Cesium-Prequel/Specs/Scene/TileOrientedBoundingBoxSpec.js

import { Cartesian3 } from "../../Source/Cesium.js";
import { Color } from "../../Source/Cesium.js";
import { Intersect } from "../../Source/Cesium.js";
import { Math as CesiumMath } from "../../Source/Cesium.js";
import { Matrix3 } from "../../Source/Cesium.js";
import { Plane } from "../../Source/Cesium.js";
import { TileOrientedBoundingBox } from "../../Source/Cesium.js";
import createFrameState from "../createFrameState.js";

describe("Scene/TileOrientedBoundingBox", function () {
  var center = new Cartesian3(0.0, 0.0, 0.0);
  var halfAxes = Matrix3.fromScale(
    new Cartesian3(0.5, 0.5, 0.5),
    new Matrix3()
  );
  var tileBoundingVolume = new TileOrientedBoundingBox(center, halfAxes);

  var frameState = createFrameState();

  it("can be instantiated with center and half-axes", function () {
    expect(tileBoundingVolume.boundingVolume.center).toEqual(center);
    expect(tileBoundingVolume.boundingVolume.halfAxes).toEqual(halfAxes);
    expect(tileBoundingVolume.boundingSphere.center).toEqual(center);
    expect(tileBoundingVolume.boundingSphere.radius).toBeGreaterThan(0.5);
    expect(tileBoundingVolume.boundingSphere.radius).toBeLessThan(1.0);
  });

  it("createDebugVolume throws when color is undefined", function () {
    expect(function () {
      return tileBoundingVolume.createDebugVolume();
    }).toThrowDeveloperError();
  });

  it("can create debug volume", function () {
    expect(tileBoundingVolume.createDebugVolume(Color.BLUE)).toBeDefined();
  });

  it("distanceToCamera throws when frameState is undefined", function () {
    expect(function () {
      return tileBoundingVolume.distanceToCamera();
    }).toThrowDeveloperError();
  });

  it("has distance 0 to camera if camera is inside", function () {
    frameState.camera.position = new Cartesian3(0.0, 0.0, 0.0);
    expect(tileBoundingVolume.distanceToCamera(frameState)).toEqual(0.0);

    frameState.camera.position = new Cartesian3(-0.5, -0.5, -0.5);
    expect(tileBoundingVolume.distanceToCamera(frameState)).toEqual(0.0);
    frameState.camera.position = new Cartesian3(0.5, 0.5, 0.5);
    expect(tileBoundingVolume.distanceToCamera(frameState)).toEqual(0.0);
  });

  it("has correct distance to camera if camera is slightly outside box", function () {
    var eps6 = CesiumMath.EPSILON6;
    frameState.camera.position = new Cartesian3(0.5 + eps6, 0.5, 0.5);
    expect(tileBoundingVolume.distanceToCamera(frameState)).not.toEqual(0.0);
    frameState.camera.position = new Cartesian3(-0.5, -0.5, -0.5 - eps6);
    expect(tileBoundingVolume.distanceToCamera(frameState)).not.toEqual(0.0);
    frameState.camera.position = new Cartesian3(100.5, 100.5, 100.5);
    expect(tileBoundingVolume.distanceToCamera(frameState)).toEqual(
      Math.sqrt(30000.0)
    );
  });

  it("has correct distance to camera for large distances", function () {
    frameState.camera.position = new Cartesian3(
      2170456.713380141,
      -36351235.19646463,
      28403328.27058654
    );
    expect(tileBoundingVolume.distanceToCamera(frameState)).toEqualEpsilon(
      46183029.05370139,
      CesiumMath.EPSILON6
    );
  });

  it("intersectPlane throws when plane is undefined", function () {
    expect(function () {
      return tileBoundingVolume.intersectPlane();
    }).toThrowDeveloperError();
  });

  it("intersects plane", function () {
    var plane = new Plane(Cartesian3.UNIT_X, 0.0);
    expect(tileBoundingVolume.intersectPlane(plane)).toEqual(
      Intersect.INTERSECTING
    );
    plane = new Plane(Cartesian3.UNIT_X, 0.5 - CesiumMath.EPSILON6);
    expect(tileBoundingVolume.intersectPlane(plane)).toEqual(
      Intersect.INTERSECTING
    );
    plane = new Plane(Cartesian3.UNIT_X, -0.5 + CesiumMath.EPSILON6);
    expect(tileBoundingVolume.intersectPlane(plane)).toEqual(
      Intersect.INTERSECTING
    );
  });

  it("does not intersect plane", function () {
    var eps6 = CesiumMath.EPSILON6;
    var plane = new Plane(Cartesian3.UNIT_X, 0.5 + eps6);
    expect(tileBoundingVolume.intersectPlane(plane)).toEqual(Intersect.INSIDE);
    plane = new Plane(Cartesian3.UNIT_Y, 0.5 + eps6);
    expect(tileBoundingVolume.intersectPlane(plane)).toEqual(Intersect.INSIDE);
    plane = new Plane(Cartesian3.UNIT_Z, 0.5 + eps6);
    expect(tileBoundingVolume.intersectPlane(plane)).toEqual(Intersect.INSIDE);

    plane = new Plane(Cartesian3.UNIT_X, -0.5 - eps6);
    expect(tileBoundingVolume.intersectPlane(plane)).toEqual(Intersect.OUTSIDE);
    plane = new Plane(Cartesian3.UNIT_Y, -0.5 - eps6);
    expect(tileBoundingVolume.intersectPlane(plane)).toEqual(Intersect.OUTSIDE);
    plane = new Plane(Cartesian3.UNIT_Z, -0.5 - eps6);
    expect(tileBoundingVolume.intersectPlane(plane)).toEqual(Intersect.OUTSIDE);
  });
});