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void SubBackview()
{
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(1.0f, 0.0f, 0.0f);
glBegin(GL_POLYGON);
glVertex3f(-0.5f, -0.5f, 0.0f);
glVertex3f(0.5f, -0.5f, 0.0f);
glVertex3f(0.5f, 0.5f, 0.0f);
glVertex3f(-0.5f, 0.5f, 0.0f);
glEnd();
glFlush();
void SubBackview()
{
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(1.0f, 0.0f, 0.0f);
glBegin(GL_POLYGON);
glVertex3f(-0.5f, -0.5f, 0.0f);
glVertex3f(0.5f, -0.5f, 0.0f);
glVertex3f(0.5f, 0.5f, 0.0f);
glVertex3f(-0.5f, 0.5f, 0.0f);
glEnd();
glFlush();