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Edit: This has been updated to build upon #12237 , which therefore should be merged first
Description
Support for the
NGA_gpm_local
extension has recently been added to Cesium JS, via #12204. This (indirectly) includes the possibility to pick metadata values from the GPM PPE (Per-Point Error) textures, by treating them as property textures and apply metadata picking.This PR adds a Sandcastle that demonstrates the GPM visualization.
For now, this Sandcastle is in the
/Development
section, but can easily be moved elsewhere. It includes the option to visualize property texture values, and therefore might eventually replace https://sandcastle.cesium.com/index.html?src=Custom%20Shaders%20Property%20Textures.htmlThe current state is a draft. It already replicates most of the functionality from an existing demo. But unfortunately, there seems to be an issue that is related to scaling and picking the metadata values from property textures for this data set: The picking functionality currently returns wrong values. The reason for this still has to be investigated.
Author checklist
CONTRIBUTORS.md
CHANGES.md
with a short summary of my change