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302x 302x 1x 314x 313x 312x 311x 310x 1x 310x 37x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 1x 1x 1x 273x 136x 136x 136x 136x 136x 136x 136x 136x 136x 136x 1868x 1868x 1x 1x 1x 1x 1x 1x 1x 1x 1x 45x 45x 1x 1x 1x | import Cartesian3 from "../Core/Cartesian3.js";
import Check from "../Core/Check.js";
import clone from "../Core/clone.js";
import combine from "../Core/combine.js";
import defined from "../Core/defined.js";
import destroyObject from "../Core/destroyObject.js";
import DeveloperError from "../Core/DeveloperError.js";
import CesiumMath from "../Core/Math.js";
import HilbertOrder from "../Core/HilbertOrder.js";
import Matrix3 from "../Core/Matrix3.js";
import Rectangle from "../Core/Rectangle.js";
import S2Cell from "../Core/S2Cell.js";
import ImplicitSubtree from "./ImplicitSubtree.js";
import hasExtension from "./hasExtension.js";
import MetadataSemantic from "./MetadataSemantic.js";
import BoundingVolumeSemantics from "./BoundingVolumeSemantics.js";
/**
* A specialized {@link Cesium3DTileContent} that lazily evaluates an implicit
* tileset. It is somewhat similar in operation to a
* {@link Tileset3DTileContent} in that once the content is constructed, it
* updates the tileset tree with more tiles. However, unlike external tilesets,
* child subtrees are represented as additional placeholder nodes with
* Implicit3DTileContent.
* <p>
* Implements the {@link Cesium3DTileContent} interface.
* </p>
* This object is normally not instantiated directly, use {@link Implicit3DTileContent.fromSubtreeJson}.
*
* @alias Implicit3DTileContent
* @constructor
*
* @param {Cesium3DTileset} tileset The tileset this content belongs to
* @param {Cesium3DTile} tile The tile this content belongs to.
* @param {Resource} resource The resource for the tileset
* @param {object} [json] The JSON object containing the subtree. Mutually exclusive with arrayBuffer.
* @param {ArrayBuffer} [arrayBuffer] The array buffer that stores the content payload. Mutually exclusive with json.
* @param {number} [byteOffset=0] The offset into the array buffer, if one was provided
*
* @exception {DeveloperError} One of json and arrayBuffer must be defined.
*
* @private
* @experimental This feature is using part of the 3D Tiles spec that is not final and is subject to change without Cesium's standard deprecation policy.
*/
function Implicit3DTileContent(tileset, tile, resource) {
//>>includeStart('debug', pragmas.debug);
Check.defined("tile.implicitTileset", tile.implicitTileset);
Check.defined("tile.implicitCoordinates", tile.implicitCoordinates);
//>>includeEnd('debug');
const implicitTileset = tile.implicitTileset;
const implicitCoordinates = tile.implicitCoordinates;
this._implicitTileset = implicitTileset;
this._implicitCoordinates = implicitCoordinates;
this._implicitSubtree = undefined;
this._tileset = tileset;
this._tile = tile;
this._resource = resource;
this._metadata = undefined;
this.featurePropertiesDirty = false;
this._group = undefined;
const templateValues = implicitCoordinates.getTemplateValues();
const subtreeResource = implicitTileset.subtreeUriTemplate.getDerivedResource(
{
templateValues: templateValues,
},
);
this._url = subtreeResource.getUrlComponent(true);
this._ready = false;
}
Object.defineProperties(Implicit3DTileContent.prototype, {
featuresLength: {
get: function () {
return 0;
},
},
pointsLength: {
get: function () {
return 0;
},
},
trianglesLength: {
get: function () {
return 0;
},
},
geometryByteLength: {
get: function () {
return 0;
},
},
texturesByteLength: {
get: function () {
return 0;
},
},
batchTableByteLength: {
get: function () {
return 0;
},
},
innerContents: {
get: function () {
return undefined;
},
},
/**
* Returns true when the tile's content is ready to render; otherwise false
*
* @memberof Implicit3DTileContent.prototype
*
* @type {boolean}
* @readonly
* @private
*/
ready: {
get: function () {
return this._ready;
},
},
tileset: {
get: function () {
return this._tileset;
},
},
tile: {
get: function () {
return this._tile;
},
},
url: {
get: function () {
return this._url;
},
},
/**
* Part of the {@link Cesium3DTileContent} interface. <code>Implicit3DTileContent</code>
* always returns <code>undefined</code>. Only transcoded tiles have content metadata.
* @memberof Implicit3DTileContent.prototype
* @private
*/
metadata: {
get: function () {
return undefined;
},
set: function () {
//>>includeStart('debug', pragmas.debug);
throw new DeveloperError("Implicit3DTileContent cannot have metadata");
//>>includeEnd('debug');
},
},
batchTable: {
get: function () {
return undefined;
},
},
group: {
get: function () {
return this._group;
},
set: function (value) {
this._group = value;
},
},
});
/**
* Initialize the implicit content by parsing the subtree resource and setting
* up a promise chain to expand the immediate subtree.
*
* @param {Cesium3DTileset} tileset The tileset this content belongs to
* @param {Cesium3DTile} tile The tile this content belongs to.
* @param {Resource} resource The resource for the tileset
* @param {object} [json] The JSON containing the subtree. Mutually exclusive with arrayBuffer.
* @param {ArrayBuffer} [arrayBuffer] The ArrayBuffer containing a subtree binary. Mutually exclusive with json.
* @param {number} [byteOffset=0] The byte offset into the arrayBuffer
* @return {Promise<Implicit3DTileContent>}
*
* @exception {DeveloperError} One of json and arrayBuffer must be defined.
*
* @private
*/
Implicit3DTileContent.fromSubtreeJson = async function (
tileset,
tile,
resource,
json,
arrayBuffer,
byteOffset,
) {
//>>includeStart('debug', pragmas.debug);
Check.defined("tile.implicitTileset", tile.implicitTileset);
Check.defined("tile.implicitCoordinates", tile.implicitCoordinates);
Iif (defined(json) === defined(arrayBuffer)) {
throw new DeveloperError("One of json and arrayBuffer must be defined.");
}
//>>includeEnd('debug');
byteOffset = byteOffset ?? 0;
let uint8Array;
if (defined(arrayBuffer)) {
uint8Array = new Uint8Array(arrayBuffer, byteOffset);
}
const implicitTileset = tile.implicitTileset;
const implicitCoordinates = tile.implicitCoordinates;
const subtree = await ImplicitSubtree.fromSubtreeJson(
resource,
json,
uint8Array,
implicitTileset,
implicitCoordinates,
);
const content = new Implicit3DTileContent(tileset, tile, resource);
content._implicitSubtree = subtree;
expandSubtree(content, subtree);
content._ready = true;
return content;
};
/**
* Expand a single subtree placeholder tile. This transcodes the subtree into
* a tree of {@link Cesium3DTile}. The root of this tree is stored in
* the placeholder tile's children array. This method also creates placeholder
* tiles for the child subtrees to be lazily expanded as needed.
*
* @param {Implicit3DTileContent} content The content
* @param {ImplicitSubtree} subtree The parsed subtree
* @private
*/
function expandSubtree(content, subtree) {
const placeholderTile = content._tile;
// Parse the tiles inside this immediate subtree
const childIndex = content._implicitCoordinates.childIndex;
const results = transcodeSubtreeTiles(
content,
subtree,
placeholderTile,
childIndex,
);
const statistics = content._tileset.statistics;
// Link the new subtree to the existing placeholder tile.
placeholderTile.children.push(results.rootTile);
statistics.numberOfTilesTotal++;
// for each child subtree, make new placeholder tiles
const childSubtrees = listChildSubtrees(content, subtree, results.bottomRow);
for (let i = 0; i < childSubtrees.length; i++) {
const subtreeLocator = childSubtrees[i];
const leafTile = subtreeLocator.tile;
const implicitChildTile = makePlaceholderChildSubtree(
content,
leafTile,
subtreeLocator.childIndex,
);
leafTile.children.push(implicitChildTile);
statistics.numberOfTilesTotal++;
}
}
/**
* A pair of (tile, childIndex) used for finding child subtrees.
*
* @typedef {object} ChildSubtreeLocator
* @property {Cesium3DTile} tile One of the tiles in the bottommost row of the subtree.
* @property {number} childIndex The morton index of the child tile relative to its parent
* @private
*/
/**
* Determine what child subtrees exist and return a list of information
*
* @param {Implicit3DTileContent} content The implicit content
* @param {ImplicitSubtree} subtree The subtree for looking up availability
* @param {Array<Cesium3DTile|undefined>} bottomRow The bottom row of tiles in a transcoded subtree
* @returns {ChildSubtreeLocator[]} A list of identifiers for the child subtrees.
* @private
*/
function listChildSubtrees(content, subtree, bottomRow) {
const results = [];
const branchingFactor = content._implicitTileset.branchingFactor;
for (let i = 0; i < bottomRow.length; i++) {
const leafTile = bottomRow[i];
if (!defined(leafTile)) {
continue;
}
for (let j = 0; j < branchingFactor; j++) {
const index = i * branchingFactor + j;
if (subtree.childSubtreeIsAvailableAtIndex(index)) {
results.push({
tile: leafTile,
childIndex: j,
});
}
}
}
return results;
}
/**
* Results of transcodeSubtreeTiles, containing the root tile of the
* subtree and the bottom row of nodes for further processing.
*
* @typedef {object} TranscodedSubtree
* @property {Cesium3DTile} rootTile The transcoded root tile of the subtree
* @property {Array<Cesium3DTile|undefined>} bottomRow The bottom row of transcoded tiles. This is helpful for processing child subtrees
* @private
*/
/**
* Transcode the implicitly-defined tiles within this subtree and generate
* explicit {@link Cesium3DTile} objects. This function only transcode tiles,
* child subtrees are handled separately.
*
* @param {Implicit3DTileContent} content The implicit content
* @param {ImplicitSubtree} subtree The subtree to get availability information
* @param {Cesium3DTile} placeholderTile The placeholder tile, used for constructing the subtree root tile
* @param {number} childIndex The Morton index of the root tile relative to parentOfRootTile
* @returns {TranscodedSubtree} The newly created subtree of tiles
* @private
*/
function transcodeSubtreeTiles(content, subtree, placeholderTile, childIndex) {
const rootBitIndex = 0;
const rootParentIsPlaceholder = true;
const rootTile = deriveChildTile(
content,
subtree,
placeholderTile,
childIndex,
rootBitIndex,
rootParentIsPlaceholder,
);
const statistics = content._tileset.statistics;
// Sliding window over the levels of the tree.
// Each row is branchingFactor * length of previous row
// Tiles within a row are ordered by Morton index.
let parentRow = [rootTile];
let currentRow = [];
const implicitTileset = content._implicitTileset;
for (let level = 1; level < implicitTileset.subtreeLevels; level++) {
const levelOffset = subtree.getLevelOffset(level);
const numberOfChildren = implicitTileset.branchingFactor * parentRow.length;
for (
let childMortonIndex = 0;
childMortonIndex < numberOfChildren;
childMortonIndex++
) {
const childBitIndex = levelOffset + childMortonIndex;
if (!subtree.tileIsAvailableAtIndex(childBitIndex)) {
currentRow.push(undefined);
continue;
}
const parentMortonIndex = subtree.getParentMortonIndex(childMortonIndex);
const parentTile = parentRow[parentMortonIndex];
const childChildIndex =
childMortonIndex % implicitTileset.branchingFactor;
const childTile = deriveChildTile(
content,
subtree,
parentTile,
childChildIndex,
childBitIndex,
);
parentTile.children.push(childTile);
statistics.numberOfTilesTotal++;
currentRow.push(childTile);
}
parentRow = currentRow;
currentRow = [];
}
return {
rootTile: rootTile,
// At the end of the last loop, bottomRow was moved to parentRow
bottomRow: parentRow,
};
}
function getGeometricError(tileMetadata, implicitTileset, implicitCoordinates) {
const semantic = MetadataSemantic.TILE_GEOMETRIC_ERROR;
if (defined(tileMetadata) && tileMetadata.hasPropertyBySemantic(semantic)) {
return tileMetadata.getPropertyBySemantic(semantic);
}
return (
implicitTileset.geometricError / Math.pow(2, implicitCoordinates.level)
);
}
/**
* Given a parent tile and information about which child to create, derive
* the properties of the child tile implicitly.
* <p>
* This creates a real tile for rendering, not a placeholder tile like some of
* the other methods of ImplicitTileset.
* </p>
*
* @param {Implicit3DTileContent} implicitContent The implicit content
* @param {ImplicitSubtree} subtree The subtree the child tile belongs to
* @param {Cesium3DTile} parentTile The parent of the new child tile
* @param {number} childIndex The morton index of the child tile relative to its parent
* @param {number} childBitIndex The index of the child tile within the tile's availability information.
* @param {boolean} [parentIsPlaceholderTile=false] True if parentTile is a placeholder tile. This is true for the root of each subtree.
* @returns {Cesium3DTile} The new child tile.
* @private
*/
function deriveChildTile(
implicitContent,
subtree,
parentTile,
childIndex,
childBitIndex,
parentIsPlaceholderTile,
) {
const implicitTileset = implicitContent._implicitTileset;
let implicitCoordinates;
if (parentIsPlaceholderTile ?? false) {
implicitCoordinates = parentTile.implicitCoordinates;
} else {
implicitCoordinates =
parentTile.implicitCoordinates.getChildCoordinates(childIndex);
}
// Parse metadata and bounding volume semantics at the beginning
// as the bounding volumes are needed below.
let tileMetadata;
let tileBounds;
if (defined(subtree.tilePropertyTableJson)) {
tileMetadata = subtree.getTileMetadataView(implicitCoordinates);
tileBounds = BoundingVolumeSemantics.parseAllBoundingVolumeSemantics(
"TILE",
tileMetadata,
);
}
// Content is not loaded at this point, so this flag is set for future reference.
const contentPropertyTableJsons = subtree.contentPropertyTableJsons;
const length = contentPropertyTableJsons.length;
let hasImplicitContentMetadata = false;
for (let i = 0; i < length; i++) {
Eif (subtree.contentIsAvailableAtCoordinates(implicitCoordinates, i)) {
hasImplicitContentMetadata = true;
break;
}
}
const boundingVolume = getTileBoundingVolume(
implicitTileset,
implicitCoordinates,
childIndex,
parentIsPlaceholderTile,
parentTile,
tileBounds,
);
const contentJsons = [];
for (let i = 0; i < implicitTileset.contentCount; i++) {
if (!subtree.contentIsAvailableAtIndex(childBitIndex, i)) {
continue;
}
const childContentTemplate = implicitTileset.contentUriTemplates[i];
const childContentUri = childContentTemplate.getDerivedResource({
templateValues: implicitCoordinates.getTemplateValues(),
}).url;
const contentJson = {
uri: childContentUri,
};
let contentBounds;
if (subtree.contentPropertyTableJsons.length > 0) {
const contentMetadata = subtree.getContentMetadataView(
implicitCoordinates,
i,
);
contentBounds = BoundingVolumeSemantics.parseAllBoundingVolumeSemantics(
"CONTENT",
contentMetadata,
);
}
const contentBoundingVolume = getContentBoundingVolume(
boundingVolume,
contentBounds,
);
if (defined(contentBoundingVolume)) {
contentJson.boundingVolume = contentBoundingVolume;
}
// combine() is used to pass through any additional properties the
// user specified such as extras or extensions
contentJsons.push(combine(contentJson, implicitTileset.contentHeaders[i]));
}
const childGeometricError = getGeometricError(
tileMetadata,
implicitTileset,
implicitCoordinates,
);
const tileJson = {
boundingVolume: boundingVolume,
geometricError: childGeometricError,
refine: implicitTileset.refine,
contents: contentJsons,
};
// combine() is used to pass through any additional properties the
// user specified such as extras or extensions.
const deep = true;
const rootHeader = clone(implicitTileset.tileHeader, deep);
// The bounding volume was computed above since it may come from metadata
// in the subtree file.
delete rootHeader.boundingVolume;
// Copying the transform to all the transcoded tiles would cause the transform
// to be applied multiple times. Removing it from the header avoids this issue.
delete rootHeader.transform;
// The implicit tiling spec does not specify what should happen if explicit
// tile metadata is added to the placeholder tile. Since implicit tile
// metadata comes from the subtree file, ignore the explicit version.
//
// Also, when a property with the semantic TILE_BOUNDING_VOLUME is added to
// the placeholder tile to set a tight bounding volume (See Cesium3DTile.js)
// propagating it to transcoded tiles causes transcoded tiles to use the
// wrong bounding volume, this can lead to loading far too many tiles.
delete rootHeader.metadata;
const combinedTileJson = combine(tileJson, rootHeader, deep);
const childTile = makeTile(
implicitContent,
implicitTileset.baseResource,
combinedTileJson,
parentTile,
);
childTile.implicitCoordinates = implicitCoordinates;
childTile.implicitSubtree = subtree;
childTile.metadata = tileMetadata;
childTile.hasImplicitContentMetadata = hasImplicitContentMetadata;
return childTile;
}
/**
* Checks whether the bounding volume's heights can be updated.
* Returns true if the minimumHeight/maximumHeight parameter
* is defined and the bounding volume is a region or S2 cell.
*
* @param {object} [boundingVolume] The bounding volume
* @param {object} [tileBounds] The tile bounds
* @param {number} [tileBounds.minimumHeight] The minimum height
* @param {number} [tileBounds.maximumHeight] The maximum height
* @returns {boolean} Whether the bounding volume's heights can be updated
* @private
*/
function canUpdateHeights(boundingVolume, tileBounds) {
return (
defined(boundingVolume) &&
defined(tileBounds) &&
(defined(tileBounds.minimumHeight) || defined(tileBounds.maximumHeight)) &&
(hasExtension(boundingVolume, "3DTILES_bounding_volume_S2") ||
defined(boundingVolume.region))
);
}
/**
* Update the minimum and maximum height of the bounding volume.
* This is typically used to tighten a bounding volume using the
* <code>TILE_MINIMUM_HEIGHT</code> and <code>TILE_MAXIMUM_HEIGHT</code>
* semantics. Heights are only updated if the respective
* minimumHeight/maximumHeight parameter is defined and the
* bounding volume is a region or S2 cell.
*
* @param {object} boundingVolume The bounding volume
* @param {object} [tileBounds] The tile bounds
* @param {number} [tileBounds.minimumHeight] The new minimum height
* @param {number} [tileBounds.maximumHeight] The new maximum height
* @private
*/
function updateHeights(boundingVolume, tileBounds) {
if (!defined(tileBounds)) {
return;
}
if (hasExtension(boundingVolume, "3DTILES_bounding_volume_S2")) {
updateS2CellHeights(
boundingVolume.extensions["3DTILES_bounding_volume_S2"],
tileBounds.minimumHeight,
tileBounds.maximumHeight,
);
} else if (defined(boundingVolume.region)) {
updateRegionHeights(
boundingVolume.region,
tileBounds.minimumHeight,
tileBounds.maximumHeight,
);
}
}
/**
* For a bounding region, update the minimum and maximum height. This
* is typically used to tighten a bounding volume using the
* <code>TILE_MINIMUM_HEIGHT</code> and <code>TILE_MAXIMUM_HEIGHT</code>
* semantics. Heights are only updated if the respective
* minimumHeight/maximumHeight parameter is defined.
*
* @param {Array} region A 6-element array describing the bounding region
* @param {number} [minimumHeight] The new minimum height
* @param {number} [maximumHeight] The new maximum height
* @private
*/
function updateRegionHeights(region, minimumHeight, maximumHeight) {
if (defined(minimumHeight)) {
region[4] = minimumHeight;
}
if (defined(maximumHeight)) {
region[5] = maximumHeight;
}
}
/**
* For a bounding S2 cell, update the minimum and maximum height. This
* is typically used to tighten a bounding volume using the
* <code>TILE_MINIMUM_HEIGHT</code> and <code>TILE_MAXIMUM_HEIGHT</code>
* semantics. Heights are only updated if the respective
* minimumHeight/maximumHeight parameter is defined.
*
* @param {object} s2CellVolume An object describing the S2 cell
* @param {number} [minimumHeight] The new minimum height
* @param {number} [maximumHeight] The new maximum height
* @private
*/
function updateS2CellHeights(s2CellVolume, minimumHeight, maximumHeight) {
Eif (defined(minimumHeight)) {
s2CellVolume.minimumHeight = minimumHeight;
}
Eif (defined(maximumHeight)) {
s2CellVolume.maximumHeight = maximumHeight;
}
}
/**
* Gets the tile's bounding volume, which may be specified via
* metadata semantics such as TILE_BOUNDING_BOX or implicitly
* derived from the implicit root tile's bounding volume.
* <p>
* Priority of bounding volume types:
* <ol>
* <li>Explicit min/max height
* <ol>
* <li>With explicit region</li>
* <li>With implicit S2</li>
* <li>With implicit region</li>
* </ol>
* </li>
* <li>Explicit box</li>
* <li>Explicit region</li>
* <li>Explicit sphere</li>
* <li>Implicit S2</li>
* <li>Implicit box</li>
* <li>Implicit region</li>
* </ol>
* </p>
*
* @param {ImplicitTileset} implicitTileset The implicit tileset struct which holds the root bounding volume
* @param {ImplicitTileCoordinates} implicitCoordinates The coordinates of the child tile
* @param {number} childIndex The morton index of the child tile relative to its parent
* @param {boolean} parentIsPlaceholderTile True if parentTile is a placeholder tile. This is true for the root of each subtree.
* @param {Cesium3DTile} parentTile The parent of the new child tile
* @param {object} [tileBounds] The tile bounds
* @returns {object} An object containing the JSON for a bounding volume
* @private
*/
function getTileBoundingVolume(
implicitTileset,
implicitCoordinates,
childIndex,
parentIsPlaceholderTile,
parentTile,
tileBounds,
) {
let boundingVolume;
if (
!defined(tileBounds) ||
!defined(tileBounds.boundingVolume) ||
(!canUpdateHeights(tileBounds.boundingVolume, tileBounds) &&
canUpdateHeights(implicitTileset.boundingVolume, tileBounds))
) {
boundingVolume = deriveBoundingVolume(
implicitTileset,
implicitCoordinates,
childIndex,
parentIsPlaceholderTile ?? false,
parentTile,
);
} else {
boundingVolume = tileBounds.boundingVolume;
}
// The TILE_MINIMUM_HEIGHT and TILE_MAXIMUM_HEIGHT metadata semantics
// can be used to tighten the bounding volume
updateHeights(boundingVolume, tileBounds);
return boundingVolume;
}
/**
* Gets the content bounding volume, which may be specified via
* metadata semantics such as CONTENT_BOUNDING_BOX.
* <p>
* Priority of bounding volume types:
* <ol>
* <li>Explicit min/max height
* <ol>
* <li>With explicit region</li>
* <li>With tile bounding volume (S2 or region)</li>
* </ol>
* </li>
* <li>Explicit box</li>
* <li>Explicit region</li>
* <li>Explicit sphere</li>
* <li>Tile bounding volume (when content.boundingVolume is undefined)</li>
* </ol>
* </p>
*
* @param {object} tileBoundingVolume An object containing the JSON for the tile's bounding volume
* @param {object} [contentBounds] The content bounds
* @returns {object|undefined} An object containing the JSON for a bounding volume, or <code>undefined</code> if there is no bounding volume
* @private
*/
function getContentBoundingVolume(tileBoundingVolume, contentBounds) {
// content bounding volumes can only be specified via
// metadata semantics such as CONTENT_BOUNDING_BOX
let contentBoundingVolume;
if (defined(contentBounds)) {
contentBoundingVolume = contentBounds.boundingVolume;
}
// The CONTENT_MINIMUM_HEIGHT and CONTENT_MAXIMUM_HEIGHT metadata semantics
// can be used to tighten the bounding volume
if (canUpdateHeights(contentBoundingVolume, contentBounds)) {
updateHeights(contentBoundingVolume, contentBounds);
} else if (canUpdateHeights(tileBoundingVolume, contentBounds)) {
contentBoundingVolume = clone(tileBoundingVolume, true);
updateHeights(contentBoundingVolume, contentBounds);
}
return contentBoundingVolume;
}
/**
* Given the coordinates of a tile, derive its bounding volume from the root.
*
* @param {ImplicitTileset} implicitTileset The implicit tileset struct which holds the root bounding volume
* @param {ImplicitTileCoordinates} implicitCoordinates The coordinates of the child tile
* @param {number} childIndex The morton index of the child tile relative to its parent
* @param {boolean} parentIsPlaceholderTile True if parentTile is a placeholder tile. This is true for the root of each subtree.
* @param {Cesium3DTile} parentTile The parent of the new child tile
* @returns {object} An object containing the JSON for a bounding volume
* @private
*/
function deriveBoundingVolume(
implicitTileset,
implicitCoordinates,
childIndex,
parentIsPlaceholderTile,
parentTile,
) {
const rootBoundingVolume = implicitTileset.boundingVolume;
if (hasExtension(rootBoundingVolume, "3DTILES_bounding_volume_S2")) {
return deriveBoundingVolumeS2(
parentIsPlaceholderTile,
parentTile,
childIndex,
implicitCoordinates.level,
implicitCoordinates.x,
implicitCoordinates.y,
implicitCoordinates.z,
);
}
if (defined(rootBoundingVolume.region)) {
const childRegion = deriveBoundingRegion(
rootBoundingVolume.region,
implicitCoordinates.level,
implicitCoordinates.x,
implicitCoordinates.y,
implicitCoordinates.z,
);
return {
region: childRegion,
};
}
const childBox = deriveBoundingBox(
rootBoundingVolume.box,
implicitCoordinates.level,
implicitCoordinates.x,
implicitCoordinates.y,
implicitCoordinates.z,
);
return {
box: childBox,
};
}
/**
* Derive a bounding volume for a descendant tile (child, grandchild, etc.),
* assuming a quadtree or octree implicit tiling scheme. The (level, x, y, [z])
* coordinates are given to select the descendant tile and compute its position
* and dimensions.
* <p>
* If z is present, octree subdivision is used. Otherwise, quadtree subdivision
* is used. Quadtrees are always divided at the midpoint of the the horizontal
* dimensions, i.e. (x, y), leaving the z axis unchanged.
* </p>
*
* @param {boolean} parentIsPlaceholderTile True if parentTile is a placeholder tile. This is true for the root of each subtree.
* @param {Cesium3DTile} parentTile The parent of the new child tile
* @param {number} childIndex The morton index of the child tile relative to its parent
* @param {number} level The level of the descendant tile relative to the root implicit tile
* @param {number} x The x coordinate of the descendant tile
* @param {number} y The y coordinate of the descendant tile
* @param {number} [z] The z coordinate of the descendant tile (octree only)
* @returns {object} An object with the 3DTILES_bounding_volume_S2 extension.
* @private
*/
function deriveBoundingVolumeS2(
parentIsPlaceholderTile,
parentTile,
childIndex,
level,
x,
y,
z,
) {
//>>includeStart('debug', pragmas.debug);
Check.typeOf.bool("parentIsPlaceholderTile", parentIsPlaceholderTile);
Check.typeOf.object("parentTile", parentTile);
Check.typeOf.number("childIndex", childIndex);
Check.typeOf.number("level", level);
Check.typeOf.number("x", x);
Check.typeOf.number("y", y);
if (defined(z)) {
Check.typeOf.number("z", z);
}
//>>includeEnd('debug');
const boundingVolumeS2 = parentTile._boundingVolume;
// Handle the placeholder tile case, where we just duplicate the placeholder's bounding volume.
if (parentIsPlaceholderTile) {
return {
extensions: {
"3DTILES_bounding_volume_S2": {
token: S2Cell.getTokenFromId(boundingVolumeS2.s2Cell._cellId),
minimumHeight: boundingVolumeS2.minimumHeight,
maximumHeight: boundingVolumeS2.maximumHeight,
},
},
};
}
// Extract the first 3 face bits from the 64-bit S2 cell ID.
const face = Number(parentTile._boundingVolume.s2Cell._cellId >> BigInt(61));
// The Hilbert curve is rotated for the "odd" faces on the S2 Earthcube.
// See http://s2geometry.io/devguide/img/s2cell_global.jpg
const position =
face % 2 === 0
? HilbertOrder.encode2D(level, x, y)
: HilbertOrder.encode2D(level, y, x);
const cell = S2Cell.fromFacePositionLevel(face, BigInt(position), level);
let minHeight, maxHeight;
if (defined(z)) {
const midpointHeight =
(boundingVolumeS2.maximumHeight + boundingVolumeS2.minimumHeight) / 2;
minHeight =
childIndex < 4 ? boundingVolumeS2.minimumHeight : midpointHeight;
maxHeight =
childIndex < 4 ? midpointHeight : boundingVolumeS2.maximumHeight;
} else {
minHeight = boundingVolumeS2.minimumHeight;
maxHeight = boundingVolumeS2.maximumHeight;
}
return {
extensions: {
"3DTILES_bounding_volume_S2": {
token: S2Cell.getTokenFromId(cell._cellId),
minimumHeight: minHeight,
maximumHeight: maxHeight,
},
},
};
}
const scratchScaleFactors = new Cartesian3();
const scratchRootCenter = new Cartesian3();
const scratchCenter = new Cartesian3();
const scratchHalfAxes = new Matrix3();
/**
* Derive a bounding volume for a descendant tile (child, grandchild, etc.),
* assuming a quadtree or octree implicit tiling scheme. The (level, x, y, [z])
* coordinates are given to select the descendant tile and compute its position
* and dimensions.
* <p>
* If z is present, octree subdivision is used. Otherwise, quadtree subdivision
* is used. Quadtrees are always divided at the midpoint of the the horizontal
* dimensions, i.e. (x, y), leaving the z axis unchanged.
* </p>
* <p>
* This computes the child volume directly from the root bounding volume rather
* than recursively subdividing to minimize floating point error.
* </p>
*
* @param {number[]} rootBox An array of 12 numbers representing the bounding box of the root tile
* @param {number} level The level of the descendant tile relative to the root implicit tile
* @param {number} x The x coordinate of the descendant tile
* @param {number} y The y coordinate of the descendant tile
* @param {number} [z] The z coordinate of the descendant tile (octree only)
* @returns {number[]} An array of 12 numbers representing the bounding box of the descendant tile.
* @private
*/
function deriveBoundingBox(rootBox, level, x, y, z) {
//>>includeStart('debug', pragmas.debug);
Check.typeOf.object("rootBox", rootBox);
Check.typeOf.number("level", level);
Check.typeOf.number("x", x);
Check.typeOf.number("y", y);
if (defined(z)) {
Check.typeOf.number("z", z);
}
//>>includeEnd('debug');
if (level === 0) {
return rootBox;
}
const rootCenter = Cartesian3.unpack(rootBox, 0, scratchRootCenter);
const rootHalfAxes = Matrix3.unpack(rootBox, 3, scratchHalfAxes);
const tileScale = Math.pow(2, -level);
const modelSpaceX = -1 + (2 * x + 1) * tileScale;
const modelSpaceY = -1 + (2 * y + 1) * tileScale;
let modelSpaceZ = 0;
const scaleFactors = Cartesian3.fromElements(
tileScale,
tileScale,
1,
scratchScaleFactors,
);
if (defined(z)) {
modelSpaceZ = -1 + (2 * z + 1) * tileScale;
scaleFactors.z = tileScale;
}
let center = Cartesian3.fromElements(
modelSpaceX,
modelSpaceY,
modelSpaceZ,
scratchCenter,
);
center = Matrix3.multiplyByVector(rootHalfAxes, center, scratchCenter);
center = Cartesian3.add(center, rootCenter, scratchCenter);
let halfAxes = Matrix3.clone(rootHalfAxes);
halfAxes = Matrix3.multiplyByScale(halfAxes, scaleFactors, halfAxes);
const childBox = new Array(12);
Cartesian3.pack(center, childBox);
Matrix3.pack(halfAxes, childBox, 3);
return childBox;
}
const scratchRectangle = new Rectangle();
/**
* Derive a bounding volume for a descendant tile (child, grandchild, etc.),
* assuming a quadtree or octree implicit tiling scheme. The (level, x, y, [z])
* coordinates are given to select the descendant tile and compute its position
* and dimensions.
* <p>
* If z is present, octree subdivision is used. Otherwise, quadtree subdivision
* is used. Quadtrees are always divided at the midpoint of the the horizontal
* dimensions, i.e. (mid_longitude, mid_latitude), leaving the height values
* unchanged.
* </p>
* <p>
* This computes the child volume directly from the root bounding volume rather
* than recursively subdividing to minimize floating point error.
* </p>
* @param {number[]} rootRegion An array of 6 numbers representing the root implicit tile
* @param {number} level The level of the descendant tile relative to the root implicit tile
* @param {number} x The x coordinate of the descendant tile
* @param {number} y The x coordinate of the descendant tile
* @param {number} [z] The z coordinate of the descendant tile (octree only)
* @returns {number[]} An array of 6 numbers representing the bounding region of the descendant tile
* @private
*/
function deriveBoundingRegion(rootRegion, level, x, y, z) {
//>>includeStart('debug', pragmas.debug);
Check.typeOf.object("rootRegion", rootRegion);
Check.typeOf.number("level", level);
Check.typeOf.number("x", x);
Check.typeOf.number("y", y);
if (defined(z)) {
Check.typeOf.number("z", z);
}
//>>includeEnd('debug');
if (level === 0) {
return rootRegion.slice();
}
const rectangle = Rectangle.unpack(rootRegion, 0, scratchRectangle);
const rootMinimumHeight = rootRegion[4];
const rootMaximumHeight = rootRegion[5];
const tileScale = Math.pow(2, -level);
const childWidth = tileScale * rectangle.width;
const west = CesiumMath.negativePiToPi(rectangle.west + x * childWidth);
const east = CesiumMath.negativePiToPi(west + childWidth);
const childHeight = tileScale * rectangle.height;
const south = CesiumMath.negativePiToPi(rectangle.south + y * childHeight);
const north = CesiumMath.negativePiToPi(south + childHeight);
// Height is only subdivided for octrees; It remains constant for quadtrees.
let minimumHeight = rootMinimumHeight;
let maximumHeight = rootMaximumHeight;
if (defined(z)) {
const childThickness = tileScale * (rootMaximumHeight - rootMinimumHeight);
minimumHeight += z * childThickness;
maximumHeight = minimumHeight + childThickness;
}
return [west, south, east, north, minimumHeight, maximumHeight];
}
/**
* Create a placeholder 3D Tile whose content will be an Implicit3DTileContent
* for lazy evaluation of a child subtree.
*
* @param {Implicit3DTileContent} content The content object.
* @param {Cesium3DTile} parentTile The parent of the new child subtree.
* @param {number} childIndex The morton index of the child tile relative to its parent
* @returns {Cesium3DTile} The new placeholder tile
* @private
*/
function makePlaceholderChildSubtree(content, parentTile, childIndex) {
const implicitTileset = content._implicitTileset;
const implicitCoordinates =
parentTile.implicitCoordinates.getChildCoordinates(childIndex);
const childBoundingVolume = deriveBoundingVolume(
implicitTileset,
implicitCoordinates,
childIndex,
false,
parentTile,
);
// Ignore tile metadata when computing geometric error for the placeholder tile
// since the child subtree's metadata hasn't been loaded yet.
// The actual geometric error will be computed in deriveChildTile.
const childGeometricError = getGeometricError(
undefined,
implicitTileset,
implicitCoordinates,
);
const childContentUri = implicitTileset.subtreeUriTemplate.getDerivedResource(
{
templateValues: implicitCoordinates.getTemplateValues(),
},
).url;
const tileJson = {
boundingVolume: childBoundingVolume,
geometricError: childGeometricError,
refine: implicitTileset.refine,
contents: [
{
uri: childContentUri,
},
],
};
const tile = makeTile(
content,
implicitTileset.baseResource,
tileJson,
parentTile,
);
tile.implicitTileset = implicitTileset;
tile.implicitCoordinates = implicitCoordinates;
return tile;
}
/**
* Make a {@link Cesium3DTile}. This uses the content's tile's constructor instead
* of importing Cesium3DTile. This is to avoid a circular dependency between
* this file and Cesium3DTile.js
* @param {Implicit3DTileContent} content The implicit content
* @param {Resource} baseResource The base resource for the tileset
* @param {object} tileJson The JSON header for the tile
* @param {Cesium3DTile} parentTile The parent of the new tile
* @returns {Cesium3DTile} The newly created tile.
* @private
*/
function makeTile(content, baseResource, tileJson, parentTile) {
const Cesium3DTile = content._tile.constructor;
return new Cesium3DTile(content._tileset, baseResource, tileJson, parentTile);
}
/**
* Part of the {@link Cesium3DTileContent} interface. <code>Implicit3DTileContent</code>
* always returns <code>false</code> since a tile of this type does not have any features.
* @private
*/
Implicit3DTileContent.prototype.hasProperty = function (batchId, name) {
return false;
};
/**
* Part of the {@link Cesium3DTileContent} interface. <code>Implicit3DTileContent</code>
* always returns <code>undefined</code> since a tile of this type does not have any features.
* @private
*/
Implicit3DTileContent.prototype.getFeature = function (batchId) {
return undefined;
};
Implicit3DTileContent.prototype.applyDebugSettings = function (
enabled,
color,
) {};
Implicit3DTileContent.prototype.applyStyle = function (style) {};
Implicit3DTileContent.prototype.update = function (tileset, frameState) {};
Implicit3DTileContent.prototype.pick = function (ray, frameState, result) {
return undefined;
};
Implicit3DTileContent.prototype.isDestroyed = function () {
return false;
};
Implicit3DTileContent.prototype.destroy = function () {
this._implicitSubtree =
this._implicitSubtree && this._implicitSubtree.destroy();
return destroyObject(this);
};
// Exposed for testing
Implicit3DTileContent._deriveBoundingBox = deriveBoundingBox;
Implicit3DTileContent._deriveBoundingRegion = deriveBoundingRegion;
Implicit3DTileContent._deriveBoundingVolumeS2 = deriveBoundingVolumeS2;
export default Implicit3DTileContent;
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