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Transitions are commonly seen in novels and short fiction, as a gap spanning one or more lines, marking text divisions or signaling changes in subject, time, point of view, or emphasis.

Explicit markup blocks are used for constructs which float (footnotes), have no direct paper-document representation (hyperlink targets, comments), or require specialized processing (directives). They all begin with two periods and whitespace, the "explicit markup start".

The numbering of auto-numbered footnotes is determined by the order of the footnotes, not of the references. For auto-numbered footnote references without autonumber labels (" [#]_ "), the references and footnotes must be in the same relative order. Similarly for auto-symbol footnotes (" [*]_ ").

" Fold-in " is the representation typically used in HTML documents (think of the indirect hyperlink being "folded in" like ingredients into a cake), and " call-out " is more suitable for printed documents, where the link needs to be presented explicitly, for example as a footnote. You can force usage of the call-out form by using the " target-notes " directive.

reStructuredText also provides for embedded URIs ( details ), a convenience at the expense of readability. A hyperlink reference may directly embed a target URI inline, within angle brackets. The following is exactly equivalent to the example above:

The second hyperlink target (the line beginning with " __ ") is both an indirect hyperlink target ( indirectly pointing at the Python website via the " Python_ " reference) and an anonymous hyperlink target . In the text, a double-underscore suffix is used to indicate an anonymous hyperlink reference . In an anonymous hyperlink target, the reference text is not repeated. This is useful for references with long text or throw-away references, but the target should be kept close to the reference to prevent them going out of sync.

Section titles, footnotes, and citations automatically generate hyperlink targets (the title text or footnote/citation label is used as the hyperlink name).

Directives are a general-purpose extension mechanism, a way of adding support for new constructs without adding new syntax. For a description of all standard directives, see reStructuredText Directives .

Substitutions are like inline directives, allowing graphics and arbitrary constructs within text.

Any text which begins with an explicit markup start but doesn't use the syntax of any of the constructs above, is a comment.

Users who have questions or need assistance with Docutils or reStructuredText should post a message to the Docutils-Users mailing list . The Docutils project web site has more information.

To add gaze-based interaction, we need to add or implement a component. A-Frame comes with a cursor component that provides gaze-based interaction if attached to the camera:

Remix this event set component example on Glitch .

Now let’s handle the events that the cursor component provides. The cursor component emits synthetic events like click , mouseenter , mouseleave , mousedown , mouseup , and fusing . We named them similarly to the browser’s native events to be familiar for newcomers, but again note they are synthetic events.

For basic event handler where we listen to an event and set a property in response, we can use the striped panel dress Red Yohji Yamamoto Buy Cheap The Cheapest dkeJFRTlzq
. The event-set component makes basic event handlers declarative. The API for the event-set component looks like:

The __${id} piece lets us attach multiple event-set components on the same entity. We provide ${eventName} for which event the instance will handle. And then we pass property names and values that we want to set when the event occurs on or from the entity.

For example, to make an entity visible when it’s hovered over or looked at. The cursor component provides the mouseenter event:

If we want to change the color of a box on hover and restore it when no longer hovering:

The event-set component can also target other entities using _target: ${selector} . If we want to display a text label when an entity is hovered over:

The event-set component also works with components that have multiple properties using A-Frame component dot syntax (i.e., ${componentName}.${propertyName} ):

Remix this cursor handler example on Glitch

The event set component is good for basic setting operations, but it is important to know how to handle events in JavaScript. We might want to do more complex operations (e.g., make API calls, store data, affect the application state) in response to events. For those cases, we’ll need to use JavaScript, and for A-Frame, we prescribe that code be placed within A-Frame components .

To demonstrate what the event set component does under the hood, let’s have a box change color on hover and on leaving hover with JavaScript:

While we do a simple .setAttribute , we could technically do anything within the component in response to the event since we have full access to JavaScript, three.js, and Web APIs.

We’ll move onto describing and implementing interactivity for VR controllers, but the concepts of events and event listeners will still apply.

Controllers are vital for immersing people into a VR application. The potential of VR is not met without them, namely controllers that provide six degrees of freedom (6DoF). With controllers, people can reach out and around the scene and interact with objects with their hands.

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