In Java I create a frustum projection matrix via
Matrix.frustumM(projMatrix, 0, left, right, bottom top, near, far);
and a view matrix via
Matrix.setLookAtM(viewMatrix, 0, 0, 0, -2.5, // eye position 0, 0, 0 // look position 0, -1, 0); // up direction
My question is:
Which part of the frustum originates at the eye position? Is it the tip of the pyramid, or the centre of the near plane?