By using sculpt brush and smooth brush in voxel mode
Artifacts have appeared on the surface of the object.
Unnatural patterns are recognized even in surface mode.
Please check pic and video.
https://1drv.ms/u/s!AkLv9Kt8XCebgTv7VKh3fgSFdLGJ?e=wnaqPH
https://1drv.ms/v/s!AkLv9Kt8XCebgTk_4oHlivzBsKY8?e=tgkVbE
I also uploaded the 3b file.
https://1drv.ms/u/s!AkLv9Kt8XCebgTqggqS1laADO7Bq?e=FfgB9O
I used 4.8.20 normally,
I remember that artifacts began to occur after installing 4.9.12.
After confirming the symptoms, I reinstalled all 3d-coat applications.
I tried DX and GL versions 4.7.37, 4.8.20 and 4.9.12 respectively, but the results were the same.
The video card driver has also been updated to the latest version. (GeForce Game Ready Driver 441.66)
os - windows10 64bit
cpu - intel core i7-8700 3.20GHz
memory - 16GB RAM DDR4
motherbord - TUF H370-PRO GAMING
video card - Nvidia GeForce GTX 1050 Ti
These sentences were translated by google automatic translation.