我想尝试创建一个半球体。
这是我的代码
void drawHalfSphere(int scaley, int scalex, GLfloat r) {
int i, j;
GLfloat v[scalex*scaley][3];
for (i=0; i<scalex; ++i) {
for (j=0; j<scaley; ++j) {
v[i*scaley+j][0]=r*cos(j*2*M_PI/scaley)*cos(i*M_PI/(2*scalex));
v[i*scaley+j][1]=r*sin(i*M_PI/(2*scalex));
v[i*scaley+j][2]=r*sin(j*2*M_PI/scaley)*cos(i*M_PI/(2*scalex));
}
}
glBegin(GL_QUADS);
for (i=0; i<scalex-1; ++i) {
for (j=0; j<scaley; ++j) {
glVertex3fv(v[i*scaley+j]);
glVertex3fv(v[i*scaley+(j+1)%scaley]);
glVertex3fv(v[(i+1)*scaley+(j+1)%scaley]);
glVertex3fv(v[(i+1)*scaley+j]);
}
}
glEnd();
}
void RenderScene()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity ();
glRotatef(fRotation,1,0,0);
glColor3f(1,0,0);
drawHalfSphere(25.0,25.0,0.5);
glutSwapBuffers();
}
当我旋转半球时,有一个点,球的各个部分消失了。它就像一堵墙,在我旋转球体的后面。