Spatial Mapping won't activate Hololens2 UE4

Question

Spatial Mapping won't activate Hololens2 UE4

Ragiarc 6

I've been trying to get spatial mapping to activate for my hololens 2 project in Unreal Engine 4.27.2 for a few days now. I've closely followed the instruction here: https://learn.microsoft.com/en-us/windows/mixed-reality/develop/unreal/unreal-spatial-mapping#spatial-mapping-at-runtime to no avail.

My hololens platform settings has the spatial perception box ticked.
My ar session (which is otherwise working) has all of the world mapping options ticked except for "Track scene objects".
My pawn activates the Ar session and calls ToggleARCapture with the on/off box checked.
I added the "AugmentedReality","MRMesh" strings to build file.
My ARTrackableNotify never fires its On Update Tracked Geometry event
Changing around my Spatial Meshing Volume Size has no effect.

Any help would be appreciated.

Franklin Chen 1 Reputation point Microsoft Employee Moderator

2022-02-01T07:34:03.593+00:00

Hi Ragiarc,

If you have created an Actor Blueprint and added the ARTrackableNotify component. Could you please share your Events setting of ARTrackableNotify component and the Blueprint graph. Also we suggest you checking this sample, the guidance: https://github.com/microsoft/MixedReality-GraphicsTools-Unreal/blob/main/Docs/SpatialPerception.md
Ragiarc 6 Reputation points

2022-02-02T01:30:36.413+00:00

Thank you for your reply. Attached are screen shots of my blueprint and settings. I tried opening the project but it was unable to build.
Franklin Chen 1 Reputation point Microsoft Employee Moderator

2022-02-02T04:02:47.483+00:00

Regarding "XXX could not be compiled. Try rebuilding from the source" error, this is very common for UE, you can search this error message to find the answer in their community to rebuild this project.
Ragiarc 6 Reputation points

2022-02-03T19:06:36.227+00:00

When trying to build from source I get the following errors. It looks like I'm just missing files, that I also can't find in the repository. Am I doing something wrong? Is there any way you can help answer my original question so I'm not wasting time trying to get this example to work? Thanks again
Ragiarc 6 Reputation points

2022-02-04T18:35:27.757+00:00

Additional Errors:
Chaos 60 Reputation points

2023-06-14T04:22:11.5933333+00:00

I have the same question .In the course of spatial mapping, I followed your steps step by step. When binding the ToggleSpatialMesh button event, I compose the ToggleARSession event in your way. But when I run it, there is no response after clicking the scan world button button. Then, I downloaded the official project link you provided, I ran the project, and it was ok to click the scan world button, no problem. But a strange thing came, when I migrated the core content of the official project to a new project (UE4 4.72), it couldn’t work again, as if it was ok only in the project you provided. Do you have any extra operations after finishing the spatial mapping tutorial? Why did I follow what you taught step by step but it didn’t work in the end? Looking forward to your reply, thank you.

1 answer

Your answer

Franklin Chen 1 Reputation point Microsoft Employee Moderator

2022-02-01T07:34:03.593+00:00

Hi Ragiarc,

If you have created an Actor Blueprint and added the ARTrackableNotify component. Could you please share your Events setting of ARTrackableNotify component and the Blueprint graph. Also we suggest you checking this sample, the guidance: https://github.com/microsoft/MixedReality-GraphicsTools-Unreal/blob/main/Docs/SpatialPerception.md
Ragiarc 6 Reputation points

2022-02-02T01:30:36.413+00:00

Thank you for your reply. Attached are screen shots of my blueprint and settings. I tried opening the project but it was unable to build.
Franklin Chen 1 Reputation point Microsoft Employee Moderator

2022-02-02T04:02:47.483+00:00

Regarding "XXX could not be compiled. Try rebuilding from the source" error, this is very common for UE, you can search this error message to find the answer in their community to rebuild this project.
Ragiarc 6 Reputation points

2022-02-03T19:06:36.227+00:00

When trying to build from source I get the following errors. It looks like I'm just missing files, that I also can't find in the repository. Am I doing something wrong? Is there any way you can help answer my original question so I'm not wasting time trying to get this example to work? Thanks again
Ragiarc 6 Reputation points

2022-02-04T18:35:27.757+00:00

Additional Errors:
Chaos 60 Reputation points

2023-06-14T04:22:11.5933333+00:00

I have the same question .In the course of spatial mapping, I followed your steps step by step. When binding the ToggleSpatialMesh button event, I compose the ToggleARSession event in your way. But when I run it, there is no response after clicking the scan world button button. Then, I downloaded the official project link you provided, I ran the project, and it was ok to click the scan world button, no problem. But a strange thing came, when I migrated the core content of the official project to a new project (UE4 4.72), it couldn’t work again, as if it was ok only in the project you provided. Do you have any extra operations after finishing the spatial mapping tutorial? Why did I follow what you taught step by step but it didn’t work in the end? Looking forward to your reply, thank you.

Answer 1

Franklin Chen 1 Microsoft Employee Moderator

Hi Ragiarc,

Sorry for the late response, I just got back to office and have chance to test with HoloLens 2.

With the steps in Spatial Mapping in Unreal and the details in your post, I think you can try to move the ARSession and Spatial Mapping Capture setup part from the ARTrackableNotify's BP to the level BP.

To verify that documentation, I just built a simple demo, you can check that here.

Ragiarc 6 Reputation points

2022-02-07T19:30:19.657+00:00

I appreciate the help. I actually just got it solved. My ARTrackable Notify had Auto Activate checked. Resetting it to default fixed my problem
Franklin Chen 1 Reputation point Microsoft Employee Moderator

2022-02-08T01:52:39.79+00:00

Glad to see it's resolved, thank you for sharing the solution. Could you please mark/accept the answer so we can close this question for now? Thanks!
Chaos 60 Reputation points

2023-06-14T05:09:55.22+00:00

I have the same question .In the course of spatial mapping, I followed your steps step by step. When binding the ToggleSpatialMesh button event, I compose the ToggleARSession event in your way. But when I run it, there is no response after clicking the scan world button button. Then, I downloaded the official project link you provided, I ran the project, and it was ok to click the scan world button, no problem. But a strange thing came, when I migrated the core content of the official project to a new project (UE4 4.72), it couldn’t work again, as if it was ok only in the project you provided. Do you have any extra operations after finishing the spatial mapping tutorial? Why did I follow what you taught step by step but it didn’t work in the end? Looking forward to your reply, thank you.

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Spatial Mapping won't activate Hololens2 UE4

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