Materials Suddenly Disappear and Incorrect after Render

[lakir23180]

**D5 Render Version: 2.7.1.0465
**Graphics Card: NVIDIA Quadro RTX 4000
**Driver Version: 31.0.15.5161
**Issue Description: Initial Renders were good. Materials all display correctly. But once render completed, brass metal became black out of a sudden. Previous applied materials totally change. Even though material picker states its brass iron, but what is reflected in D5 does not tally.
**Screenshots/Videos Description:
Original Image

After Render, the scene totally change

This is from D5 Library, but it displays differently on scene

[nicofirmansyah1]

try to use realtime mode

[LunaLang]

Hello. Is it only in the preview that the Brushed Aluminium Alloy material turns black or is this material also black in the rendered image?
If the material is only blackened in the preview, please check whether the realtime quality in the display panel is selected as smooth or precise. This material will look darkened in smooth mode.

[lakir23180]

Thank you all. Turns out its the realtime mode settings. thank you!