when zoom out or rotate viewer, my cesium model disappeared?

CesiumJS
1

I have a very long model converted to b3dm type and load it using cesium sample code below:

var tileset = viewer.scene.primitives.add(new Cesium.Cesium3DTileset({

// url : ‘./tilesets/TilesetWithDiscreteLOD/’

url :’./tilesets/test/’

}));

tileset.readyPromise.then(function(tileset) {

viewer.camera.viewBoundingSphere(tileset.boundingSphere, new Cesium.HeadingPitchRange(0, 0, 0));

viewer.camera.lookAtTransform(Cesium.Matrix4.IDENTITY);

});

The issue is that when I zoom out or rotate viewer, the model disappeared.The result is below:

My ceisum model on the google drive url is :

cesium 1.3.9+win10+Chrome

Any helped would be greatly appreciated, thanks.

2

The tile is disappearing because its bounding volume is pretty small and is going out of view. It is the red area in the picture below (shown with tileset.debugShowBoundingVolume = true). Try making it larger to encompass the full model.

3

OK,thanks Sean.I made the bounding volume larger as below:
“boundingVolume”: {

“region”: [

2.097593752274169,

0.5337356166356161,

2.0997736731670527,

0.533743353294616,

-800.59912109375,

2044.27734375

]

The result like below:

It works better than before,but when I rotate the model,it is still disappearing sometimes.

like below:

Is the issue associated with sizeof bounding volume?

在 2018年3月8日星期四 UTC+8上午9:10:19，Sean Lilley写道：

4

I have refreshed my models and json file on google drive:

在 2018年3月8日星期四 UTC+8下午12:08:36，xuzhit…@163.com写道：

5

Ideally the bounding volume should enclose the model completely in all directions. It still looks like the bounding volume is very thin:

6

OK,Thanks very much.I will try making it fatter.

在 2018年3月9日星期五 UTC+8上午8:38:36，Sean Lilley写道：