When the roughness is set to 0, the reflection can not be displayed properly.

Development Rendering
, , , ,
1

I used

278079-img20190527-174613.png
278079-img20190527-174613.png879×637 538 KB

to make a water-depression material.When the roughness is set to 0, the reflection can not be displayed properly.Reflections at a particular angle will show up incorrectly.