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https://github.com/bilawalsidhu/gods-eye-view.git
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Mazeyar Moeini FeizabadiandClaude Fable 5.2
1923547d43
The layer loaded two GeoJsonDataSources and a CustomDataSource: 6,459 entities. Every enable rebuilt them (a 100-250 ms task or three and about 1 GB of heap that stayed until the next collection), every disable removed them in a 130-150 ms task, and each horizon sweep that showed a landing marker made Cesium create its billboard again and read the terrain height under it once more. The layer now makes the primitives Cesium built from those entities itself: one GroundPolylinePrimitive for every line, one BillboardCollection for the point markers, one PointPrimitiveCollection for the reference tips and one static polyline Primitive for the stems in view, rebuilt in a worker when a sweep moves a tip. A disable hides them and an enable shows them again, so only the first enable builds anything. A marker is clamped to the ground once, 48 per frame as before; after that Cesium follows the terrain within its own time budget and hiding or showing the marker reads nothing. A map-stack change re-classifies the lines in place. Lines keep the distance-display attribute the entity display gave them: with a float attribute present Cesium keeps the 2.5 px width, and without one it is stored as a byte and drawn 2 px. Co-Authored-By: Claude Fable 5.2 <[email protected]>
40 lines
1.6 KiB
JavaScript
40 lines
1.6 KiB
JavaScript
import * as Cesium from 'cesium';
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import { CABLE_GLOBE_STACK_IDS } from './policy.js';
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/**
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* Ground-line classification for one map stack. The photoreal stack renders
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* Google 3D tiles with the Cesium globe HIDDEN, so cable ground lines only
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* need the 3D-tile classification pass there; every other known stack (the
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* bing stacks and osm) renders imagery on the shown globe, so only the
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* terrain pass applies.
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* Classifying against just the active surface halves the
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* GroundPolylinePrimitive's emitted command sets. BOTH is the safe fallback
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* for an unknown stack — it renders on every surface, exactly the shipped
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* pre-optimization behavior.
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* @param {string|null|undefined} activeId MapStackController stack id.
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* @returns {Cesium.ClassificationType}
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*/
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export function cableClassificationTypeForStack(activeId) {
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if (activeId === 'photoreal') return Cesium.ClassificationType.CESIUM_3D_TILE;
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if (CABLE_GLOBE_STACK_IDS.has(activeId))
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return Cesium.ClassificationType.TERRAIN;
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return Cesium.ClassificationType.BOTH;
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}
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/**
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* Derive the active surface from live scene state. The boot-time
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* `setStack(..., { silent: true })` fires no 'gev:map-stack-changed' event,
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* so the initial classification reads the scene the way the height-datum
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* listeners do: the photoreal regime is exactly "globe hidden".
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* @param {Cesium.Scene|null|undefined} scene
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* @returns {Cesium.ClassificationType}
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*/
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export function cableClassificationTypeForScene(scene) {
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if (!scene?.globe) return Cesium.ClassificationType.BOTH;
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return scene.globe.show === false
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? Cesium.ClassificationType.CESIUM_3D_TILE
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: Cesium.ClassificationType.TERRAIN;
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}
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