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Styling tilesets without features #352

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Nov 15, 2018
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Styling tilesets without features #352

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6 changes: 4 additions & 2 deletions specification/Styling/README.md
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3D Tiles styles provide concise declarative styling of tileset features. A style defines expressions to evaluate the display of a feature, for example `color` (RGB and translucency) and `show` properties, often based on the feature's properties stored in the tile's [Batch Table](../TileFormats/BatchTable/README.md).

A style may be applied to a tile that doesn't contain features, in which case the tile is treated as an implicit single feature without properties.

While a style may be created for and reference properties of a tileset, a style is independent of a tileset, such that any style can be applied to any tileset.

Styles are defined with JSON and expressions written in a small subset of JavaScript augmented for styling. Additionally, the styling language provides a set of built-in functions to support common math operations.
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> * Evaluation of `isNan` and `isFinite` (GLSL 2.0+ supports `isnan` and `isinf` for these functions respectively)
> * The types `null` and `undefined`
> * Strings, including accessing object properties (`color()['r']`) and batch table values
> * Regular expressions
> * Regular expressions
> * Arrays of lengths other than 2, 3, or 4
> * Mismatched type comparisons (e.g. `1.0 === false`)
> * Array index out of bounds

## File extension and MIME type

Tileset styles use the `.json` extension and the `application/json` mime type.

## Property reference
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