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import Cesium3DTilesetMetadata from "./Cesium3DTilesetMetadata.js";
import Check from "../Core/Check.js";
import Frozen from "../Core/Frozen.js";
import defined from "../Core/defined.js";
import Ellipsoid from "../Core/Ellipsoid.js";
import hasExtension from "./hasExtension.js";
import ImplicitSubtree from "./ImplicitSubtree.js";
import ImplicitSubtreeCache from "./ImplicitSubtreeCache.js";
import ImplicitTileCoordinates from "./ImplicitTileCoordinates.js";
import ImplicitTileset from "./ImplicitTileset.js";
import Matrix3 from "../Core/Matrix3.js";
import Matrix4 from "../Core/Matrix4.js";
import MetadataSemantic from "./MetadataSemantic.js";
import MetadataType from "./MetadataType.js";
import OrientedBoundingBox from "../Core/OrientedBoundingBox.js";
import preprocess3DTileContent from "./preprocess3DTileContent.js";
import Resource from "../Core/Resource.js";
import ResourceCache from "./ResourceCache.js";
import RuntimeError from "../Core/RuntimeError.js";
import VoxelContent from "./VoxelContent.js";
import VoxelMetadataOrder from "./VoxelMetadataOrder.js";
import VoxelShapeType from "./VoxelShapeType.js";
import CesiumMath from "../Core/Math.js";
import Quaternion from "../Core/Quaternion.js";
/**
* @typedef {object} Cesium3DTilesVoxelProvider.ConstructorOptions
*
* Initialization options for the Cesium3DTilesVoxelProvider constructor
*
* @property {string} className The class in the tileset schema describing voxel metadata.
* @property {string[]} names The metadata names.
* @property {MetadataType[]} types The metadata types.
* @property {MetadataComponentType[]} componentTypes The metadata component types.
* @property {VoxelShapeType} shape The {@link VoxelShapeType}.
* @property {Cartesian3} dimensions The number of voxels per dimension of a tile. This is the same for all tiles in the dataset.
* @property {Cartesian3} [paddingBefore=Cartesian3.ZERO] The number of padding voxels before the tile. This improves rendering quality when sampling the edge of a tile, but it increases memory usage.
* @property {Cartesian3} [paddingAfter=Cartesian3.ZERO] The number of padding voxels after the tile. This improves rendering quality when sampling the edge of a tile, but it increases memory usage.
* @property {Matrix4} [globalTransform=Matrix4.IDENTITY] A transform from local space to global space.
* @property {Matrix4} [shapeTransform=Matrix4.IDENTITY] A transform from shape space to local space.
* @property {Cartesian3} [minBounds] The minimum bounds.
* @property {Cartesian3} [maxBounds] The maximum bounds.
* @property {number[][]} [minimumValues] The metadata minimum values.
* @property {number[][]} [maximumValues] The metadata maximum values.
* @property {number} [maximumTileCount] The maximum number of tiles that exist for this provider. This value is used as a hint to the voxel renderer to allocate an appropriate amount of GPU memory. If this value is not known it can be undefined.
*/
/**
* A {@link VoxelProvider} that fetches voxel data from a 3D Tiles tileset.
* <p>
* Implements the {@link VoxelProvider} interface.
* </p>
* <div class="notice">
* This object is normally not instantiated directly, use {@link Cesium3DTilesVoxelProvider.fromUrl}.
* </div>
*
* @alias Cesium3DTilesVoxelProvider
* @constructor
* @augments VoxelProvider
*
* @param {Cesium3DTilesVoxelProvider.ConstructorOptions} options An object describing initialization options
*
* @see Cesium3DTilesVoxelProvider.fromUrl
* @see VoxelProvider
* @see VoxelPrimitive
* @see VoxelShapeType
*
* @experimental This feature is not final and is subject to change without Cesium's standard deprecation policy.
*/
function Cesium3DTilesVoxelProvider(options) {
options = options ?? Frozen.EMPTY_OBJECT;
const {
className,
names,
types,
componentTypes,
shape,
dimensions,
paddingBefore = Cartesian3.ZERO.clone(),
paddingAfter = Cartesian3.ZERO.clone(),
globalTransform = Matrix4.IDENTITY.clone(),
shapeTransform = Matrix4.IDENTITY.clone(),
minBounds,
maxBounds,
minimumValues,
maximumValues,
maximumTileCount,
} = options;
//>>includeStart('debug', pragmas.debug);
Check.typeOf.string("className", className);
Check.typeOf.object("names", names);
Check.typeOf.object("types", types);
Check.typeOf.object("componentTypes", componentTypes);
Check.typeOf.string("shape", shape);
Check.typeOf.object("dimensions", dimensions);
//>>includeEnd('debug');
this._shapeTransform = shapeTransform;
this._globalTransform = globalTransform;
this._shape = shape;
this._minBounds = minBounds;
this._maxBounds = maxBounds;
this._dimensions = dimensions;
this._paddingBefore = paddingBefore;
this._paddingAfter = paddingAfter;
this._className = className;
this._names = names;
this._types = types;
this._componentTypes = componentTypes;
this._metadataOrder =
shape === VoxelShapeType.ELLIPSOID
? VoxelMetadataOrder.Z_UP
: VoxelMetadataOrder.Y_UP;
this._minimumValues = minimumValues;
this._maximumValues = maximumValues;
this._maximumTileCount = maximumTileCount;
this._availableLevels = undefined;
this._implicitTileset = undefined;
this._subtreeCache = new ImplicitSubtreeCache();
}
Object.defineProperties(Cesium3DTilesVoxelProvider.prototype, {
/**
* A transform from local space to global space.
*
* @memberof Cesium3DTilesVoxelProvider.prototype
* @type {Matrix4}
* @default Matrix4.IDENTITY
* @readonly
*/
globalTransform: {
get: function () {
return this._globalTransform;
},
},
/**
* A transform from shape space to local space.
*
* @memberof Cesium3DTilesVoxelProvider.prototype
* @type {Matrix4}
* @default Matrix4.IDENTITY
* @readonly
*/
shapeTransform: {
get: function () {
return this._shapeTransform;
},
},
/**
* Gets the {@link VoxelShapeType}
*
* @memberof Cesium3DTilesVoxelProvider.prototype
* @type {VoxelShapeType}
* @readonly
*/
shape: {
get: function () {
return this._shape;
},
},
/**
* Gets the minimum bounds.
* If undefined, the shape's default minimum bounds will be used instead.
*
* @memberof Cesium3DTilesVoxelProvider.prototype
* @type {Cartesian3|undefined}
* @readonly
*/
minBounds: {
get: function () {
return this._minBounds;
},
},
/**
* Gets the maximum bounds.
* If undefined, the shape's default maximum bounds will be used instead.
*
* @memberof Cesium3DTilesVoxelProvider.prototype
* @type {Cartesian3|undefined}
* @readonly
*/
maxBounds: {
get: function () {
return this._maxBounds;
},
},
/**
* Gets the number of voxels per dimension of a tile. This is the same for all tiles in the dataset.
*
* @memberof Cesium3DTilesVoxelProvider.prototype
* @type {Cartesian3}
* @readonly
*/
dimensions: {
get: function () {
return this._dimensions;
},
},
/**
* Gets the number of padding voxels before the tile. This improves rendering quality when sampling the edge of a tile, but it increases memory usage.
*
* @memberof Cesium3DTilesVoxelProvider.prototype
* @type {Cartesian3}
* @default Cartesian3.ZERO
* @readonly
*/
paddingBefore: {
get: function () {
return this._paddingBefore;
},
},
/**
* Gets the number of padding voxels after the tile. This improves rendering quality when sampling the edge of a tile, but it increases memory usage.
*
* @memberof Cesium3DTilesVoxelProvider.prototype
* @type {Cartesian3}
* @default Cartesian3.ZERO
* @readonly
*/
paddingAfter: {
get: function () {
return this._paddingAfter;
},
},
/**
* The metadata class for this tileset.
*
* @memberof Cesium3DTilesVoxelProvider.prototype
* @type {string}
* @readonly
*/
className: {
get: function () {
return this._className;
},
},
/**
* Gets the metadata names.
*
* @memberof Cesium3DTilesVoxelProvider.prototype
* @type {string[]}
* @readonly
*/
names: {
get: function () {
return this._names;
},
},
/**
* Gets the metadata types.
*
* @memberof Cesium3DTilesVoxelProvider.prototype
* @type {MetadataType[]}
* @readonly
*/
types: {
get: function () {
return this._types;
},
},
/**
* Gets the metadata component types.
*
* @memberof Cesium3DTilesVoxelProvider.prototype
* @type {MetadataComponentType[]}
* @readonly
*/
componentTypes: {
get: function () {
return this._componentTypes;
},
},
/**
* Gets the ordering of the metadata in the buffers.
*
* @memberof Cesium3DTilesVoxelProvider.prototype
* @type {VoxelMetadataOrder}
* @readonly
* @private
*/
metadataOrder: {
get: function () {
return this._metadataOrder;
},
},
/**
* Gets the metadata minimum values.
*
* @memberof Cesium3DTilesVoxelProvider.prototype
* @type {number[][]|undefined}
* @readonly
*/
minimumValues: {
get: function () {
return this._minimumValues;
},
},
/**
* Gets the metadata maximum values.
*
* @memberof Cesium3DTilesVoxelProvider.prototype
* @type {number[][]|undefined}
* @readonly
*/
maximumValues: {
get: function () {
return this._maximumValues;
},
},
/**
* The maximum number of tiles that exist for this provider.
* This value is used as a hint to the voxel renderer to allocate an appropriate amount of GPU memory.
* If this value is not known it can be undefined.
*
* @memberof Cesium3DTilesVoxelProvider.prototype
* @type {number|undefined}
* @readonly
*/
maximumTileCount: {
get: function () {
return this._maximumTileCount;
},
},
/**
* The number of levels of detail containing available tiles in the tileset.
*
* @memberof Cesium3DTilesVoxelProvider.prototype
* @type {number|undefined}
* @readonly
*/
availableLevels: {
get: function () {
return this._availableLevels;
},
},
});
/**
* Creates a {@link Cesium3DTilesVoxelProvider} that fetches voxel data from a 3D Tiles tileset.
*
* @param {Resource|string} url The URL to a tileset JSON file
* @returns {Promise<Cesium3DTilesVoxelProvider>} The created provider
*
* @exception {RuntimeException} Root must have content
* @exception {RuntimeException} Root tile content must have 3DTILES_content_voxels extension
* @exception {RuntimeException} Root tile must have implicit tiling
* @exception {RuntimeException} Tileset must have a metadata schema
* @exception {RuntimeException} Only box, region and 3DTILES_bounding_volume_cylinder are supported in Cesium3DTilesVoxelProvider
*
* @example
* try {
* const voxelProvider = await Cesium3DTilesVoxelProvider.fromUrl(
* "http://localhost:8002/tilesets/voxel/tileset.json"
* );
* const voxelPrimitive = new VoxelPrimitive({
* provider: voxelProvider,
* customShader: customShader,
* });
* scene.primitives.add(voxelPrimitive);
* } catch (error) {
* console.error(`Error creating voxel primitive: ${error}`);
* }
*
* @see {@link VoxelPrimitive}
*/
Cesium3DTilesVoxelProvider.fromUrl = async function (url) {
//>>includeStart('debug', pragmas.debug);
Check.defined("url", url);
//>>includeEnd('debug');
const resource = Resource.createIfNeeded(url);
const tilesetJson = await resource.fetchJson();
validate(tilesetJson);
const schemaLoader = getMetadataSchemaLoader(tilesetJson, resource);
await schemaLoader.load();
const { root } = tilesetJson;
const metadataJson = hasExtension(tilesetJson, "3DTILES_metadata")
? tilesetJson.extensions["3DTILES_metadata"]
: tilesetJson;
const tilesetMetadata = new Cesium3DTilesetMetadata({
metadataJson: metadataJson,
schema: schemaLoader.schema,
});
const voxel = root.content.extensions["3DTILES_content_voxels"];
const className = voxel.class;
const providerOptions = getAttributeInfo(tilesetMetadata, className);
Object.assign(providerOptions, getShape(root));
if (defined(root.transform)) {
providerOptions.globalTransform = Matrix4.unpack(root.transform);
} else {
providerOptions.globalTransform = Matrix4.clone(Matrix4.IDENTITY);
}
providerOptions.dimensions = Cartesian3.unpack(voxel.dimensions);
providerOptions.maximumTileCount = getTileCount(tilesetMetadata);
Iif (defined(voxel.padding)) {
providerOptions.paddingBefore = Cartesian3.unpack(voxel.padding.before);
providerOptions.paddingAfter = Cartesian3.unpack(voxel.padding.after);
}
const provider = new Cesium3DTilesVoxelProvider(providerOptions);
const implicitTileset = new ImplicitTileset(
resource,
root,
schemaLoader.schema,
);
provider._implicitTileset = implicitTileset;
provider._availableLevels = implicitTileset.availableLevels;
ResourceCache.unload(schemaLoader);
return provider;
};
function getTileCount(metadata) {
Eif (!defined(metadata.tileset)) {
return undefined;
}
return metadata.tileset.getPropertyBySemantic(
MetadataSemantic.TILESET_TILE_COUNT,
);
}
function validate(tileset) {
const root = tileset.root;
Iif (!defined(root.content)) {
throw new RuntimeError("Root must have content");
}
Iif (!hasExtension(root.content, "3DTILES_content_voxels")) {
throw new RuntimeError(
"Root tile content must have 3DTILES_content_voxels extension",
);
}
Iif (
!hasExtension(root, "3DTILES_implicit_tiling") &&
!defined(root.implicitTiling)
) {
throw new RuntimeError("Root tile must have implicit tiling");
}
Iif (
!defined(tileset.schema) &&
!defined(tileset.schemaUri) &&
!hasExtension(tileset, "3DTILES_metadata")
) {
throw new RuntimeError("Tileset must have a metadata schema");
}
}
function getShape(tile) {
const boundingVolume = tile.boundingVolume;
if (defined(boundingVolume.box)) {
return getBoxShape(boundingVolume.box);
} else if (defined(boundingVolume.region)) {
return getEllipsoidShape(boundingVolume.region);
} else Eif (hasExtension(boundingVolume, "3DTILES_bounding_volume_cylinder")) {
return getCylinderShape(
boundingVolume.extensions["3DTILES_bounding_volume_cylinder"],
);
}
throw new RuntimeError(
"Only box, region and 3DTILES_bounding_volume_cylinder are supported in Cesium3DTilesVoxelProvider",
);
}
function getEllipsoidShape(region) {
const west = region[0];
const south = region[1];
const east = region[2];
const north = region[3];
const minHeight = region[4];
const maxHeight = region[5];
const shapeTransform = Matrix4.fromScale(Ellipsoid.WGS84.radii);
const minBounds = new Cartesian3(west, south, minHeight);
const maxBounds = new Cartesian3(east, north, maxHeight);
return {
shape: VoxelShapeType.ELLIPSOID,
minBounds: minBounds,
maxBounds: maxBounds,
shapeTransform: shapeTransform,
};
}
const scratchScale = new Cartesian3();
const scratchRotation = new Matrix3();
function getBoxShape(box) {
const obb = OrientedBoundingBox.unpack(box);
const scale = Matrix3.getScale(obb.halfAxes, scratchScale);
const rotation = Matrix3.getRotation(obb.halfAxes, scratchRotation);
return {
shape: VoxelShapeType.BOX,
minBounds: Cartesian3.negate(scale, new Cartesian3()),
maxBounds: Cartesian3.clone(scale),
shapeTransform: Matrix4.fromRotationTranslation(rotation, obb.center),
};
}
function getCylinderShape(cylinder) {
const {
minRadius,
maxRadius,
height,
minAngle = -CesiumMath.PI,
maxAngle = CesiumMath.PI,
translation = [0, 0, 0],
rotation = [0, 0, 0, 1],
} = cylinder;
//>>includeStart('debug', pragmas.debug);
Check.typeOf.number("minRadius", minRadius);
Check.typeOf.number("maxRadius", maxRadius);
Check.typeOf.number("height", height);
Check.typeOf.number("minAngle", minAngle);
Check.typeOf.number("maxAngle", maxAngle);
Check.typeOf.object("translation", translation);
Check.typeOf.object("rotation", rotation);
//>>includeEnd('debug');
const minHeight = -0.5 * height + translation[2];
const maxHeight = 0.5 * height + translation[2];
const shapeTransform = Matrix4.fromTranslationQuaternionRotationScale(
Cartesian3.unpack(translation),
Quaternion.unpack(rotation),
Cartesian3.ONE,
);
return {
shape: VoxelShapeType.CYLINDER,
minBounds: Cartesian3.fromElements(minRadius, minAngle, minHeight),
maxBounds: Cartesian3.fromElements(maxRadius, maxAngle, maxHeight),
shapeTransform: shapeTransform,
};
}
function getMetadataSchemaLoader(tilesetJson, resource) {
const { schemaUri, schema } = tilesetJson;
Iif (!defined(schemaUri)) {
return ResourceCache.getSchemaLoader({ schema });
}
return ResourceCache.getSchemaLoader({
resource: resource.getDerivedResource({
url: schemaUri,
}),
});
}
function getAttributeInfo(metadata, className) {
const { schema, statistics } = metadata;
const classStatistics = statistics?.classes[className];
const properties = schema.classes[className].properties;
const propertyInfo = Object.entries(properties).map(([id, property]) => {
const { type, componentType } = property;
const min = classStatistics?.properties[id].min;
const max = classStatistics?.properties[id].max;
const componentCount = MetadataType.getComponentCount(type);
const minValue = copyArray(min, componentCount);
const maxValue = copyArray(max, componentCount);
return { id, type, componentType, minValue, maxValue };
});
const names = propertyInfo.map((info) => info.id);
const types = propertyInfo.map((info) => info.type);
const componentTypes = propertyInfo.map((info) => info.componentType);
const minimumValues = propertyInfo.map((info) => info.minValue);
const maximumValues = propertyInfo.map((info) => info.maxValue);
const hasMinimumValues = minimumValues.some(defined);
return {
className,
names,
types,
componentTypes,
minimumValues: hasMinimumValues ? minimumValues : undefined,
maximumValues: hasMinimumValues ? maximumValues : undefined,
};
}
function copyArray(values, length) {
// Copy input values into a new array of a specified length.
// If the input is not an array, its value will be copied into the first element
// of the returned array. If the input is an array shorter than the returned
// array, the extra elements in the returned array will be undefined. If the
// input is undefined, the return will be undefined.
Iif (!defined(values)) {
return;
}
const valuesArray = Array.isArray(values) ? values : [values];
return Array.from({ length }, (v, i) => valuesArray[i]);
}
/**
* Get the subtree at a given subtree coordinate
* @param {VoxelProvider} provider The voxel provider
* @param {ImplicitTileCoordinates} subtreeCoord The coordinate at which to retrieve the subtree
* @returns {Promise<ImplicitSubtree>} The subtree at the given coordinate
* @private
*/
async function getSubtree(provider, subtreeCoord) {
const implicitTileset = provider._implicitTileset;
const subtreeCache = provider._subtreeCache;
// First load the subtree to check if the tile is available.
// If the subtree has been requested previously it might still be in the cache
let subtree = subtreeCache.find(subtreeCoord);
Iif (defined(subtree)) {
return subtree;
}
const subtreeRelative = implicitTileset.subtreeUriTemplate.getDerivedResource(
{
templateValues: subtreeCoord.getTemplateValues(),
},
);
const subtreeResource = implicitTileset.baseResource.getDerivedResource({
url: subtreeRelative.url,
});
const arrayBuffer = await subtreeResource.fetchArrayBuffer();
// Check one more time if the subtree is in the cache.
// This could happen if there are two in-flight tile requests from the same
// subtree and one finishes before the other.
subtree = subtreeCache.find(subtreeCoord);
if (defined(subtree)) {
return subtree;
}
const preprocessed = preprocess3DTileContent(arrayBuffer);
subtree = await ImplicitSubtree.fromSubtreeJson(
subtreeResource,
preprocessed.jsonPayload,
preprocessed.binaryPayload,
implicitTileset,
subtreeCoord,
);
subtreeCache.addSubtree(subtree);
return subtree;
}
/**
* Requests the data for a given tile.
*
* @param {object} [options] Object with the following properties:
* @param {number} [options.tileLevel=0] The tile's level.
* @param {number} [options.tileX=0] The tile's X coordinate.
* @param {number} [options.tileY=0] The tile's Y coordinate.
* @param {number} [options.tileZ=0] The tile's Z coordinate.
* @privateparam {number} [options.keyframe=0] The requested keyframe.
* @returns {Promise<VoxelContent>|undefined} A promise resolving to a VoxelContent containing the data for the tile, or undefined if the request could not be scheduled this frame.
*/
Cesium3DTilesVoxelProvider.prototype.requestData = async function (options) {
options = options ?? Frozen.EMPTY_OBJECT;
const {
tileLevel = 0,
tileX = 0,
tileY = 0,
tileZ = 0,
keyframe = 0,
} = options;
if (keyframe !== 0) {
return Promise.reject(
`3D Tiles currently doesn't support time-dynamic data.`,
);
}
// 1. Load the subtree that the tile belongs to (possibly from the subtree cache)
// 2. Load the voxel content if available
// Can't use a scratch variable here because the object is used inside the promise chain.
const implicitTileset = this._implicitTileset;
const tileCoordinates = new ImplicitTileCoordinates({
subdivisionScheme: implicitTileset.subdivisionScheme,
subtreeLevels: implicitTileset.subtreeLevels,
level: tileLevel,
x: tileX,
y: tileY,
z: tileZ,
});
// Find the coordinates of the parent subtree containing tileCoordinates
// If tileCoordinates is a subtree child, use that subtree
// If tileCoordinates is a subtree root, use its parent subtree
const isSubtreeRoot =
tileCoordinates.isSubtreeRoot() && tileCoordinates.level > 0;
const subtreeCoord = isSubtreeRoot
? tileCoordinates.getParentSubtreeCoordinates()
: tileCoordinates.getSubtreeCoordinates();
const that = this;
const subtree = await getSubtree(that, subtreeCoord);
// NOTE: these two subtree methods are ONLY used by voxels!
const isAvailable = isSubtreeRoot
? subtree.childSubtreeIsAvailableAtCoordinates
: subtree.tileIsAvailableAtCoordinates;
const available = isAvailable.call(subtree, tileCoordinates);
Iif (!available) {
return Promise.reject(
`Tile is not available at level ${tileLevel}, x ${tileX}, y ${tileY}, z ${tileZ}.`,
);
}
const { contentUriTemplates, baseResource } = implicitTileset;
const gltfRelative = contentUriTemplates[0].getDerivedResource({
templateValues: tileCoordinates.getTemplateValues(),
});
const gltfResource = baseResource.getDerivedResource({
url: gltfRelative.url,
});
return VoxelContent.fromGltf(gltfResource);
};
export default Cesium3DTilesVoxelProvider;
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