Scaled World Grab
Overview
For scaled-world grab, the user selects an object far away from them using a long-distance interaction technique (In our case, ray-casting). On selection the entire world will be scaled around the user (without affecting the users viewpoint). This gives the illusion of the user being a giant and using simple touch the user can grab the now-close object and manipulate it around the world with ease.
Current implementation of Scaled-World Grab as of 2/06/2018
(NOTE: This may be modified/changed later)
Source paper of the technique:
Mine, M. (1997). “ISAAC: A Meta-CAD System for Virtual Environments.” Computer-Aided Design 29(8): 547–553.
Use by manually attaching
To manually attach the Scaled World Grab to the Camerarig VR components if the auto-attach fails for each hand:
- Drag onto Scaled World Grab script:
- Left and Right VR Controllers onto Left and Right Controller
- Camera eye onto camera head
- Camera right onto camera rig
Inspector parameters
For Scaled World Grab Script:
| Parameter | Default | Description |
|---|---|---|
| Intractable Layer | PickableObject | The layers that the technique can interact with |
| Interaction Type | Selection | When set to manipulation Scaled world grab can move objects via parenting. When pure selection it will just send an event that it has selected and place the object into a public variable. |
| Controller Picked | Right_Controller | The controller the technique uses |
| Selected Object | None | Object selected by technique |
For Controller Collider Script:
| Parameter | Default | Description |
|---|---|---|
| Scaled World Grab | None | The Scaled world grab script, this will be set up on run time. |
| Selected Object() | Empty | Invoked when object is selected |
| Dropped Object() | Empty | Invoked when object is Dropped |
| Hovered() | Empty | Event Invoked when an object is hovered over |
| UnHovered() | Empty | Event Invoked when an object ceases being hovered over |
| Scale Selected | None | Object selected in scale mode |
Test/Example scenes
Major example scene under:
- Assets/Technique Example Scenes/Scenes/ScaledWorldGrab