Prethodna

Dalje

Exercise - Create intelligent object placements with solvers

Completed

Solvers are one of the components of the Mixed Reality Toolkit (MRTK). Let's take a look at two types of solvers and their respective functionalities.

Location of solvers in the MRTK

The MRTK's solvers are located in the MRTK SDK folder. To see the available solvers in your project, in the Project window, go to Packages > Mixed Reality Toolkit Foundation > SDK. Then select Features > Utilities > Solvers.

The Directional Indicator solver

Use the Directional Indicator solver to direct the user to objects. Here's how:

1. In the Project window, go to Assets > MRTK.Tutorials.GettingStarted > Prefabs. Drag the Chevron prefab into the Hierarchy window, and set its Transform Position to X = 0, Y = 0, Z = 2 to position it near the RoverExplorer object.

   

2. Rename the newly added Chevron object to Indicator. Then, in the Inspector window, select Add Component to add the DirectionalIndicator.

   

3. Configure the DirectionalIndicator and SolverHandler components as follows:

   a. Verify that the SolverHandler component's Tracked Target Type is set to Head.

   b. Assign the RoverExplorer to the DirectionalIndicator component's Directional Target, by dragging it from Hierarchy into the None (Transform) field.

   c. Change the View Offset to 0.2.

   

4. To enter Game mode, press Play. Press and hold the right mouse button while moving your mouse to the left or right to rotate your gaze direction.

   Notice that when you look away from the RoverExplorer object, the Indicator object will appear and point toward the RoverExplorer object.

   

The Tap To Place solver

Use the Tap To Place solver to reposition objects. Here's how:

1. In the Hierarchy window, select the RoverExplorer > RoverAssembly object. Then, in Inspector, use Add Component to add the Tap To Place (Script) component. Configure the component as follows:

   a. Verify that the SolverHandler component's Tracked Target Type is set to Head.

   b. Clear Use Default Surface Normal Offset, and ensure that Surface Normal Offset is set to 0.

   c. Select the Keep Orientation Vertical checkbox.

   d. From the Magnetic Surfaces > Element 0 dropdown list, clear all options except Spatial Awareness.

   

2. With the RoverAssembly object still selected in the Hierarchy window, in the Inspector window, locate the On Placing Started () event. Select the + icon to add a new event.

   

3. Configure the event as follows:

   a. Assign the RoverAssembly object as a listener for the On Placing Started () event, by dragging it from Hierarchy into the None (Object) field.

   b. From the No Function dropdown list, select TapToPlace > float SurfaceNormalOffset to update the SurfaceNormalOffset property value when the event is triggered.

   c. Verify that the argument is set to 0.

   

4. In Hierarchy, right-click on an empty spot. Select 3D Object > Cube to create a temporary object representing the ground, and configure the Transform component as follows:

   • Position: X = 0, Y = -1.65, Z = 6
   • Rotation: X = 0, Y = 0, Z = 0
   • Scale: X = 10, Y = 0.2, Z = 10

   

5. With the temporary Cube still selected in Hierarchy, in the Inspector window, use the Layers dropdown list to change the Cube's Layer setting. You want to include only the Spatial Awareness layer.

   

6. To enter Game mode, press Play. Then press and hold the right mouse button while moving your mouse down, until the gaze hits the RoverAssembly object.

   

7. Click the left mouse button to start the tap-to-place process.

   

8. Press and hold the right mouse button while moving your mouse to the left or right to rotate your gaze direction. When you're happy with the placement, click the left mouse button.

   

9. When you're done testing the feature in Game mode, right-click on the Cube object, and select Delete to remove it from the scene.

   

Continue