Cesium: Reflections of points in sky atmosphere

Created on 9 Aug 2018 · 5Comments · Source: CesiumGS/cesium

Look please at this example: editor view / full page view

In the example, four cities Entity are added to the map. All entities include Label and Point. When viewed from a certain angle, a reflection of points in the sky appears.

It has been experimentally verified that the more points on the map, the more points are reflected in the sky. As the camera moves, the points in the sky begin to flicker.

Below is the code setting the camera position:

var heading = Cesium.Math.toRadians(142.8074308297535);
var pitch = Cesium.Math.toRadians(-3.04226367144852);
var range = 15000.0;
let position = entity4.position.getValue(viewer.clock.currentTime);
viewer.camera.lookAt(position, new Cesium.HeadingPitchRange(heading, pitch, range));

untitled-0 1

category - graphics priority - next release type - bug

Source

ollazarev

All 5 comments

Thanks for reporting this @ollazarev, and thanks for including the code example! If possible, it would be a little bit easier for us if you could use our Sandcastle application for sample code instead of codepen: https://cesiumjs.org/Cesium/Build/Apps/Sandcastle/
There's a 'share' button at the top to get a link. Either way is fine though =)

As a workaround you can set viewer.scene.logarithmicDepthBuffer = false; to fix the problem

Minimal Example:

var  viewer = new Cesium.Viewer('cesiumContainer');

function getEntity(coords) {
    return new Cesium.Entity({
        position : Cesium.Cartesian3.fromDegrees(coords[0], coords[1]),
        point: {
             pixelSize: 5,
        }
    });
}

viewer.entities.add(getEntity([-101.678, 57.7833]));
var entity4 = viewer.entities.add(getEntity([-79.38318429999998, 43.653226]));

var heading = Cesium.Math.toRadians(142.8074308297535);
var pitch = Cesium.Math.toRadians(-3.04226367144852);
var range = 15000.0;
var position = entity4.position.getValue(viewer.clock.currentTime);
viewer.camera.lookAt(position, new Cesium.HeadingPitchRange(heading, pitch, range));

@bagnell this is another log depth issue, can you look into this? I'm going to mark it 'next release' since it's a regression.

hpinkos on 9 Aug 2018

This is a regression of #5501. The sandcastle demo there is reproducible once again.

var viewer = new Cesium.Viewer('cesiumContainer');
var collection = new Cesium.PointPrimitiveCollection();
viewer.scene.primitives.add(collection);

// Add 10,000 points to random positions
for (var i = 0; i < 10000; i++) {
    var lat =  Math.random() * 360 - 180; 
    var long =  Math.random() * 360 - 180; 
    collection.add({
        position : Cesium.Cartesian3.fromDegrees(lat, long),
        pixelSize: 3,
        disableDepthTestDistance: 1
    });
}