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6.9

OpenGL gluLookAt: Two camera questions

Asked by AntonKarlsson in OpenGL Graphics & Game Programming

Tags: opengl glulookat up vector roll angle

Now I finally understands how gluLookAt works. I just need the camera position(eye) the viewing target(focal point(center)) and roll(for the up vector) in my View class. And calculate the view direction for the up vector.

So my first question is how do I calculate the up vector from the viewing direction vector and camera/view roll?

And two how do I call the gluLookAt and place all scene-objects locations(with the basic gl translation functions)? And when to call glLoadIdentity()?
 
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Tags: opengl glulookat up vector roll angle
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