IHeadMountedDisplay needs GetBaseOffset

Development Rendering
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1

It has GetBaseOrientation but no GetBaseOffset. Edit: I’m using C++

GetBaseOffset is needed to position real-world objects relative to HMDs with positional tracking. In my case, I have a physical object (PSMove controller) that I’ve coregistered to the Oculus DK2 camera space and I need to further transform that into the game world. I believe I need access to the HMD yaw and offset to do so.

I’ve [asked a separate question][2] about how to include the OculusRift plugin in my module as a work around.

[2]:

2

Moved to Bug Reports.

3

Hello bullale,

I have a quick question for you before we dig into specifics. Have you tried using the “Get Base Rotation and Base Offset in Meters” node?

4

Hi Rudy.
I’m sorry I didn’t state this explicitly (it was only a tag), but I’m using C++.
GEngine->HMDDevice->GetBaseOrientation() works wonderfully.
GEngine->HMDDevice->GetBaseOffset or GEngine->HMDDevice->GetBaseOffsetInMeters do not exist.

Here’s a patch.link text

5

Hello bullale,

After doing some digging I have a suggestion that I would like for you to try.

Could you try using the following to create an OculusHMD variable?

FOculusRiftHMD* OculusHMD = GetOculusHMD();

With the OculusHMD variable created you should then be able to pull get the information that you need from that variable.

OculusHMD->GetBaseOffsetInMeters();

Could you let me know if this works for you?

6

I’ll try, but…

  1. How do I make FOculusRiftHMD available to me? (See my other [question][1] that I linked to in the OP).

  2. I’m doing this within a (game) plugin. My understanding isthat I should not be dependent on another (Engine) plugin. Wouldn’t it be preferable for me to use the IHeadMountedDisplay interface?

[1]:

7

In case it wasn’t clear, the patch I included above works as expected. Using that patch, I was able to complete my plugin.

I think it is intuitive that, if IHeadMountedDisplay has a function called GetBaseOrientation then it should also have a function like GetBaseOffset for HMDs with positional tracking, and it will return FVector(0) for HMDs without positional tracking.

If, for some reason, you hate taking patches then I can make a pull request. Just let me know.

8

Hello bullale,

I have written up a feature request ( UE-18532) for the GetBaseOffset and I have submitted it to the developers for further consideration. I am happy to hear that you have your plug in up and running. As for submitting a pull request, you may feel free to place that request here:

https://.com/EpicGames/UnrealEngine/pulls

Make it a great day

9

I finally got around to making a pull request.

10

Hello bullale,

I am happy to hear that you have gotten around to submitting a pull request. Could you provide an update if/when the developers get back to you on the results of your pull request?

Make it a great day