Crash when disabling spatialmappingmanager's visual meshes about mixedrealitytoolkit-unity

[flarb]

Also just stopping the observer (commenting out the second line) gives me a similar exception, just somewhere with no callstack.

[DanHolbert]

Hi Ralph,

It seems like one of the MeshRenderer components (Source.GetMeshRenderers()) is somehow invalid at this point. I’d put a breakpoint in UpdateRendering and inspect the renderers list.

In which of the following situations does this crash occur? in Unity, in the emulator, running the universal app on your desktop, or on a HoloLens device?

Cheers,
Dan H

From: Ralph Barbagallo [mailto:[email protected]]
Sent: Thursday, June 16, 2016 10:38 PM
To: Microsoft/HoloToolkit-Unity [email protected]
Subject: [Microsoft/HoloToolkit-Unity] Crash when disabling spatialmappingmanager's visual meshes (#62)

In my project, setting DrawVisualMeshes to false gives me an exception. In this case, I'm triggering it from a voice command where I stop the observer and stop the drawing of the meshes like so:

_spatialMM.StopObserver();
_spatialMM.DrawVisualMeshes = false;

And I get this exception:

Exception thrown: 'System.NullReferenceException' in WinRTBridge.winmd
NullReferenceException: Exception of type 'System.NullReferenceException' was thrown.
at WinRTBridge.Utils.ThrowNewNullReferenceException(String message)
at UnityEngineProxy.InternalCalls.PInvokeCalls.Renderer_Set_Custom_PropEnabled(IntPtr param_0, Boolean param_1)
at UnityEngineProxy.InternalCalls.Renderer_Set_Custom_PropEnabled(Object self, Boolean paramValue)
at HoloToolkit.Unity.SpatialMappingManager.UpdateRendering(Boolean Enable)
at GameManager.ToggleObserver(Boolean on)
at GameManager.StartPlacement()
at GUIManager.OnPlayCommnand()
at UnityEngine.Events.InvokableCall.Invoke(Object[] args)
at UnityEngine.Events.InvokableCallList.Invoke(Object[] parameters)
at HoloToolkit.Unity.KeywordManager.KeywordRecognizer_OnPhraseRecognized(PhraseRecognizedEventArgs args)
at UnityEngine.Windows.Speech.PhraseRecognizer.InvokePhraseRecognizedEvent(String text, ConfidenceLevel confidence, SemanticMeaning[] semanticMeanings, Int64 phraseStartFileTime, Int64 phraseDurationTicks)
at UnityEngine.Windows.Speech.PhraseRecognizer.$Invoke6(Int64 instance, Int64* args)
at UnityEngine.Internal.$MethodUtility.InvokeMethod(Int64 instance, Int64* args, IntPtr method)
(Filename: Line: 0)

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[flarb]

This happens on device, I haven't been able to test it in the editor for a variety of reasons (we really need a system wide gesture input keyboard shortcut override as an editor script)--I'll give it a shot in the emulator, though.

[angelaHillier]

Thanks for reporting this issue! Pat just checked-in a fix for this:
e5fa08a