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import BoxOutlineGeometry from "../Core/BoxOutlineGeometry.js";
import Cartesian3 from "../Core/Cartesian3.js";
import Check from "../Core/Check.js";
import ColorGeometryInstanceAttribute from "../Core/ColorGeometryInstanceAttribute.js";
import GeometryInstance from "../Core/GeometryInstance.js";
import Matrix3 from "../Core/Matrix3.js";
import Matrix4 from "../Core/Matrix4.js";
import CesiumMath from "../Core/Math.js";
import OrientedBoundingBox from "../Core/OrientedBoundingBox.js";
import PerInstanceColorAppearance from "./PerInstanceColorAppearance.js";
import Primitive from "./Primitive.js";
const scratchU = new Cartesian3();
const scratchV = new Cartesian3();
const scratchW = new Cartesian3();
const scratchCartesian = new Cartesian3();
function computeMissingVector(a, b, result) {
result = Cartesian3.cross(a, b, result);
const magnitude = Cartesian3.magnitude(result);
return Cartesian3.multiplyByScalar(
result,
CesiumMath.EPSILON7 / magnitude,
result,
);
}
function findOrthogonalVector(a, result) {
const temp = Cartesian3.normalize(a, scratchCartesian);
const b = Cartesian3.equalsEpsilon(
temp,
Cartesian3.UNIT_X,
CesiumMath.EPSILON6,
)
? Cartesian3.UNIT_Y
: Cartesian3.UNIT_X;
return computeMissingVector(a, b, result);
}
function checkHalfAxes(halfAxes) {
let u = Matrix3.getColumn(halfAxes, 0, scratchU);
let v = Matrix3.getColumn(halfAxes, 1, scratchV);
let w = Matrix3.getColumn(halfAxes, 2, scratchW);
const uZero = Cartesian3.equals(u, Cartesian3.ZERO);
const vZero = Cartesian3.equals(v, Cartesian3.ZERO);
const wZero = Cartesian3.equals(w, Cartesian3.ZERO);
if (!uZero && !vZero && !wZero) {
return halfAxes;
}
if (uZero && vZero && wZero) {
halfAxes[0] = CesiumMath.EPSILON7;
halfAxes[4] = CesiumMath.EPSILON7;
halfAxes[8] = CesiumMath.EPSILON7;
return halfAxes;
}
if (uZero && !vZero && !wZero) {
u = computeMissingVector(v, w, u);
} else if (!uZero && vZero && !wZero) {
v = computeMissingVector(u, w, v);
} else if (!uZero && !vZero && wZero) {
w = computeMissingVector(v, u, w);
} else if (!uZero) {
v = findOrthogonalVector(u, v);
w = computeMissingVector(v, u, w);
} else if (!vZero) {
u = findOrthogonalVector(v, u);
w = computeMissingVector(v, u, w);
} else Eif (!wZero) {
u = findOrthogonalVector(w, u);
v = computeMissingVector(w, u, v);
}
Matrix3.setColumn(halfAxes, 0, u, halfAxes);
Matrix3.setColumn(halfAxes, 1, v, halfAxes);
Matrix3.setColumn(halfAxes, 2, w, halfAxes);
return halfAxes;
}
/**
* A tile bounding volume specified as an oriented bounding box.
* @alias TileOrientedBoundingBox
* @constructor
*
* @param {Cartesian3} [center=Cartesian3.ZERO] The center of the box.
* @param {Matrix3} [halfAxes=Matrix3.ZERO] The three orthogonal half-axes of the bounding box.
* Equivalently, the transformation matrix, to rotate and scale a 2x2x2
* cube centered at the origin.
*
* @private
*/
function TileOrientedBoundingBox(center, halfAxes) {
halfAxes = checkHalfAxes(halfAxes);
this._orientedBoundingBox = new OrientedBoundingBox(center, halfAxes);
this._boundingSphere = BoundingSphere.fromOrientedBoundingBox(
this._orientedBoundingBox,
);
}
Object.defineProperties(TileOrientedBoundingBox.prototype, {
/**
* The underlying bounding volume.
*
* @memberof TileOrientedBoundingBox.prototype
*
* @type {OrientedBoundingBox}
* @readonly
*/
boundingVolume: {
get: function () {
return this._orientedBoundingBox;
},
},
/**
* The underlying bounding sphere.
*
* @memberof TileOrientedBoundingBox.prototype
*
* @type {BoundingSphere}
* @readonly
*/
boundingSphere: {
get: function () {
return this._boundingSphere;
},
},
});
/**
* Computes the distance between this bounding box and the camera attached to frameState.
*
* @param {FrameState} frameState The frameState to which the camera is attached.
* @returns {number} The distance between the camera and the bounding box in meters. Returns 0 if the camera is inside the bounding volume.
*/
TileOrientedBoundingBox.prototype.distanceToCamera = function (frameState) {
//>>includeStart('debug', pragmas.debug);
Check.defined("frameState", frameState);
//>>includeEnd('debug');
return Math.sqrt(
this._orientedBoundingBox.distanceSquaredTo(frameState.camera.positionWC),
);
};
/**
* Determines which side of a plane this box is located.
*
* @param {Plane} plane The plane to test against.
* @returns {Intersect} {@link Intersect.INSIDE} if the entire box is on the side of the plane
* the normal is pointing, {@link Intersect.OUTSIDE} if the entire box is
* on the opposite side, and {@link Intersect.INTERSECTING} if the box
* intersects the plane.
*/
TileOrientedBoundingBox.prototype.intersectPlane = function (plane) {
//>>includeStart('debug', pragmas.debug);
Check.defined("plane", plane);
//>>includeEnd('debug');
return this._orientedBoundingBox.intersectPlane(plane);
};
/**
* Update the bounding box after the tile is transformed.
*
* @param {Cartesian3} center The center of the box.
* @param {Matrix3} halfAxes The three orthogonal half-axes of the bounding box.
* Equivalently, the transformation matrix, to rotate and scale a 2x2x2
* cube centered at the origin.
*/
TileOrientedBoundingBox.prototype.update = function (center, halfAxes) {
Cartesian3.clone(center, this._orientedBoundingBox.center);
halfAxes = checkHalfAxes(halfAxes);
Matrix3.clone(halfAxes, this._orientedBoundingBox.halfAxes);
BoundingSphere.fromOrientedBoundingBox(
this._orientedBoundingBox,
this._boundingSphere,
);
};
/**
* Creates a debug primitive that shows the outline of the box.
*
* @param {Color} color The desired color of the primitive's mesh
* @return {Primitive}
*/
TileOrientedBoundingBox.prototype.createDebugVolume = function (color) {
//>>includeStart('debug', pragmas.debug);
Check.defined("color", color);
//>>includeEnd('debug');
const geometry = new BoxOutlineGeometry({
// Make a 2x2x2 cube
minimum: new Cartesian3(-1.0, -1.0, -1.0),
maximum: new Cartesian3(1.0, 1.0, 1.0),
});
const modelMatrix = Matrix4.fromRotationTranslation(
this.boundingVolume.halfAxes,
this.boundingVolume.center,
);
const instance = new GeometryInstance({
geometry: geometry,
id: "outline",
modelMatrix: modelMatrix,
attributes: {
color: ColorGeometryInstanceAttribute.fromColor(color),
},
});
return new Primitive({
geometryInstances: instance,
appearance: new PerInstanceColorAppearance({
translucent: false,
flat: true,
}),
asynchronous: false,
});
};
export default TileOrientedBoundingBox;
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