Vive Lock position

[leon.fuchs]

Hello everyone, I am using a HTC Vive. And have the problem that as soon as I lock the position of the headset, the position of the VR player is not on the same position as that of the headset. But is approximately around the vector (0.5, 0.5, 1.7) shifted.

 

Here is an example:

int AppWorldLogic::init()
{       
    proxy = new AppViveProxy();
    proxy->init();

    proxy->setHeadPositionLock(1);
    
    return 1;
}

int AppWorldLogic::update()
{
    VRPlayer* vr_player = VRPlayer::get();
    NodePtr Node1 = World::getNodeByName("NodeDummy_3");
    vr_player->getPlayer()->setWorldTransform(Node1->getWorldTransform());
    

    
    return 1;
}

[silent]

Hi Leon,

Have you tried to simply clearing stored camera offset?

vr_player->getPlayer()->getCamera()->setOffset(mat4_identity);

Thanks!

[leon.fuchs]

Hello silent,
unfortunately this has not solved my problem yet. I'll try to explain it a bit more in detail again. 
When I rotate the controller in front of the VR glasses, the controller rotates around the axis of the offset and not around the locked VR glasses position.

Thanks

[karpych11]

Hello,

You can try to fix the controller position update function void controller_update(int num, const Mat4 &player_transform, int device_id) in class VRPlayerVive.

void VRPlayerVive::controller_update(int num, const Mat4 &player_transform, int device_id)
{
	if (device_id != -1 && vive.isDeviceConnected(device_id))
	{
		mat4 transform = vive.getDevicePose(device_id);

		// get controller position for custom player transform
		Mat4 hmd_transform = Mat4(vive.getDevicePose(HMD_DEVICE_0));
		vec3 delta = inverse(translate(hmd_transform.getTranslate())) * transform.getTranslate();
		transform.setColumn3(3, delta);

		controller[num]->setWorldTransform(player_transform * Mat4(transform) * Mat4(rotateX(-90.0f)));
//...
}

We change the position of the controller from global to local relative to the HMD.