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pickPosition only works on 3D tiles if depthTestAgainstTerrain = true

See original GitHub issue

This picking example only works if you uncomment the third line

var viewer = new Cesium.Viewer('cesiumContainer');
var scene = viewer.scene;
//scene.globe.depthTestAgainstTerrain = true;

var labelEntity = viewer.entities.add({
    label : {
        text: 'X',
        fillColor: Cesium.Color.RED,
        show: false,
        horizontalOrigin: Cesium.HorizontalOrigin.CENTER,
        verticalOrigin: Cesium.VerticalOrigin.BOTTOM
    }
});

// Mouse over the globe to see the cartographic position
var handler = new Cesium.ScreenSpaceEventHandler(scene.canvas);
handler.setInputAction(function(click) {
    var foundPosition = false;
    if (scene.mode !== Cesium.SceneMode.MORPHING) {
        var pickedObject = scene.pick(click.position);
        if (scene.pickPositionSupported && Cesium.defined(pickedObject)) {
            var cartesian = viewer.scene.pickPosition(click.position);

            if (Cesium.defined(cartesian)) {
                labelEntity.position = cartesian;
                foundPosition = true;
            }
        }
    }

    labelEntity.label.show = foundPosition;
}, Cesium.ScreenSpaceEventType.LEFT_CLICK);

var tileset = viewer.scene.primitives.add(new Cesium.Cesium3DTileset({
    url : '../../../Specs/Data/Cesium3DTiles/Tilesets/Tileset'
}));

tileset.readyPromise.then(function() {
    var boundingSphere = tileset.boundingSphere;
    viewer.camera.viewBoundingSphere(boundingSphere, new Cesium.HeadingPitchRange(0.0, -0.5, boundingSphere.radius * 2));
    viewer.camera.lookAtTransform(Cesium.Matrix4.IDENTITY);
});

Issue Analytics

State:
Created 6 years ago
Comments:12 (8 by maintainers)

Top GitHub Comments

2reactions

JoshuaKahncommented, May 12, 2021

I’m having this bug now - setting viewer.scene.globe.depthTestAgainstTerrain = false makes pickPosition on the ellipsoid fail.

I want to disable depthTestAgainstTerrain to stop KMLs from digging into the terrain but in doing so I can’t pick on the ellipsoid anymore.

0reactions

UgniusFEcommented, Sep 22, 2021

I believe the bug is here https://github.com/CesiumGS/cesium/blob/a02065697660f2ee1960548a5630578a8a11e3d0/Source/Scene/Picking.js#L396-L402

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