Fix missing cesium-sandcastle command docs (#81)

Author: wolfo951

docs/_sidebar.md

@@ -51,4 +51,5 @@
     * [owner](access-control/member/owner/overview.md)
     * [user](access-control/member/user/overview.md)
 * [combined commands](combined-commands/overview.md)
-  * [synchronization](combined-commands/synchronization.md)
+  * [synchronization](combined-commands/synchronization.md)
+  * [cesium sandcastle](combined-commands/cesium-sandcastle.md)

docs/combined-commands/cesium-sandcastle.md

@@ -0,0 +1,37 @@
+# Cesium Sandcastle Export
+
+The Cesium Sandcastle export command allows you to generate a URL to view an iModel in Cesium Sandcastle. This URL can be used to visualize 3D tilesets in a Cesium environment.
+
+**Workflow steps:**
+
+1. **Create Export**  
+   Use the [Create Export](https://developer.bentley.com/apis/mesh-export/operations/create-export/) API to generate a new export for the specified iModel and changeset.  
+   - Input: iModel ID, changeset ID, and export type (`CESIUM`).
+   - Output: Export ID and status.
+
+2. **Check Export Status**  
+   Use the [Get Export](https://developer.bentley.com/apis/mesh-export/operations/get-export/) API to check the status of the export.  
+   - Poll the export status until it is marked as `Complete`.
+
+3. **Extract Tileset URL**  
+   Parse the `_links.mesh.href` property from the completed export to retrieve the tileset URL.
+
+4. **Generate Sandcastle URL**  
+   Compress the tileset URL and embed it into a Cesium Sandcastle URL.  
+   - Use the `deflate` function to compress the data and encode it in Base64 format.
+
+5. **Open in Browser (Optional)**  
+   If the `--open` flag is provided, open the generated URL in the default browser.
+
+## Notes
+
+1. The export type must be `CESIUM` to generate a tileset compatible with Cesium Sandcastle.
+2. The tileset URL is extracted from the `_links.mesh.href` property of the export response.
+3. The generated URL can be opened directly in a browser or shared with others.
+
+## References
+
+- [Cesium Sandcastle](https://sandcastle.cesium.com/)
+- [Create Export API](https://developer.bentley.com/apis/mesh-export/operations/create-export/)
+- [Get Export API](https://developer.bentley.com/apis/mesh-export/operations/get-export/)
+

docs/combined-commands/overview.md

@@ -4,4 +4,5 @@ Workflow reference for combined commands (such as `imodel populate`) that combin
 
 ## Workflows
 
-- [Synchronization](combined-commands/synchronization.md)
+- [Synchronization](combined-commands/synchronization.md)
+- [Cesium Sandcastle Export](combined-commands/cesium-sandcastle.md)

docs/imodel/view/cesium-sandcastle.md

@@ -29,6 +29,6 @@ itp imodel view cesium-sandcastle --imodel-id 5e19bee0-3aea-4355-a9f0-c6df9989ee
 itp imodel view cesium-sandcastle --imodel-id 5e19bee0-3aea-4355-a9f0-c6df9989ee7d --changeset-id 2f3b4a8c92d747d5c8a8b2f9cde6742e5d74b3b5 --open
 ```
 
-## API Reference
+## Workflow Reference
 
-[Cesium Sandcastle](https://cesium.com/docs/sandcastle/)
+[Cesium Sandcastle](/combined-commands/cesium-sandcastle)