Document Quantized Mesh support

[dvdkon]

This PR documents the new Quantized Mesh support in QGIS: Adding layers, displaying them in the 2D map view and using them as 3D terrain.

Ticket(s): fix #9275

• Backport to LTR documentation is requested

[DelazJ]

@dvdkon thanks a lot for your contribution.
Unless I misread, adding a quantized mesh is kind of adding a specific scene, and we are here almost duplicating the instructions while this imo could be merged with the cesium. What do you think?

[dvdkon]

@dvdkon thanks a lot for your contribution. Unless I misread, adding a quantized mesh is kind of adding a specific scene, and we are here almost duplicating the instructions while this imo could be merged with the cesium. What do you think?

Thanks for the feedback. I initially wrote the instructions separately, because I feel that for users, Cesium 3D tiles and Quantized Mesh tiles don't have that much in common; their grouping under "scenes" is mostly an artefact of QGIS internals, them both being 3D online tiled datasets.

But it's true that the adding process is 90% the same, so I tried to unify the instructions. Does this seem like an improvement to you, or should I keep the separate instructions? I can see the case for either.

[selmaVH1]

Thanks for the feedback. I initially wrote the instructions separately, because I feel that for users, Cesium 3D tiles and Quantized Mesh tiles don't have that much in common; their grouping under "scenes" is mostly an artefact of QGIS internals, them both being 3D online tiled datasets.

I also think the process of adding Quantized Mesh tiles should be merged with Cesium 3D tiles, as both are added through the Scene. The 'Opening Data' section is primarily for explaining how to add data into QGIS. However, if there are any key differences between the two, since both are 3D online tiles, I suggest we describe those differences in this chapter.

[DelazJ]

But it's true that the adding process is 90% the same, so I tried to unify the instructions. Does this seem like an improvement to you, or should I keep the separate instructions? I can see the case for either.

The merged one looks better to me. Thanks @dvdkon .

[DelazJ]

since both are 3D online tiles, I suggest we describe those differences in this chapter.

And yes it could be worth expanding on quantized mesh in tiles chapter...

[dvdkon]

Thanks for your feedback. I've pushed the combined instructions and tried to outline the main differences in purpose between our supported 3D tile formats in "Working with 3D Tiles".