function updateModelMatrix2D(drawCommand, frameState) {
  const modelMatrix = drawCommand._modelMatrix;
  drawCommand._modelMatrix2D = Matrix4.clone(
    modelMatrix,
    drawCommand._modelMatrix2D,
  );

  // Change the translation's y-component so it appears on the opposite side
  // of the map.
  drawCommand._modelMatrix2D[13] -=
    CesiumMath.sign(modelMatrix[13]) *
    2.0 *
    CesiumMath.PI *
    frameState.mapProjection.ellipsoid.maximumRadius;

  drawCommand._boundingVolume2D = BoundingSphere.transform(
    drawCommand.runtimePrimitive.boundingSphere,
    drawCommand._modelMatrix2D,
    drawCommand._boundingVolume2D,
  );
}
Whether to draw the bounding sphere associated with this draw command.

@memberof ModelDrawCommand.prototype
@type {boolean}

@private