I want to do the 3D-picking on OpenGl by the way of frame pick. On this way I need to use glReadPixel to get some information of the pixels on the screen currently, so I test it on the following way ...

Basically I have a local space where y points down and x points right, like | | ---------> +x | | +y and the center is at (320, 240), so the upper left corner is (0,0...

Mostly all answers I've found involve multiplying a vector of normalised device coordinates by a inverse(projection * view) matrix, however every example I've tried results in at least two invalid thi...

So I'm making this FPS game where I want to move forward, backward, left and right with keyboard input and look around with the camera like in a real FPS-game like Battlefield. The camera movement in ...