Classes
Methods
addButton(text, image, callback)
    Create and add a holographic button to the panel.
    Parameters:
| Name | Type | Description | 
|---|---|---|
| text | to be rendered on pointer over, String or array of String | |
| image | url to display over the button | |
| callback | function called on pointer down, takes the button as the argument | 
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beginUpdate(hasPrevious, hasNext, onPrevious, onNext)
    Call this before consecutive addButton calls.
    Parameters:
| Name | Type | Description | 
|---|---|---|
| hasPrevious | true if previous button is to be rendered | |
| hasNext | true if next button is to be rendered | |
| onPrevious | callback to be executed when previous button is activated | |
| onNext | callback to be executed when next button is activated | 
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buttonTextClear()
    Internally called to remove tooltip on pointer exit
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buttonTextWrite()
    Internally called to show tooltip text on pointer enter
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dispose()
    Clean up
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endUpdate()
    Call this after all buttons are added. Optionally relocates the panel.
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relocatePanel()
    Relocate panel to given distance from the camera, by default 6
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