support for polylines on terrain via entity API #6689
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| /** | ||
| * @private | ||
| */ | ||
| function StaticGroundPolylinePerMaterialBatch(orderedGroundPrimitives) { |
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This is mostly copied from StaticGroundGeometryPerMaterialBatch, it just allows a lot more flexibility in batching and needs its own primitive-type.
| onselect : function() { | ||
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| if (!Cesium.Entity.supportsPolylinesOnTerrain(viewer.scene)) { | ||
| console.log('Polylines on terrain is not supported on this platform'); |
| rectangle : { | ||
| coordinates : Cesium.Rectangle.fromDegrees(-99.5, 31.0, -90.0, 41.0), | ||
| material : Cesium.Color.BLUE, | ||
| zIndex: 1 | ||
| } | ||
| }); | ||
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| if (!Cesium.Entity.supportsPolylinesOnTerrain(viewer.scene)) { | ||
| console.log('Polylines on terrain is not supported on this platform, Z-index will be ignored'); |
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is -> are for here and below.
| var that = this; | ||
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| // Load terrain heights | ||
| if (!this._terrainHeightsReady) { |
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Check GroundPolylinePrimitive._initialized or make a private function so this doesn't wait on the promise for every instance.
| @@ -513,8 +575,11 @@ define([ | |||
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| this._line = line; | |||
| this._primitives = primitives; | |||
| this._groundPrimitives = groundPrimitives; | |||
| this._groundPolylinePrimitive = undefined; | |||
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Since this could be a line in a PolylineCollection of a GroundPolylinePrimitive, delay the PolylineCollection creation and the line added until you know which.
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This could potentially create and destroy primitives a lot if clampToGround is dynamic. What do you think @mramato?
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Should we automatically clamp to ground when all of the position heights are zero? |
I was wondering if this would be kind of a breaking change, but I guess I can't see a use case where users would be counting on intentional heights of 0 behaving like they do now. It does put additional onus on the Entity API layer to check position heights though, which seems like it could duplicate a lot of the cartesian-to-cartographic work in |
I would recommend against this change. There are certainly places in the world where the ground is below 0, so it's not even a guarantee on the ground is what is desired, plus there are performance issues to consider as well. We might change our mind later (when terrain is on by default) but I wouldn't suggest it for this PR. |
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@bagnell updated! |
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👍 |
See #6615