onPointerMove doesnt pick/collide?

Questions
1

Hi!

There is this classic PG where you place stuff by scene.onPointerDown on top of a plane:
https://www.babylonjs-playground.com/index.html#17QBL9#6

if I change it to onPointerMove, i was expecting to move the thing around the plane, but is not workng.
the event gets triggered but it doesnt pick the mesh, see:
https://www.babylonjs-playground.com/index.html#17QBL9#7

any idea why?

thanks for the help!

2

Hi! I am not fully sure why this happens, but I think that you need to launch a ray manually in the onPointerMove callback like that:

 scene.onPointerMove = function (evt, pickResult) {
        console.log("moving")
        console.log(pickResult.hit)
        var pickResult = scene.pick(scene.pointerX, scene.pointerY);

        // if the click hits the ground object, we change the impact position
        if (pickResult.hit) {
            impact.position.x = pickResult.pickedPoint.x;
            impact.position.y = pickResult.pickedPoint.y;
        } else {
			
		}
    };

This will cause some lags though. Maybe only a PointerDown-event will use the scene.pick() in the background and PointerMove does not :thinking:

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3

thats probably it…then the documentation needs an update :slight_smile: according to the documentation…both pointermove and pointer down should work the same

4

Hmm not quite sure, but you are right the doc does not mention this one…

guess we need to study the InputManager to make sure what happens

5

Actually this is because casting a ray on each move can be expensive. So you need to turn it on with:

wall.enablePointerMoveEvents = true;

https://www.babylonjs-playground.com/index.html#17QBL9#8

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