About Global Coordinates Support in Gaussian Splats Tiler

Cesium ion
1

Hello Cesium Support Team,

I have a question regarding the Tiler for Gaussian Splats.
Does it support global coordinates like a point cloud data in LAS format?
Or is it designed to work only with local coordinates, similar to the current Model Tiler?

Thank you in advance for your support.

2

Hi,

I will forward your question to the tilers team and reach out to you as soon as I have an update.

Thanks,
Ankit

3

Hi @cccCesium,

Yes, the tiler for Gaussian splats does support global coordinates. If you are tiling some data and having an issue getting it geolocated I’d be happy to assist it helping with that.

Thanks
-Jason

4

Thank you for your response.
Just to clarify, were you referring to the “3D Gaussian splats” used in the “Reconstruct models from photos” workflow?
Or were you talking about the splats option in the “PointCloud Tiler”?
My main interest is in uploading PLY data along with coordinate system information, and placing it correctly on the globe. I’d like to understand if there’s a supported method for doing this.

Thank you

5

Hello,

I have a follow-up question regarding the documentation for self-hosted tiling, specifically the “Point Clouds and Gaussian Splats” section.
Is the --input-crs option also applicable when tiling splat PLY files?

Tanak you

6

Were you able to get it to work?

7

Hello,

I’ve tried it and it seems to work fine, thank you.

8

What type of file are you uploading? Is it geolocated? For example, what coordinate system are you uploading it with. Sorry for the dumb questions. I’m eager to get it to work.

9

Hello,

Since ply file does not contain a coordinate system definition, I specified the EPSG name of my country’s planar rectangular coordinate system using the inputCrsOption.
I tested this using the Cesium ion Self-Hosted CLI.
The inputCrs option does not currently appear to be enabled in the Cesium ion GUI service.
I’m not sure, but the inputCrs option may be available using the Cesium ion REST API.

10

Got ya. Okay, thank you.