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I'm trying to find the direction in which my oculus touch controller is pointing at any given point in time in OpenVR. (The direction in which you would render a ray pointer from the controller) I am using the following function

GetControllerStateWithPose( TrackingUniverseStanding, deviceId, &controllerState, sizeof(controllerState), &trackedDevicePose);

In the picture below, I understand that the position is described by m12 m13 and M14 for x, y and z. But how do I use the m0 to m10 values to find a direction vector in which the controller points at any given time.

Can't post images because of my new account but it can be found here https://camo.githubusercontent.com/d83363a745afeeb1ac7265d10ad55544e15a8fe9/687474703a2f2f7777772e736f6e67686f2e63612f6f70656e676c2f66696c65732f676c5f616e676c6573746f6178657330312e706e67

Would I simply multiply this matrix by [1,1,1,0]^T? Or maybe [0,0,1,0]^T since Z axis is the describes as the forward direction

Thanks

A Singh
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1 Answers1

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I had this problem too (OpenVR Teleportation Problem (Forward direction calculation)). I know that this is a very old question but I figured for the sake of completeness to give the answer here as well.

The methodology here is correct but OpenVR defines its controller's forward vector as vec4(0,0,-1,0). You should be able to multiply the pose matrix by this vector to get the direction. Keep in mind that this is relative to the HMD and do transformations accordingly.

Alex Rowden
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