3D Camera
float eyeX = width/2.0;
float eyeY = height/2.0;
float eyeZ =(height/2.0) / tan(PI*30.0 / 180.0);
float centerX = width/2.0;
float centerY = height/2.0;
float centerZ = 0;
float upX = 0;
float upY = 1;
float upZ = 0;
camera(eyeX, eyeY, eyeZ, centerX, centerY, centerZ, upX, upY, upZ);