aframe-troika-text
Advanced tools
This package provides an A-Frame component and primitive for rendering three-dimensional text using Troika's text renderer.
It has similar performance and quality to A-Frame's built-in SDF text component, but brings some additional advantages:
It reads font files directly (ttf, otf, woff) and does not require using an external tool to pre-generate SDF textures with the glyphs you think you'll need.
It supports ligatures so you can use fonts like Material Icons.
Rather than using a fully custom shader, it patches the built-in Three.js material shaders as needed, so you don't lose all the nice standard shader features like lighting and fog.
This package registers both a component (<a-entity troika-text="value:Hello" />) and a primitive (<a-troika-text value="Hello"></a-troika-text>). Use whichever is most convenient for you.
I've attempted to keep the API as close as possible to that of A-Frame's default text component and a-text primitive, however some things don't quite map exactly.
| Property on component | Attribute on primitive | Description | Default Value |
|---|---|---|---|
| align | align | Multi-line text alignment (left, center, right, justify). | left |
| anchor | anchor | Horizontal positioning (left, center, right, align). | center |
| baseline | baseline | Vertical positioning (top, center, bottom). | center |
| clipRect | clip-rect | Four comma- or space-separated numbers defining a rectangle (minX, minY, maxX, maxY) outside which pixels will be hidden. | no clipping |
| color | color | Text color. This is a shortcut for specifying a custom material. | white |
| depthOffset | depth-offset | Depth buffer offset to help prevent z-fighting. Negative numbers are closer to camera, positives further. | 0 |
| font | font | URL to a font file - can be a .ttf, .otf, or .woff (no .woff2) | Roboto loaded from Google Fonts |
| fontSize | font-size | Em-height at which to render the font, in meters. | 0.2 |
| letterSpacing | letter-spacing | Letter spacing in meters. | 0 |
| lineHeight | line-height | Line height as a multiple of the fontSize. | derived from font metrics |
| maxWidth | max-width | Maximum width of the text block at which text will start wrapping, in meters. | Infinity (no wrapping) |
| outlineColor | outline-color | Color of an outline drawn around the glyph paths. | black |
| outlineWidth | outline-width | Width of an outline drawn around the glyph paths, as a number in meters or a percentage of the font-size. | 0 |
| overflowWrap | overflow-wrap | Controls how text wraps: "normal" to break at whitespace characters, or "break-word" to break within words. | normal |
| value | value | The actual content of the text. Line breaks and tabs are supported with \n and \t. | '' |
| textIndent | text-indent | Width of an indentation space to be added before the first character of a line. | 0 |
| whiteSpace | white-space | How whitespace should be handled (i.e., normal, nowrap). | normal (behaves like pre-wrap) |
Note: It does not currently follow how the built-in text component interacts with a geometry component for auto-sizing and anchoring. I think that's a nice feature so it's probably worth adding; in the meantime just use the maxWidth and anchor/baseline attributes to control it manually.
By default the text will render using a MeshBasicMaterial using the color property described in the table above. But you can also change the material to gain more advanced shader features such as physically-based lighting.
If you are using the <a-troika-text> primitive, you can assign it a material component just as you would any other entity.
<a-troika-text
value="Hello!"
material="shader: standard; metalness: 0.8;"
></a-troika-text>
If you are using the troika-text="..." component, you must instead give it a troika-text-material="..." attribute to distinguish the text material from the entity's main material. You can pass it anything supported by the built in material component.
<a-entity
troika-text="value: Hello!"
troika-text-material="shader: standard; metalness: 0.8;"
></a-entity>
Install and use by directly including the browser files:
<head>
<title>My A-Frame Scene</title>
<script src="https://aframe.io/releases/1.0.4/aframe.min.js"></script>
<script src="https://unpkg.com/aframe-troika-text/dist/aframe-troika-text.min.js"></script>
</head>
<body>
<a-scene>
<!-- As a component: -->
<a-entity troika-text="value: Hello world!"></a-entity>
<!-- As a primitive: -->
<a-troika-text value="Hello world!"></a-troika-text>
</a-scene>
</body>
Install via npm:
npm install aframe-troika-text
Then require and use.
require('aframe');
require('aframe-troika-text');
FAQs
An A-Frame component to render text using the Troika 3D text renderer
The npm package aframe-troika-text receives a total of 650 weekly downloads. As such, aframe-troika-text popularity was classified as not popular.
We found that aframe-troika-text demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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