Screen to world

[Numa]

Hi there, 

I believe that's how you go from world to screen coordinates:

var screenPoint = BABYLON.Vector3.Project(worldPoint, 
            BABYLON.Matrix.Identity(), 
            scene.getTransformMatrix(), 
            camera.viewport.toGlobal(engine));

To go from screen to world I found the Unproject function, is there any example of how to use it? And do those functions take the camera radius into account?

[Kesshi]

You can have a look at Scene.createPickingRay(). Its basicly a screen to wolrd transformation.
Here is the code:
https://github.com/BabylonJS/Babylon.js/blob/master/src/babylon.scene.ts#L2479

At the end Ray.CreateNew() is used which uses the unproject function:
https://github.com/BabylonJS/Babylon.js/blob/master/src/Culling/babylon.ray.ts#L282

[Numa]

Ok thanks I'll have a look!

[FlashyGoblin]

Here is an example of getting the 3D position of your scene from where you click your mouse on the canvas area. Hope it helps.

canvas.addEventListener("pointerdown", function (evt) {
    
    var pickResult = scene.pick(evt.clientX, evt.clientY, function (mesh) {
        return mesh;
    });
    
    if (pickResult.hit) {
        console.debug("3D position", pickResult.pickedPoint);
    }
    
}, false);

 

[Numa]

It looks like sprites don't get hit by rays?

(open console to see logs)

http://www.babylonjs-playground.com/#EVYAT

 

edit: I found pickSprite but it doesn't return the hit point hehe. 

 

All I want to do is draw a line from a point on a sprite to the center of the scene. How do I get that point on the sprite converted to the 3d world? I've got a feeling I'm missing something really obvious.

[iiceman]

Hi there,

you can use pickResult.pickedSprite.position, but since the sprites are always squares it looks a bit weird. Maybe you are better of with using planes?

http://www.babylonjs-playground.com/#EVYAT#1

[GameMonetize]

You are not forced to have squared sprites: http://www.babylonjs-playground.com/#EVYAT#2

[Numa]

 

2 hours ago, Deltakosh said:

You are not forced to have squared sprites: http://www.babylonjs-playground.com/#EVYAT#2

  !!!!!!!!!

that's what I meant by " I've got a feeling I'm missing something really obvious" ahah :facepalm: :facepalm:

THANK YOU!

[GameMonetize]

No problem, this is why we have a forum