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Oculus Rift Hints

With this code snipped you get the transformation matrix to get your eye direction. 

// get the data of head tracking sensor
PVector orientation = new PVector();
// x = yaw , y = pitch , z = roll
oculusRiftDev.sensorOrientation(orientation);

mat = new PMatrix3D();
mat.rotateY(orientation.x);
mat.rotateX(orientation.y);
mat.rotateZ(orientation.z);
mat.translate(0,0,-3);

// sphere
stroke(100,0,0);
pushMatrix();
applyMatrix(mat);
sphere(1);
popMatrix();