Need help on OpenVr Driver

[inlet511]

Sorry to post this here, but I can't find another proper place to ask for help.

My question in short

How to properly setup a driver for a custom single device on steamVR platform?

Backgrounds

• Our company is developing a VR chair device, which uses a round plate for controlling(controlled by foot) character movment
• Our device needs only axis input, no pose needed.
• We want it to be compatible with most of the VR devices on the market. This means both the index/touch controllers and our device can control movement at the same time.

What have I done

https://github.com/inlet511/OpenVr_DriverTest I wrote a simple driver for testing, the driver has only one controller, which contains two groups of components, joystick and trackpad. In RunFrame of controller driver, I randomly set x position of joystick and trackpad to -0.5f and 0.5f, y position is always 0.95f, click and touch are both always true.

Questions in Detail:

The code seems to be straight forward, however I have so many questions about input profile and legacy bindings. For simplicity, I am focusing on these three questions for now:

1. In the page "SteamVR->Devices->Controller Settings->Manage Controller Bindings", there's a Active Controller field, the value of this field seems to depend on which controller steamVR detects first, if so , how can I set up for my device if steamVR detects other device first?
2. Now I can see my controller in "TEST CONTROLLER" page of SteamVR, but I failed to get my controller working in any vr game. What can I do to make it work in games?
3. I tried to set my controller's ETrackedControllerRole to TrackedControllerRole_Treadmill and TrackedControllerRole_OptOut which seems to be fair, but in both of these cases, the "TEST CONTROLLER" page doesn't show the input correct(There's some screenshots in my git repository). Am I doing it wrong? Now I have to set it to TrackedControllerRole_LeftHand (or RightHand), but this seems to be conflicting the original controllers.....

I'll be very grateful if someone gives me some ideas, this openvr driver has been torturing me for weeks...thank you very much.

[danwillm]

TrackedControllerRole_Treadmill is the correct controller type for what you're describing. If you've set up the device correctly in openvr (along with the appropriate input profile configuration), then you should see an additional option in the bindings interface to set your device inputs due to being a treadmill.

[inlet511]

TrackedControllerRole_Treadmill is the correct controller type for what you're describing. If you've set up the device correctly in openvr (along with the appropriate input profile configuration), then you should see an additional option in the bindings interface to set your device inputs due to being a treadmill.

Thank you for replying, I felt TrackedControllerRole_Treadmill would be proper for my device, Then there must be something wrong with my input profile configuration, maybe legacy bindings too. Would you mind take a look at my configurations? I'm posting it below.

[inlet511]

Additional Info:

Controller Driver's Activate function:

EVRInitError ControllerDriver::Activate(uint32_t unObjectId)
{
	driverId = unObjectId; //unique ID for your driver

	PropertyContainerHandle_t props = VRProperties()->TrackedDeviceToPropertyContainer(driverId); //this gets a container object where you store all the information about your driver

	VRProperties()->SetStringProperty(props, Prop_InputProfilePath_String, "{example}/input/controller_profile.json"); //tell OpenVR where to get your driver's Input Profile
	VRProperties()->SetInt32Property(props, Prop_ControllerRoleHint_Int32, ETrackedControllerRole::TrackedControllerRole_Treadmill); //tells OpenVR what kind of device this is
	VRProperties()->SetBoolProperty(props, Prop_NeverTracked_Bool, true);
	VRProperties()->SetStringProperty(props, Prop_SerialNumber_String, "example_controler");
	//VRProperties()->SetInt32Property(props, Prop_Axis0Type_Int32, k_eControllerAxis_TrackPad);
	//VRProperties()->SetInt32Property(props, Prop_Axis2Type_Int32, k_eControllerAxis_Joystick);
// 
	VRDriverInput()->CreateBooleanComponent(props, "/input/anything/x", &boolHandle);

	VRDriverInput()->CreateScalarComponent(props, "/input/joystick/x", &joystickXHandle, EVRScalarType::VRScalarType_Absolute, EVRScalarUnits::VRScalarUnits_NormalizedTwoSided);
	VRDriverInput()->CreateScalarComponent(props, "/input/joystick/y", &joystickYHandle, EVRScalarType::VRScalarType_Absolute,EVRScalarUnits::VRScalarUnits_NormalizedTwoSided); 
	VRDriverInput()->CreateBooleanComponent(props, "/input/joystick/touch", &joyStickTouchHandle);
	VRDriverInput()->CreateBooleanComponent(props, "/input/joystick/click", &joyStickClickHandle);

	VRDriverInput()->CreateScalarComponent(props, "/input/trackpad/y", &trackpadYHandle, EVRScalarType::VRScalarType_Absolute,EVRScalarUnits::VRScalarUnits_NormalizedTwoSided);
	VRDriverInput()->CreateScalarComponent(props, "/input/trackpad/x", &trackpadXHandle, EVRScalarType::VRScalarType_Absolute,EVRScalarUnits::VRScalarUnits_NormalizedTwoSided); 
	
	VRDriverInput()->CreateBooleanComponent(props, "/input/trackpad/touch", &trackpadTouchHandle);
	VRDriverInput()->CreateBooleanComponent(props, "/input/trackpad/click", &trackpadClickHandle);


	return VRInitError_None;
}

controller_profile:

{
  "jsonid": "input_profile",
  "controller_type": "example_controller",
  "legacy_binding": "{example}/input/legacy_bindings_example.json",
  "device_class" : "TrackedDeviceClass_Controller",
  "input_bindingui_mode": "single_device",
  "input_bindingui_left": {
		"image": "{example}/icons/game_controller.svg"
  },
  "should_show_binding_errors": true,
  "input_source": {
    "/input/joystick": {
      "type": "joystick",
      "click": true,
      "touch": true,
      "binding_image_point": [0,0]
    },
	"/input/trackpad" : { 
        "type" : "trackpad",
        "binding_image_point" : [ 0, 0 ],
        "force" : false,
        "click" : true,
        "touch" : true
    }
  }
}

Legacy Binding json:

{
   "bindings" : {
      "/actions/legacy" : {
	  "haptics" : [
         ],
	 "poses" : [
	 ],
	 "sources" : [
		{
		   "inputs" : {
			  "position" : {
				 "output" : "/actions/legacy/in/left_axis0_value"
			  },
			  "click":{
				  "output" : "/actions/legacy/in/left_axis0_press"
			  },
			  "touch":{
				  "output" : "/actions/legacy/in/left_axis0_touch"
			  }
		   },
		   "mode" : "trackpad",
		   "path" : "/user/hand/left/input/trackpad"
		},
		{
		   "inputs" : {
			  "position" : {
				 "output" : "/actions/legacy/in/left_axis0_value"
			  },
			  "click" :{
				  "output": "/actions/legacy/in/left_axis0_press"
			  },
			  "touch":{
				  "output" : "/actions/legacy/in/left_axis0_touch"
			  }
		   },
		   "mode" : "joystick",
		   "path" : "/user/hand/left/input/joystick"
		}
	 ]
      }
   },
   "category" : "legacy",
   "controller_type" : "example_controller",
   "description" : "Legacy mapping for example",
   "name" : "Legacy_Binding_Example",
   "options" : {
      "mirror_actions" : false,
      "returnBindingsWithLeftHand" : true,
      "simulated_controller_type" : "none"
    }
}

[MichauCorp]

Hello, I might be late but I wanted to ask if you managed to solve it.

I am currently working on a very similar project of my own, featuring a locomotion device, and I am struggling to make it work properly.

I used this driver as a template: https://github.com/finallyfunctional/openvr-driver-example I only slightly modified it to get input from a port, and move the joystick accordingly.

Currently, it works perfectly for legacy binding games like vrchat, but anything else just doesnt move. Since virtually our drivers are identical in how they output, i was hoping you might have some way to solve this, cause if you do it would be an enormous help.

thx in advance :)