Picking with the mouse

Troubleshooting General Help
1

I’m trying to figure out how to use the mouse to pick an object in jME3. The sample uses the center of the viewport to determine the pick ray, but I want to be able to point and click with the mouse. The getXAbsolute() and getYAbsolute() methods seem to be gone in jME3. I’ve been through a lot of docs and forum posts, but I still can’t find the right methods to get the 2D mouse coordinates and translate them into a pick ray into the 3D world.



Can anyone help with this, please?



Thanks,

Lee

2

Hello Picking can help you

3

Thanks for your reply, rickard, but that was the example I was referring to. It uses the center of the viewport (based on the camera) to determine the pick ray:



[java]Ray ray = new Ray(cam.getLocation(), cam.getDirection());[/java]



I want to use a mouse click to create that ray, but I’m not sure how.

4

Sorry. I guess i didn’t read your post properly.



You use the inputmanager’s getCursorPosition() to get the mouse position.



There’s a good example in the test/collision folder, called TestMousePick

5

Hello!



[java]

Vector2f mouseCoords = new Vector2f(inputManager.getCursorPosition());

// System.out.println(mouseCoords);

mouseRay = new Ray(cam.getWorldCoordinates(mouseCoords, 0),

cam.getWorldCoordinates(mouseCoords, 1).subtractLocal(

cam.getWorldCoordinates(mouseCoords, 0)).normalizeLocal());

[/java]



Is the code I use all over in my code to get the screen position of the mouse and fire a ray. Your mileage may vary. Make sure you call MouseInput.setCursorVisible(true), to get the cursor on your screen.



~FlaH

1 Like
6

Take a look at TestMousePick in the JmeTests. That should solve your problems.

7
tehflah said:
Hello!

[java]
Vector2f mouseCoords = new Vector2f(inputManager.getCursorPosition());
// System.out.println(mouseCoords);
mouseRay = new Ray(cam.getWorldCoordinates(mouseCoords, 0),
cam.getWorldCoordinates(mouseCoords, 1).subtractLocal(
cam.getWorldCoordinates(mouseCoords, 0)).normalizeLocal());
[/java]

Is the code I use all over in my code to get the screen position of the mouse and fire a ray. Your mileage may vary. Make sure you call MouseInput.setCursorVisible(true), to get the cursor on your screen.

~FlaH

YaY! I was doing something similar but I was tracking the mouse with a RawInputListener