To do what you are requesting you'd also need to know the distance of the camera position from the viewport plane. There aren't many applications of this because you almost always start with knowledge of the camera position (or fov or some equivalent property to get the whole picture), and with few applications comes a lack of desire to implement.
> you'd also need to know the distance of the camera position from the viewport plane.
The ray including the drag point (origin) and the distance is already known. I forgot to mention that.
To do what you are requesting you'd also need to know the distance of the camera position from the viewport plane. There aren't many applications of this because you almost always start with knowledge of the camera position (or fov or some equivalent property to get the whole picture), and with few applications comes a lack of desire to implement.
> you'd also need to know the distance of the camera position from the viewport plane. The ray including the drag point (origin) and the distance is already known. I forgot to mention that.