Exactly what the title says. If I pass [0,0,0] into cv2.projectPoints() as rvec, whats the orientation? What direction is it facing?

CodePudding user response：

A rotation vector's length encodes the amount of rotation in radians.

A vector of length 0 encodes a rotation of nothing at all.

Such a "rotation" has no unique axis. It's an identity transformation.

the rvec argument to cv::projectPoints() does not represent a camera angle/orientation. It represents the orientation of the model points, at the model's position. The tvec positions the model's points in front of the camera.

If your points are already relative to the camera's coordinate frame, then you must use zero rotation and zero translation.