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3D force-directed graph component in AR
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README.md

3D Force-Directed Graph in AR

NPM package Build Size Dependencies

A web component to represent a graph data structure in augmented reality using a force-directed iterative layout. Uses AR.js with A-Frame for rendering and d3-force-3d for the layout physics engine.

To load any of the examples below:

  • Open this hiro marker image in your desktop browser.
  • Open the example on your phone browser, and point it at your desktop screen.

Check out the examples:

See also the VR version, WebGL 3D version, and the A-Frame component version (aframe-forcegraph-component).

And check out the React bindings.

Quick start

import ForceGraphAR from '3d-force-graph-ar';

or

const ForceGraphAR = require('3d-force-graph-ar');

or even

<script src="//unpkg.com/3d-force-graph-ar"></script>

then

const myGraph = ForceGraphAR();
myGraph(<myDOMElement>)
    .graphData(<myData>);

Make sure to load these two script tags in your application, required for AR.js + A-frame to function properly:

<script src="//aframe.io/releases/0.9.2/aframe.min.js"></script>
<script src="//unpkg.com/ar.js/aframe/build/aframe-ar.min.js"></script>

API reference

Initialisation

ForceGraphAR({ configOptions })(<domElement>)
Config options Description Default
markerAttrs: object Set of attributes that define the marker where the force directed graph is mounted, according to the a-marker specification. { preset: 'hiro' }

Data input

Method Description Default
graphData([data]) Getter/setter for graph data structure (see below for syntax details). { nodes: [], links: [] }
jsonUrl([url]) URL of JSON file to load graph data directly from, as an alternative to specifying graphData directly.
nodeId([str]) Node object accessor attribute for unique node id (used in link objects source/target). id
linkSource([str]) Link object accessor attribute referring to id of source node. source
linkTarget([str]) Link object accessor attribute referring to id of target node. target

Container layout

Method Description Default
yOffset([number]) Getter/setter for the offset distance above the marker where to place the center coordinates <0,0,0> of the force directed graph. Measured in terms of marker width units. 1.5
glScale([number]) Getter/setter for the translation scale between real world distances and WebGL units, determining the overall size of the graph. Defined in terms of how many GL units fit in a full marker width. 200
width([px]) Getter/setter for the viewport canvas width. <window width>
height([px]) Getter/setter for the viewport canvas height. <window height>

Node styling

Method Description Default
nodeRelSize([num]) Getter/setter for the ratio of node sphere volume (cubic px) per value unit. 4
nodeVal([num, str or fn]) Node object accessor function, attribute or a numeric constant for the node numeric value (affects sphere volume). val
nodeLabel([str or fn]) Node object accessor function or attribute for name (shown in label). name
nodeDesc([str or fn]) Node object accessor function or attribute for description (shown under label). desc
nodeVisibility([boolean, str or fn]) Node object accessor function, attribute or a boolean constant for whether to display the node. true
nodeColor([str or fn]) Node object accessor function or attribute for node color (affects sphere color). color
nodeAutoColorBy([str or fn]) Node object accessor function (fn(node)) or attribute (e.g. 'type') to automatically group colors by. Only affects nodes without a color attribute.
nodeOpacity([num]) Getter/setter for the nodes sphere opacity, between [0,1]. 0.75
nodeResolution([num]) Getter/setter for the geometric resolution of each node, expressed in how many slice segments to divide the circumference. Higher values yield smoother spheres. 8
nodeThreeObject([Object3d, str or fn]) Node object accessor function or attribute for generating a custom 3d object to render as graph nodes. Should return an instance of ThreeJS Object3d. If a falsy value is returned, the default 3d object type will be used instead for that node. default node object is a sphere, sized according to val and styled according to color.
nodeThreeObjectExtend([bool, str or fn]) Node object accessor function, attribute or a boolean value for whether to replace the default node when using a custom nodeThreeObject (false) or to extend it (true). false

Link styling

Method Description Default
linkLabel([str or fn]) Link object accessor function or attribute for name (shown in label). name
linkDesc([str or fn]) Link object accessor function or attribute for description (shown under label). desc
linkVisibility([boolean, str or fn]) Link object accessor function, attribute or a boolean constant for whether to display the link line. A value of false maintains the link force without rendering it. true
linkColor([str or fn]) Link object accessor function or attribute for line color. color
linkAutoColorBy([str or fn]) Link object accessor function (fn(link)) or attribute (e.g. 'type') to automatically group colors by. Only affects links without a color attribute.
linkOpacity([num]) Getter/setter for line opacity of links, between [0,1]. 0.2
linkWidth([num, str or fn]) Link object accessor function, attribute or a numeric constant for the link line width. A value of zero will render a ThreeJS Line whose width is constant (1px) regardless of distance. Values are rounded to the nearest decimal for indexing purposes. 0
linkResolution([num]) Getter/setter for the geometric resolution of each link, expressed in how many radial segments to divide the cylinder. Higher values yield smoother cylinders. Applicable only to links with positive width. 6
linkCurvature([num, str or fn]) Link object accessor function, attribute or a numeric constant for the curvature radius of the link line. Curved lines are represented as 3D bezier curves, and any numeric value is accepted. A value of 0 renders a straight line. 1 indicates a radius equal to half of the line length, causing the curve to approximate a semi-circle. For self-referencing links (source equal to target) the curve is represented as a loop around the node, with length proportional to the curvature value. Lines are curved clockwise for positive values, and counter-clockwise for negative values. Note that rendering curved lines is purely a visual effect and does not affect the behavior of the underlying forces. 0
linkCurveRotation([num, str or fn]) Link object accessor function, attribute or a numeric constant for the rotation along the line axis to apply to the curve. Has no effect on straight lines. At 0 rotation, the curve is oriented in the direction of the intersection with the XY plane. The rotation angle (in radians) will rotate the curved line clockwise around the "start-to-end" axis from this reference orientation. 0
linkMaterial([Material, str or fn]) Link object accessor function or attribute for specifying a custom material to style the graph links with. Should return an instance of ThreeJS Material. If a falsy value is returned, the default material will be used instead for that link. default link material is MeshLambertMaterial styled according to color and opacity.
linkThreeObject([Object3d, str or fn]) Link object accessor function or attribute for generating a custom 3d object to render as graph links. Should return an instance of ThreeJS Object3d. If a falsy value is returned, the default 3d object type will be used instead for that link. default link object is a line or cylinder, sized according to width and styled according to material.
linkThreeObjectExtend([bool, str or fn]) Link object accessor function, attribute or a boolean value for whether to replace the default link when using a custom linkThreeObject (false) or to extend it (true). false
linkPositionUpdate([fn(linkObject, { start, end }, link)]) Getter/setter for the custom function to call for updating the position of links at every render iteration. It receives the respective link ThreeJS Object3d, the start and end coordinates of the link ({x,y,z} each), and the link's data. If the function returns a truthy value, the regular position update function will not run for that link.
linkHoverPrecision([int]) Whether to display the link label when gazing the link closely (low value) or from far away (high value). 2
linkDirectionalArrowLength([num, str or fn]) Link object accessor function, attribute or a numeric constant for the length of the arrow head indicating the link directionality. The arrow is displayed directly over the link line, and points in the direction of source > target. A value of 0 hides the arrow. 0
linkDirectionalArrowColor([str or fn]) Link object accessor function or attribute for the color of the arrow head. color
linkDirectionalArrowRelPos([num, str or fn]) Link object accessor function, attribute or a numeric constant for the longitudinal position of the arrow head along the link line, expressed as a ratio between 0 and 1, where 0 indicates immediately next to the source node, 1 next to the target node, and 0.5 right in the middle. 0.5
linkDirectionalArrowResolution([num]) Getter/setter for the geometric resolution of the arrow head, expressed in how many slice segments to divide the cone base circumference. Higher values yield smoother arrows. 8
linkDirectionalParticles([num, str or fn]) Link object accessor function, attribute or a numeric constant for the number of particles (small spheres) to display over the link line. The particles are distributed equi-spaced along the line, travel in the direction source > target, and can be used to indicate link directionality. 0
linkDirectionalParticleSpeed([num, str or fn]) Link object accessor function, attribute or a numeric constant for the directional particles speed, expressed as the ratio of the link length to travel per frame. Values above 0.5 are discouraged. 0.01
linkDirectionalParticleWidth([num, str or fn]) Link object accessor function, attribute or a numeric constant for the directional particles width. Values are rounded to the nearest decimal for indexing purposes. 0.5
linkDirectionalParticleColor([str or fn]) Link object accessor function or attribute for the directional particles color. color
linkDirectionalParticleResolution([num]) Getter/setter for the geometric resolution of each directional particle, expressed in how many slice segments to divide the circumference. Higher values yield smoother particles. 4

Force engine configuration

Method Description Default
forceEngine([str]) Getter/setter for which force-simulation engine to use (d3 or ngraph). d3
numDimensions([int]) Getter/setter for number of dimensions to run the force simulation on (1, 2 or 3). 3
dagMode([str]) Apply layout constraints based on the graph directionality. Only works for DAG graph structures (without cycles). Choice between td (top-down), bu (bottom-up), lr (left-to-right), rl (right-to-left), zout (near-to-far), zin (far-to-near), radialout (outwards-radially) or radialin (inwards-radially).
dagLevelDistance([num]) If dagMode is engaged, this specifies the distance between the different graph depths. auto-derived from the number of nodes
d3AlphaDecay([num]) Getter/setter for the simulation intensity decay parameter, only applicable if using the d3 simulation engine. 0.0228
d3VelocityDecay([num]) Getter/setter for the nodes' velocity decay that simulates the medium resistance, only applicable if using the d3 simulation engine. 0.4
d3Force(str, [fn]) Getter/setter for the internal forces that control the d3 simulation engine. Follows the same interface as d3-force-3d's simulation.force. Three forces are included by default: 'link' (based on forceLink), 'charge' (based on forceManyBody) and 'center' (based on forceCenter). Each of these forces can be reconfigured, or new forces can be added to the system. This method is only applicable if using the d3 simulation engine.
d3ReheatSimulation() Reheats the force simulation engine, by setting the alpha value to 1. Only applicable if using the d3 simulation engine.
warmupTicks([int]) Getter/setter for number of layout engine cycles to dry-run at ignition before starting to render. 0
cooldownTicks([int]) Getter/setter for how many build-in frames to render before stopping and freezing the layout engine. Infinity
cooldownTime([num]) Getter/setter for how long (ms) to render for before stopping and freezing the layout engine. 15000
onEngineTick(fn) Callback function invoked at every tick of the simulation engine. -
onEngineStop(fn) Callback function invoked when the simulation engine stops and the layout is frozen. -
refresh() Redraws all the nodes/links.

Input JSON syntax

{
    "nodes": [ 
        { 
          "id": "id1",
          "name": "name1",
          "val": 1 
        },
        { 
          "id": "id2",
          "name": "name2",
          "val": 10 
        },
        (...)
    ],
    "links": [
        {
            "source": "id1",
            "target": "id2"
        },
        (...)
    ]
}

Giving Back

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