Tileset polygon count

CesiumJS
1

How would I go about doing a polygon count for a specific LOD of a tileset?

I know CesiumJS has the ability to show the number of polygons it’s rendering, but I’m not looking for just the rendered polygons.

Thanks.

2

I think you’d need to traverse the tree and find all tiles at a certain level, parse those b3dms/i3dms, and count the number of vertices in each.

I think the reason there isn’t an easier built-in way to do this is because in 3D Tiles you generally never see a single LOD of the entire tileset in any one view.

3

Thanks for the reply Omar.

The traversing of the tree is not an issue.
Any thoughts on how to parse the b3dms and count the verticies?
Is there a built-in function in CesiumJS for that?

4

Yeah, you’ll have to dig into the source code a bit. This class is what can take and parse a b3dm to extract the glTF: https://github.com/CesiumGS/cesium/blob/master/Source/Scene/Batched3DModel3DTileContent.js.

Here is where it gets called as the tiles load in: