B3dm file with RTC_CENTER,but it's not rotated correctly

CesiumJS
1

Hi,
I have a 3d-tiles file which b3dm has RTC_CENTER property. But when I loaded the file,the model rotated wrong.Just like the picture.

image
image1478×1043 195 KB

  • here is the json file and a b3dm file.
    files.zip (16.9 KB)

  • The gltf model which inside b3dm file is y-up and origin center is zero.

Why it’s roated and how can i make it correctly.

Thanks.

2

Hi, it’s rotated because in Cesium everything is put on the globe sphere.

One way to fix it is add a transform, see my blog cesium 3d tiles model placement | bert how to do this.

I’ve tried it with your model, result see https://bertt.github.io/cesium_3dtiles_samples/samples/china .
I’ve removed the RTC_CENTER from the b3dm, the translation is now in the transform.

Another way is to use espg:4978 in the source data, then the transform is not needed (but the glTF looks skewed).

3

Thank you,the blog is great,it fixed the problem.

I’m still curious about how to use ‘RTC_CENTER’ correctly.

Thanks again.