[4.8.2] VR: Positional camera has offset to the right

anonymous_user_c0687f281 · July 31, 2015, 12:05pm

Hi there,

it seems that the reported position of the tracking camera has a offset to the right (about 25 cm at a distance of 40 cm). This leads also to errors when trying to get the angle (yaw) between the headset and the tracker (about 25° at the same distance).

Reproduction:

Create project
Start VR preview (if it’s working)
Open console, enter ‘hmddbg showcamera on’
Hold HMD exactly in front of camera at a distance of about 40-50 cm

As you can see, the reported camera position isn’t the true one (which is more on the left side).

It’s the same when you draw a debug sphere in the engine (which is actually surprisingly complicated right now):

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Begin Object Class=EdGraphPin Name=“EdGraphPin_15789”
End Object
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End Object
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End Object
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End Object
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End Object
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End Object
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End Object
Begin Object Class=EdGraphPin Name=“EdGraphPin_15796”
End Object
Begin Object Name=“EdGraphPin_15789”
PinName=“self”
PinFriendlyName=“Target”
PinToolTip=“Target\nHead Mounted Display Function Library Reference”
PinType=(PinCategory=“object”,PinSubCategoryObject=Class’/Script/Engine.HeadMountedDisplayFunctionLibrary’)
DefaultObject=Default__HeadMountedDisplayFunctionLibrary
bHidden=True
End Object
Begin Object Name=“EdGraphPin_15790”
PinName=“CameraOrigin”
PinToolTip=“Camera Origin\nVector \n\n(out) Origin, in world-space, of the tracking camera”
Direction=EGPD_Output
PinType=(PinCategory=“struct”,PinSubCategoryObject=ScriptStruct’/Script/CoreUObject.Vector’)
AutogeneratedDefaultValue=“0, 0, 0”
LinkedTo(0)=EdGraphPin’K2Node_CallFunction_2202.EdGraphPin_15859’
End Object
Begin Object Name=“EdGraphPin_15791”
PinName=“CameraRotation”
PinToolTip=“Camera Rotation\nRotator \n\n(out) Rotation, in world-space, of the tracking camera”
Direction=EGPD_Output
PinType=(PinCategory=“struct”,PinSubCategoryObject=ScriptStruct’/Script/CoreUObject.Rotator’)
AutogeneratedDefaultValue=“0, 0, 0”
LinkedTo(0)=EdGraphPin’K2Node_CallFunction_2558.EdGraphPin_15926’
End Object
Begin Object Name=“EdGraphPin_15792”
PinName=“HFOV”
PinToolTip=“HFOV\nFloat\n\n(out) Field-of-view, horizontal, in degrees, of the valid tracking zone of the camera”
Direction=EGPD_Output
PinType=(PinCategory=“float”)
DefaultValue=“0.0”
AutogeneratedDefaultValue=“0.0”
End Object
Begin Object Name=“EdGraphPin_15793”
PinName=“VFOV”
PinToolTip=“VFOV\nFloat\n\n(out) Field-of-view, vertical, in degrees, of the valid tracking zone of the camera”
Direction=EGPD_Output
PinType=(PinCategory=“float”)
DefaultValue=“0.0”
AutogeneratedDefaultValue=“0.0”
End Object
Begin Object Name=“EdGraphPin_15794”
PinName=“CameraDistance”
PinToolTip=“Camera Distance\nFloat\n\n(out) Nominal distance to camera, in world-space”
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DefaultValue=“0.0”
AutogeneratedDefaultValue=“0.0”
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PinName=“NearPlane”
PinToolTip=“Near Plane\nFloat\n\n(out) Near plane distance of the tracking volume, in world-space”
Direction=EGPD_Output
PinType=(PinCategory=“float”)
DefaultValue=“0.0”
AutogeneratedDefaultValue=“0.0”
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PinName=“FarPlane”
PinToolTip=“Far Plane\nFloat\n\n(out) Far plane distance of the tracking volume, in world-space”
Direction=EGPD_Output
PinType=(PinCategory=“float”)
DefaultValue=“0.0”
AutogeneratedDefaultValue=“0.0”
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bIsPureFunc=True
FunctionReference=(MemberParent=Class’/Script/Engine.HeadMountedDisplayFunctionLibrary’,MemberName=“GetPositionalTrackingCameraParameters”)
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Pins(4)=EdGraphPin’EdGraphPin_15793’
Pins(5)=EdGraphPin’EdGraphPin_15794’
Pins(6)=EdGraphPin’EdGraphPin_15795’
Pins(7)=EdGraphPin’EdGraphPin_15796’
NodePosX=432
NodePosY=256
NodeGuid=7DC465E64F8C3B19ADD713AE66605B1E
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PinName=“self”
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PinType=(PinCategory=“object”,PinSubCategoryObject=Class’/Script/Engine.HeadMountedDisplayFunctionLibrary’)
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PinName=“DeviceRotation”
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Begin Object Name=“EdGraphPin_15815”
PinName=“DevicePosition”
PinToolTip=“Device Position\nVector \n\n(out) The device's current position, in its own tracking space”
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PinType=(PinCategory=“struct”,PinSubCategoryObject=ScriptStruct’/Script/CoreUObject.Vector’)
AutogeneratedDefaultValue=“0, 0, 0”
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bIsPureFunc=True
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Jumbli · August 1, 2015, 12:08pm

I’ve also noticed that sometimes “hmddbg showcamera on” and the “Get Positonal Tracking Camera” call don’t line up with the actual camera. However, restarting the Oculus runtime service seems to rectify the problem. I haven’t figured out a sequence of events that first leads to the error. The offset amount seems to vary, both vertical and horizontal, but it does seem to mostly be represented too far to the right and often too high.

Have you tried restarting the service?

anonymous_user_c0687f281 · August 3, 2015, 4:48pm

Yes, it really seems, that the runtime itself may be the problem. After restarting the server, the camera offset was gone. But why is that? Isn’t that supposed to be an absolute tracking space?

Jumbli · August 3, 2015, 5:05pm

Yes, there’s got to be a bug in there somewhere. I think many people won’t notice, but if you are trying to show indicators when the user gets close to the tracking boundary it becomes more of a problem. Certainly worth raising with Oculus. I’ll add my comment to your post on Oculus forums so they know it’s not just affecting you.

anonymous_user_c0687f281 · August 3, 2015, 5:53pm

Thank you.

Mctittles · August 10, 2015, 10:54pm

Ok I’m having the same problem, except offset to the left and forward of where it should be. Restarting the service does not fix it. I went into the oculus demo and showing bounds there shows the camera in the correct position, so I guess that is correct in the SDK?

I’d like to get this fixed as I setup a system to allow users to set their view and it saves for the next time the program is launched. I spent one night tweaking the view setup and saved it so my room layout was aligned perfectly, then when I started the next day everything is off. I couldn’t figure out why until I noticed the camera bounds are in the wrong place. Until I can get this fixed correctly I cannot test this software anymore.

anonymous_user_c0687f281 · August 12, 2015, 3:13pm

Can anyone from Epic please confirm this? Rudy?

anonymous_user_e729f54e · August 27, 2015, 5:55pm

Hello ,

I am seeing a little bit of an offset when compared to the cross hairs in the FPS template. I was wondering what bench mark you are using to determine the offset that you are seeing. Could you post a screen shot of your results (I would just like to have a comparison that shows that we are seeing the same issue).

Mctittles · August 27, 2015, 7:35pm

I was referring to the location of camera in shown with camera bounds compared to the real world not the game crosshair. A screenshot won’t be able to show that.

To determine the offset you can peek out the bottom of your rift at the camera and compare what you are seeing with the bounds shown with ‘hmddbg showcamera on’. Sometimes mine is a couple feet offset from where the camera really is.

You can also test by pointing while in VR and having a friend verify where you are pointing.

anonymous_user_c0687f281 · August 27, 2015, 7:37pm

Hi Rudy,

thanks for your answer. It’s very hard to document with a screenshot. It looks like UE4 uses only one eye as the position of the HMD.

I made a photo with the horrible cam of my smartphone:

As you can see, the camera is placed a fair amount to the right side. You can see it actually way better if you just look through the HMD and compare the position.

The offset is not the same always. Sometimes more, something less.

Mctittles · August 27, 2015, 7:38pm

The reason this is a problem for my project is it isn’t consistent and since initial position is based on where the camera last was users might have to reset their camera every time they play instead of being able to set it once and save that setting. As long as they don’t move their camera around that is.

anonymous_user_c0687f281 · August 28, 2015, 10:02am

Update for OVR Runtime 0.7:

Now there seems to be very high latency regarding getPositionalTrackerParameters(). Don’t really know why.

Reproduction:

Open project
Copy & Paste Blueprint code from above (debug sphere)
Open console, enter ‘hmddbg showcamera’
Move your head (e. g. in a small circle) and compare the camera positions of the Oculus debug layer and the debug sphere drawn by UE 4. It takes about 0.5 - 1s to settle down to the same position. That didn’t happen before…

anonymous_user_e729f54e · August 31, 2015, 8:47pm

Hello ,

After setting up project to match that, that is in the screen shot provided. I did see an off set for the debug sphere. It appears to be lined up with the right eye of the oculus. Is this the offset that you are talking about?

anonymous_user_c0687f281 · August 31, 2015, 9:41pm

Yes, that would make sense. But shouldn’t the virtual camera not perfectly align with the real one?

anonymous_user_c0687f281 · September 3, 2015, 3:47pm

Please wait a sec, you wrote:

“I did see an off set for the debug sphere. It appears to be lined up with the right eye of the oculus.”

So the reported camera position is not intended to be perfectly aligned with the real one? Is it correct, that the reported position of the HMD is the right eye (and not a point exactly between the left and the right eye as expected)?

anonymous_user_e729f54e · September 3, 2015, 3:42pm

Hello ,

From what I have gathered about this issue, I believe that this is currently working as intended. I will provide updates for this if things change.

Make it a great day

anonymous_user_e729f54e · September 10, 2015, 1:39pm

Hello ,

I wanted to give you an update. I am still looking into this issue. I want to make sure that I can give you an official answer on your last comment. I want to pop in here an let you know that this is still being looked into.

anonymous_user_e729f54e · October 14, 2015, 8:47pm

After doing a bit of digging I found that there was a report that had been filled out for this issue (UE-17546). This was reported to be working as intended. I hope that this information helps.

Make it a great day