Get camera view

[Hersir]

Hi,

have a question, is it possible to get coordinates in 3d space of arcRotatinCamera (width, height and leftTop corner vector) of visible area ?

I need to zoom on area and than move out all not needed objects out of camera view and align mesh to topRight corner of visible area

[Wingnut]

Hiya Hersir.  This probably isn't a good answer, but look at this...

https://www.babylonjs-playground.com/#ACVZF0#0

Lines 67-82.  TL, BL, TR, BR... those are corner vectors, I think.

Anyway, that's something to play-with.  It was found via playground search for 'frustum'.  Hope this helps.  Stay tuned for others.

[Hersir]

@Wingnut Thanks will check that, tried to go a bit different way but also stuck there

const v = Vector3.Unproject(
            new Vector3(0 ,0 , 0),
            viewport.width,
            viewport.height,
            Matrix.Identity(),
            cam.getViewMatrix(true),
            cam.getProjectionMatrix(true),
);

Tried to convert 2d 0,0 point to 3d in camera to get left corner but it didn't worked out well,  just got centre point

[Hersir]

for now did this

const leftTop = this.getScene().pick(0, 0, undefined, false, cam).pickedPoint;
const leftBottom = this.getScene().pick(0, viewport.height, undefined, false, cam).pickedPoint;
const rightTop = this.getScene().pick(viewport.width, 0, undefined, false, cam).pickedPoint;
const rightBottom = this.getScene().pick(viewport.width, 0, undefined, false, cam).pickedPoint;

 

[Sebavan]

Here is the code used internally to compute the frustum planes if that helps.

https://github.com/sebavan/Babylon.js/blob/master/src/Cameras/babylon.camera.ts#L530