粒子火焰

function addFire() {
  const particle = new Cesium.ParticleSystem({
    image: FireImage,
    startColor: Cesium.Color.RED.withAlpha(0.1),
    endColor: Cesium.Color.YELLOW.withAlpha(0.5),
    startScale: 10,
    endScale: 5,
    minimumParticleLife: 50,
    maximumParticleLife: 100,
    minimumSpeed: 20,
    maximumSpeed: 30,
    imageSize: new Cesium.Cartesian2(1, 1),
    sizeInMeters: true,
    // Particles per second.
    emissionRate: 100,
    // lifetime: 60.0,
    emitter: new Cesium.CircleEmitter(10.0),
    modelMatrix: computeModelMatrix({lon: 116.45, lat: 39.932, alt: 4}),
    emitterModelMatrix: computeEmitterModelMatrix(),
    updateCallback: applyGravity
  })

  viewer.value.scene.primitives.add(particle);
  viewer.value.camera.setView({
    destination: Cesium.Cartesian3.fromDegrees(116.45, 39.932, 3000)
  })
}