Use bloom effect lost depth

Questions
1

Rendering a large building map scene, some of the buildings are luminous, I like to use bloom effect, but if you follow Demo: https://threejs.org/examples/webgl_postprocessing_unreal_bloom_selective then the rendering efficiency is too poor, and need to render all the buildings twice, is there any way to get the depth value of the highlighted building

chinese original：
渲染一个大的建筑物地图场景，其中部分楼是发光的，我像使用bloom effect , 但是如果按照 demo: https://threejs.org/examples/?q=post#webgl_postprocessing_unreal_bloom_selective ，那么渲染效率就太差了，需要把所有的建筑物都渲染两次，有没有办法获得高亮楼的深度值

2

I know little about bloom effect. But if you want to get depth map of a certain object, maybe you can render the one object with MeshDepthMaterial rather than render the whole scene.