Camera.main.ScreenToWorldPoint not outputting expected results.

Questions & Answers
1

Hey, this one has been stumping me for a few days now, and I keep avoiding it.

So, I’m trying to do a simple Raycast from mouse position to the world. I’m using:
Physics.Raycast( Camera.main.ScreenToWorldPoint(Input.mousePosition), Camera.main.transform.TransformDirection(Vector3.forward), mouseHitInfo ); //Cast down

Which didn’t seem to be giving me the results I was expecting, so I logged the output, and Camera.main.ScreenToWorldPoint is giving me the same position every single time. (10, 12, 3).

As a note I’m using a camera facing down, on a 30 degree angle. I am calculating that angle in the code above with TransformDirection, so I don’t see the issue…

Any help on the matter is much appreciated, and thanks in advance.

-Rob

2

The reason your code doesn’t work is that Input.mousePosition has a zero Z co-ordinate - i.e. 0 units from the camera, which I’m guessing was at (10,12,3). ScreenPointToRay ignores the Z and produces a Ray from the camera through the screenpoint, which you can then use as a raycast. To understand this, note that the Ray you get from ScreenPointToRay always has its origin at the Camera (it will be (10,12,3) in your case, since that is the line from your eye (the camera) through the mouse position, into the world.