2]);
glVertex3iv(vertices[3]);
glVertex3iv(vertices[4]);
glVertex3iv(vertices[5]);
glVertex3iv(vertices[6]);
glVertex3iv(vertices[7]);
glColor4f(0, 1, 0, 0);
glVertex3iv(vertices[1]);
glVertex3iv(vertices[5]);
glVertex3iv(vertices[6]);
glVertex3iv(vertices[4]);
glVertex3iv(vertices[0]);
glVertex3iv(vertices[4]);
glVertex3iv(vertices[7]);
glVertex3iv(vertices[3]);
glColor4f(0, 0, 1, 0);
glVertex3iv(vertices[3]);
glVertex3iv(vertices[2]);
glVertex3iv(vertices[6]);
glVertex3iv(vertices[7]);
glVertex3iv(vertices[0]);
glVertex3iv(vertices[1]);
glVertex3iv(vertices[5]);
glVertex3iv(vertices[4]);
glEnd();
}
void display()
{
glClearColor(0.0, 0.0, 0.0, 0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(200,200,150);
glRotatef(5, 0, 1, 0);
glTranslatef(-200,-200,-150);
drawCube();
glutSwapBuffers();
}
void idle(void)
{
}
int main(int argc, char * argv[])
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
glutInitWindowPosition(100, 100);
glutInitWindowSize(width, height);
glutCreateWindow("Test");
glutDisplayFunc(display);
glutIdleFunc(idle);
init();
glutMainLoop();
return 0;
}
这是我所看到的:
不过我应该会看到一个旋转立方,所以我应该看到在right.My怀疑另一面的部分是我以逆时针顺序绘制顶点或其他东西时会出错。
PS:代码已过时,因为在我的大学我没有可能学习最新版本的OpenGL,我必须使用GLUT。
一切都好,除了我现在只能用正投影而不是预测投影。 gluPerspective的值我试图是45,1,1,1000,我没有看到窗口中的立方体。 –