Hi. Some days ago a started getting familiar with openGL. My problem so far: I just want to draw a simple line on the Y-axis with this code:
glBegin(GL_LINES);
glVertex3f(0, 10, 0);
glVertex3f(0, -10, 0);
glEnd
;
but unfortunately when rendering, i got no line, but instead a triangle on its position (the big sphere in the middle is placed on 0,0,0 / center):
the main() and rendering() code so far:
void renderScene(void) {
if (deltaMove) {
computePos(deltaMove);
}
// Clear Color and Depth Buffers
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
// Reset transformations
glLoadIdentity();
// Set the camera
gluLookAt(x, y, z,
x + lx, y + ly, z + lz,
0.0f, 1.0f, 0.0f);
// Draw a Line
glBegin(GL_LINES);
glVertex3f(0, 10, 0);
glVertex3f(0, -10, 0);
glEnd;
// glPopMatrix();
// Draw "Stars"
for (int i = 0; i < lstVectors.size(); i++) {
glPushMatrix();
glTranslatef(lstVectors.at(i)->GetX(), lstVectors.at(i)->GetY(), lstVectors.at(i)->GetZ());
drawSphere();
glPopMatrix();
}
glutSwapBuffers();
}
int main(int argc, char **argv) {
// initVektors();
LoadStars();
// init GLUT and create window
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA);
glutInitWindowPosition(100, 100);
glutInitWindowSize(640, 480);
glutCreateWindow("Star GL");
// register callbacks
glutDisplayFunc(renderScene);
glutReshapeFunc(changeSize);
glutIdleFunc(renderScene);
glutIgnoreKeyRepeat(1);
glutKeyboardFunc(keyboard);
glutSpecialFunc(pressKey);
glutSpecialUpFunc(releaseKey);
// here are the two new functions
glutMouseFunc(mouseButton);
glutMotionFunc(mouseMove);
// OpenGL init
glEnable(GL_DEPTH_TEST);
// enter GLUT event processing cycle
glutMainLoop();
return 1;
}
…anyone can tell me how i get real lines? 