cam_pos      = [0.494752, 1.50074, 0.302512]';
cam_dir      = [-0.582511, 0.447225, -0.678728]';
cam_up       = [0.592053, 0.80558, 0.0226862]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.740697, 0.516875, 0.976272]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;