Aleph is a 3D object viewer and annotation/measurement tool built with A-Frame, AMI, StencilJS, and Ionic

• Website
• Scope
• Getting Started
• Contributing
• Feedback
• Documentation
• License

Website

Visit the Aleph demo page to try it out.

Scope

• Usable as a web component within any page/framework and has a Universal Viewer integration
• Has a supporting Control Panel (a separate web component) showing associated settings for a given mesh or volume
• Straight-forward to debug, using a single source of truth and unidirectional data flow (redux)
• Themable to allow customised colour schemes (css variables)
• Encapsulates 3D rendering logic in a well-defined component model, with pre-existing community support/adoption (A-Frame)
• Utilises the component model to extensibly display 3D media file types (GLTF+DRACO, DICOM)
• Renders 3D scenes declaratively, decoupling the presentation layer from the application layer
• Permits annotation of points on a 3D mesh or volume with a title and description
• Permits measurement of lengths and angles, with the potential to be extended to areas and volumes
• Permits annotation/measurement data to be stored/retrieved as json
• Permits slice and volume views of volumetric data, with axis/slice selection and point cloud windowing controls
• Permits panning, rotating, and animated transitions between annotations/measurements
• Has "in-scene" annotation/measurement tools as opposed to overlaid, permitting future AR/VR/XR use cases

Getting Started

Clone the repository and run npm install

Dev Builds

For development with readable sources and hot reloading run:

npm run build:dev

Production Builds

For minified production builds run:

npm run build

View on localhost

npm start

Contributing

Read below to learn how to take part in improving Aleph:

• Fork the repository and run the examples from source
• Get familiar with Code of Conduct
• Read our guide to contributing
• Find an issue to work on and submit a pull request
  • First time contributing to open source? Pick a good first issue to get you familiar with GitHub contributing process.
  • First time contributing to Aleph? Pick a beginner friendly issue to get you familiar with codebase and our contributing process.
  • Want to become a Committer? Solve an issue showing that you understand Aleph objectives and architecture. Here is a good list to start.
• Could not find an issue? Look for bugs, typos, and missing features.

Feedback

Read below how to engage with Aleph community:

• Join the discussion on Slack.
• Ask a question, request a new feature and file a bug with GitHub issues.
• Star the repository to show your support.

Documentation

Web Components

• al-angle-editor
• al-console
• al-control-panel
• al-edge-editor
• al-graph-editor
• al-node-editor
• al-node-list
• al-settings
• al-tabs
• al-url-picker
• al-viewer

Aleph can be used to display GLTF files and DICOM series. GLTF can be used in conjunction with DRACO compression.

To annotate/measure an object, open the "Settings" tab in the control panel and check "Enable Node Placement". Clicking on a 3D object will create a node which can be given a title and description. Nodes can be used as points of interest or can be connected via edges. With a node selected, SHIFT + Click to create an edge between that and another node. Edges can be used for measurement and can also be labeled with a title and description. Units of measurement can be changed in the control panel. SHIFT + Click between edges to measure angles.

The two top-level web components are <al-control-panel> and <al-viewer>. <al-control-panel> wraps a tabs-based interface containing <al-url-picker>, <al-settings>, <al-graph-editor>, and <al-console>. <al-viewer> contains the A-Frame scene and all 3D rendering logic. It also contains a Redux store that acts as single source of truth for the viewer and control panel. <al-viewer> can be used independently of <al-control-panel>, which can be lazy loaded to provide additional options.

License

• MIT