Question

I have a 3d object which I want to keep in the center of my view. If I were to translate the object I want the camera to move with it and keep the object in the center of the screen. How would I do this with opengl and libgdx?

Answer 1

gluLookAt will do what you want.

pseudocode:

float objPos[3];
float camPos[3] = objPos - float[3]{0, 0, 3} //camera 3 units behind object on Z axis
float upVec[3] = { 0, 1, 0}

onDraw {
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    gluLookAt(camPos[0], camPos[1], camPos[2], objPos[0], objPos[1], objPos[2], upVec[0], upVec[1], upVec[2]);

    ...draw...
}