3D Tiles Specification

https://docs.ogc.org/cs/22-025r4/
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3D Tiles is an OGC Community Standard specification for streaming and rendering massive 3D...
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### RegExp creation and usage examples

Source: https://docs.ogc.org/cs/22-025r4/22-025r4.html

Examples of creating regular expressions with regExp() and using test() and exec() methods. The first block shows a JSON object used as a variable in the third example. The second block demonstrates test() and exec() with flags, and the third shows a regex applied to a variable.

```json
{
    "Name" : "Building 1"
}
```

```styling
regExp('a').test('abc') === true
regExp('a(.)', 'i').exec('Abc') === 'b'
regExp('Building\s(\d)').exec(${Name}) === '1'
```

--------------------------------

### Batch Table JSON example with properties for two features

Source: https://docs.ogc.org/cs/22-025r4/22-025r4.html

Example Batch Table JSON with properties for two features, showing arrays for id, displayName, yearBuilt, and address. The address property contains an array of objects.

```json
{
    "id" : ["unique id", "another unique id"],
    "displayName" : ["Building name", "Another building name"],
    "yearBuilt" : [1999, 2015],
    "address" : [{"street" : "Main Street", "houseNumber" : "1"}, {"street" : "Main Street", "houseNumber" : "2"}]
}
```

--------------------------------

### Type conversion examples

Source: https://docs.ogc.org/cs/22-025r4/22-025r4.html

Examples of explicit type conversions using Boolean, Number, and String functions. These follow JavaScript conventions for Boolean and Number, and String conversions for String.

```styling
Boolean(1) === true
Number('1') === 1
String(1) === '1'
```

--------------------------------

### Property table JSON example with buffer views

Source: https://docs.ogc.org/cs/22-025r4/22-025r4.html

Example of a property table definition showing buffer view indices for values, stringOffsets, and arrayOffsets. The 'diameter' property is omitted as noted in the comment.

```json
{
  "propertyTables": [{
    "name": "tree_survey_2021-09-29",
    "class": "tree",
    "count": 10,
    "properties": {
      "species": {
        "values": 2,
        "stringOffsets": 3
      },
      "age": {
        "values": 1
      },
      "height": {
        "values": 0
      },
      // "diameter" is not required and has been omitted from this table.
    }
  }]
}
```

--------------------------------

### sqrt usage example

Source: https://docs.ogc.org/cs/22-025r4/22-025r4.html

Example JSON expression using sqrt in a color condition.

```json
{
    "color" : {
        "conditions" : [
            ["${temperature} >= 0.5", "color('#00FFFF')"],
            ["${temperature} >= 0.0", "color('#FF00FF')"]
        ]
    }
}
```

--------------------------------

### asin usage example

Source: https://docs.ogc.org/cs/22-025r4/22-025r4.html

Example JSON expression using asin to show features where the arcsine of Angle is greater than 0.0.

```json
{
    "show" : "asin(${Angle}) > 0.0"
}
```

--------------------------------

### Subtree JSON example with buffers, buffer views, and availability

Source: https://docs.ogc.org/cs/22-025r4/22-025r4.html

Example JSON for a subtree where all tiles are available, but not all have content and not all child subtrees are available. Shows internal and external buffers, buffer views, and availability using constants and bitstreams.

```json
{
  "buffers": [
    {
      "name": "Internal Buffer",
      "byteLength": 16
    },
    {
      "name": "External Buffer",
      "uri": "external.bin",
      "byteLength": 32
    }
  ],
  "bufferViews": [
    {
      "buffer": 0,
      "byteOffset": 0,
      "byteLength": 11
    },
    {
      "buffer": 1,
      "byteOffset": 0,
      "byteLength": 32
    }
  ],
  "tileAvailability": {
    "constant": 1,
  },
  "contentAvailability": [{
    "bitstream": 0,
    "availableCount": 60
  }],
  "childSubtreeAvailability": {
    "bitstream": 1
  }
}
```

--------------------------------

### acos usage example

Source: https://docs.ogc.org/cs/22-025r4/22-025r4.html

Example JSON expression using acos to show features where the arccosine of Angle is greater than 0.0.

```json
{
    "show" : "acos(${Angle}) > 0.0"
}
```

--------------------------------

### Feature Table JSON and binary buffer for positions only

Source: https://docs.ogc.org/cs/22-025r4/22-025r4.pdf

Minimal example placing four instances on the corners of a unit length square with default orientation. The JSON defines INSTANCES_LENGTH and POSITION byteOffset, and the binary buffer contains the position coordinates.

```javascript
var featureTableJSON = {
INSTANCES_LENGTH : 4,
POSITION : {
byteOffset : 0
}
};
var featureTableBinary = new Buffer(new Float32Array([
0.0, 0.0, 0.0,
1.0, 0.0, 0.0,
0.0, 0.0, 1.0,
1.0, 0.0, 1.0
]).buffer);
```

--------------------------------

### Construct colors and vectors from variables

Source: https://docs.ogc.org/cs/22-025r4/22-025r4.html

Examples of using variables to construct colors and vectors with rgba() and vec4() functions.

```text
rgba(${red}, ${green}, ${blue}, ${alpha})
vec4(${temperature})
```

--------------------------------

### tan usage example

Source: https://docs.ogc.org/cs/22-025r4/22-025r4.html

Example JSON expression using tan to show features where the tangent of Angle is greater than 0.0.

```json
{
    "show" : "tan(${Angle}) > 0.0"
}
```

--------------------------------

### sin usage example

Source: https://docs.ogc.org/cs/22-025r4/22-025r4.html

Example JSON expression using sin to show features where the sine of Angle is greater than 0.0.

```json
{
    "show" : "sin(${Angle}) > 0.0"
}
```

--------------------------------

### RegExp operator =~ and !~ examples

Source: https://docs.ogc.org/cs/22-025r4/22-025r4.html

Expressions that evaluate to true, demonstrating the commutative behavior of the =~ and !~ operators for regular expressions.

```styling
regExp('a') =~ 'abc'
'abc' =~ regExp('a')

regExp('a') !~ 'bcd'
'bcd' !~ regExp('a')
```

--------------------------------

### cos usage example

Source: https://docs.ogc.org/cs/22-025r4/22-025r4.html

Example JSON expression using cos to show features where the cosine of Angle is greater than 0.0.

```json
{
    "show" : "cos(${Angle}) > 0.0"
}
```
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