feat: add terrain-server MCP server#30
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Add a new MCP server for managing terrain providers on the CesiumJS globe. Server (servers/terrain-server/): - terrain_set: Set terrain from Cesium Ion assets, direct URLs, or flat ellipsoid - terrain_get: Query current terrain provider info and capabilities - terrain_remove: Reset terrain to flat WGS84 ellipsoid - Zod v4 schemas for input validation and response structure - 31 unit tests covering schemas, tools, and client manager Client (test-applications/packages/client-core/): - CesiumTerrainManager with setTerrain, getTerrain, removeTerrain handlers - Terrain type definitions extending MCPCommandResult - Unit tests with full Cesium module mocking Integration: - Port 3007, following existing server conventions - Registered in monorepo build/dev/test scripts - Added to web app configuration and esbuild defines - Updated parent README with terrain server documentation Closes CesiumGS#29
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@gaopengbin Looks good! Thanks for contribution. I will add a small demo showing terrain mcp capabilities into README and will merge the PR. |
MKartaviciute
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Apr 1, 2026
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Summary
Add a new MCP server for managing terrain providers on the CesiumJS globe.
terrain_mcp_server.mp4
Closes #29
New Tools
terrain_setterrain_getterrain_removeSource Types
ion— Cesium Ion terrain assets (e.g., Cesium World Terrain with asset ID 1)url— Direct terrain server URLs (quantized-mesh endpoints)ellipsoid— Flat WGS84 ellipsoid with no terrain elevationTerrain Options
requestVertexNormals— Request vertex normals for lighting (default: true for ion/url)requestWaterMask— Request water mask data for water effects (default: false)requestMetadata— Request terrain metadata (default: true)Changes
Server (
servers/terrain-server/)Client (
test-applications/packages/client-core/)CesiumTerrainManagerimplementingManagerInterfacesetTerrain: CreatesCesiumTerrainProvider(Ion/URL) orEllipsoidTerrainProvidergetTerrain: Reads current provider metadata and capabilitiesremoveTerrain: Resets toEllipsoidTerrainProviderMCPCommandResultIntegration
Testing
Architecture Note
Unlike imagery layers (collection-based, indexed), terrain is a singleton — the viewer has one
terrainProviderat a time. This simplifies the API to set/get/remove without needing ID tracking or ordering.