cesium: Camera.computeViewRectangle doesn't work in 2D or CV

Reported on the forum: https://groups.google.com/forum/?hl=en#!topic/cesium-dev/Ildibeod608

var viewer = new Cesium.Viewer('cesiumContainer', {
    sceneMode: Cesium.SceneMode.SCENE2D
});

viewer.scene.camera.flyTo({
    destination: Cesium.Cartesian3.fromDegrees(-90, 43, 50000),
    duration: 0,
});

viewer.camera.moveEnd.addEventListener(logViewRectangle);

function logViewRectangle() {
    console.log('camera.computeViewRectangle() is ' + JSON.stringify(viewer.scene.camera.computeViewRectangle()));
}

About this issue

Original URL
State: open
Created 8 years ago
Reactions: 2
Comments: 23 (13 by maintainers)

Most upvoted comments

I’ve used this. (Cesium.Rectangle)

var rect = viewer.camera.computeViewRectangle(viewer.scene.globe.ellipsoid, scratchRectangle);
        
if(rect == undefined)
{
	var cl2 = new Cesium.Cartesian2(0, 0);
	var leftTop = viewer.scene.camera.pickEllipsoid(cl2, ellipsoid);
		
	var cr2 = new Cesium.Cartesian2(viewer.scene.canvas.width, viewer.scene.canvas.height);
	var rightDown = viewer.scene.camera.pickEllipsoid(cr2, ellipsoid);
	
	leftTop = ellipsoid.cartesianToCartographic(leftTop);
	rightDown = ellipsoid.cartesianToCartographic(rightDown);
	rect = new Cesium.Rectangle(leftTop.longitude, rightDown.latitude, rightDown.longitude, leftTop.latitude);
}

mlui00 on Oct 5, 2018

I just ran into this issue as well. Are there any updates on a fix?

electricsam on Dec 23, 2019

You can see in my workaround a few posts back that I use camera.pickEllipsoid to find a Cartesian3 on the surface based on screen-space (pixel) coordinates. I use the edges of the canvas, but you could use some fractional offset to determine if, say, more than 20% of the screen on one side is empty space. viewer.scene.camera.pickEllipsoid(new Cesium.Cartesian2(pixWidth * 0.2, pixHeight * 0.2)) would give you a Cartesian3 of a point 20% of the way in from the left side of the canvas, and 20% down from the top. If you get an undefined result, it means that you’ve zoomed out enough that this point is out in space, not over the globe.

thw0rted on Oct 14, 2019