Polyline on Terrain in IE causes renderer to crash

[carsnwd]

Sandcastle example

The sandcastle from the Polyline on Terrain blog post here: https://cesium.com/blog/2018/07/23/polylines-on-terrain/

Browser: IE11

Operating System: Windows

It appears that it does not work on IE causing the renderer to crash.

An error occurred while rendering. Rendering has stopped.
TypeError: Unable to get property '_target' of undefined or null reference
TypeError: Unable to get property '_target' of undefined or null reference
   at UniformSampler.prototype.set (https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:94053:9)
   at ShaderProgram.prototype._setUniforms (https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:95370:13)
   at continueDraw (https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:171970:9)
   at Context.prototype.draw (https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:172007:9)
   at DrawCommand.prototype.execute (https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:91119:9)
   at executeCommand (https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:239186:13)
   at executeCommands (https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:239427:17)
   at executeCommandsInViewport (https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:239963:9)
   at updateAndExecuteCommands (https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:239756:13)
   at render (https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:240396:9)

If there is anything to quick fix it, to at least get it running on IE that be great help to me 👍 . I'm looking into this for some of our code now and can update if I figure out anything in particular that causes it so IE at least doesn't crash the renderer.

Thanks!

[carsnwd]

#7103

I believe it is related to this issue or the same issue?

[carsnwd]

Ah I believe it is just with the primitives API is the issue.

[carsnwd]

I see, I believe the issue is that due to limitations of WebGL on IE the polylines on terrain can't be supported?

[hpinkos]

@carsnwd, yes, IE does not support polylines on terrain. You can check Cesium.GroundPolylinePrimitive.isSupported to determine if polylines on terrain are supported for the browser in which your app is running.

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