A2 - Bowling in VR

Bowling in VR

Goals

• Creating a simple bowling hall
• Grabbing the ball from a socket
• Physics of Pins including collisions
• Scoring and display
• Physics Material
• Interactive Audio

Solution

Here you can find the solution app. Download the .apk file and test it in the Quest for reference.

Additional Material

• Bowling Alley Soundscape
• Bowling Pin Sounds
• Bowling Info

Point List (max 5 points)

• App runs in VR (1 point)
• Ball can be thrown and slips nicely (1 point)
• Pins fall and make proper sounds (1 point)
• Scoring board counts (1 point)
• Extra Tasks

Instructions

Setup VR

• Do not remove ray interactors

Create App

Make World

• Add ground plane. Make it long in z direction.
• Add two lane boundaries with cubes
• Add some colors

Make Hands

• Make Cube, set color and size
• Remove box collider
• Turn cube to prefabs ‘Hands’
• Put hands as Model Prefab to Left/RightHand Controller

Make Ball

• Make Sphere, set size and color
• Add Rigidbody and enable gravity
• Add XR Grab Interactable
• Make prefab

Distance Grab and Throw Ball

• RightHandController -> XR Ray Interactor -> Enable Force Grab
• Test grab with ‘grip’ button and throw ball
• Button can be changed in RightHandController -> XR Controller (Device-based) -> Select Usage

Direct Grab

• Remove from LeftHand Controller: XR Ray Interactor, Line Renderer, XR Interactor Line Visual
• Add to LeftHand Controller: XR Direct Interactor
• Add to LeftHand Controller: Sphere Collider, set radius to 0.2, and enable ‘Is Trigger’
• Test direct grab
• (optional) Enable XR (Ray/Direct) Interactor -> Hide Controller on Select

Make Pin

• Make Cylinder, set size (e.g., 0.08, 0.2, 0.08) and color
• Add Rigidbody, set mass
• Make prefab
• Place ten pins

Make Table for the Ball

• Make Cube, place it at the side of the lane
• Place SocketInteractor on table: Create empty GameObject, add XR Socket Interactor, add Sphere Collider (enable is Trigger)
• Set Ball to XR Socket Interactor -> Starting Selected Interactable. The ball needs to be in the scene, not only a prefab.

Add Sounds for Pins

• Add to Pin Object: Audio Source Component and add pin impact sound file, disable ‘Play on Awake’
• Add to Pin Object a script “Impact Sound”
• Create variable AudioSource and connect component to script
• OnCollisionEnter play sound, (optional) use velocity to randomize volume and pitch

Add Physics Material to Ball

• Create Physics Material. Name it ‘Slip’.
• Set Dynamic and Static Friction to 0.1. Friction Combine to Minimum. Bounciness to 0.3.
• Drag Physics Material to Ball

Add Scoring Board

• Add XR -> UI Canvas, Scale Canvas to (0.01,0.01,0.01), place canvas above pins

• Add Text (Text Mesh Pro) to Canvas as a child. Name “Score”.

• Add Script “Manage Score”. Open for edit

• Add public function ‘IncreaseScore’ for counting the points

• Add function ‘UpdateText’ for changing the Text in the Canvas (use score.ToString())

• Add Script “PinFalling” to Pin

• Add “using UnityEngine.Events;” to header

• Create Unity Event

• Invoke Unity Event on collision and if the pin is standing. (This is somehow inaccurate as the pin might not fall).

• In Unity Editor, add Score to Pins' unity event

Extra Tasks

• Add Background sounds, textures to objects (0.5 points)
• Spawn new bowling ball in Socket when the ball is removed (0.5 points)
• Add sounds to bowling ball (1 point)
• Add text when all pins fall over and reset pins (1 points)