Camera.computeViewRectangle give false rectangle in australia

CesiumJS
1

Hello,
I’m using camera computeViewRectangle method.It run properly nearly everywhere. But When I’m looking to avustralia (or near locations )and save cameraviewrectangle and later when I try to fly to this rectangle with it fly to other region like africa.

I’m modified viewRectangle sandcastle to show faulty result .

function viewRectangle() {

Sandcastle.declare(viewRectangle);

var west = -3.1415926;

var south =-1.57079;

var east = 3.1415926;

var north = 1.57079;

var rect=scene.camera.computeViewRectangle(viewer.scene.globe.ellipsoid);

var rectangle = Cesium.Rectangle.fromDegrees(west, south, east, north);

viewer.camera.flyTo({

destination: rect,

duration:3

});

console.log(rect);

// Show the rectangle. Not required; just for show.

viewer.entities.add({

rectangle : {

coordinates : rect,

fill : false,

outline : true,

outlineColor : Cesium.Color.WHITE

}

});

}

If you are try view rectangle choice when looking australia. You can see faulty result and faulty rectangle drawwing.

This error can be solve. Is it a bug or my fault.

Thanks .

Esra ERİK

2

Hello,

I wasn’t able to reproduce the error you were seeing. Here is the example I tested with:

var viewer = new Cesium.Viewer(‘cesiumContainer’);
var west = -3.1415926;
var south =-1.57079;
var east = 3.1415926;
var north = 1.57079;

function callback() {
return new Cesium.Rectangle(west, south, east, north);
}

Sandcastle.addToolbarButton(‘Save’, function() {
var rect = viewer.scene.camera.computeViewRectangle();
west = rect.west;
south = rect.south;
east = rect.east;
north = rect.north;
});

Sandcastle.addToolbarButton(‘Load’, function() {
viewer.camera.flyTo({
destination: new Cesium.Rectangle(west, south, east, north)
});
});

viewer.entities.add({
rectangle : {
coordinates : new Cesium.CallbackProperty(callback, false),
fill : false,
outline : true,
outlineColor : Cesium.Color.WHITE
}
});

``

Make sure you are using the latest version of Cesium. I know at one point we had a bug where computeViewRectangle wasn’t working correctly in the southern hemisphere.

For saving and loading the camera position, I would recommend the method described in this forum post instead: https://groups.google.com/d/msg/cesium-dev/lolHXdDitOg/GC4iPNiICgAJ

computeViewRectangle isn’t the most accurate for certain tilted and zoomed out views. Saving the position/heading/pitch/roll will give you better results.

Best,

Hannah