When using Decal, there is a strange shadow when Displacement is enabled.

[qingyuan_pang]

I don't know if my usage method is wrong. I only gave black and white textures to the mask and displacement.

[viktor_angelov]

Hello qingyuan_pang You should be able to do this by using the V-Ray Bump Material. Please, refer to the video recording: http://ftp.chaosgroup.com/support/sc...7_07-30-41.mp4

Also tested the Decal Displacement option and it seems to work as expected: http://ftp.chaosgroup.com/support/sc...7_07-35-36.jpg

If this does not work for you, please, send us the scene so can investigate further.

[sirio76]

I don't know if my usage method is wrong. I only gave black and white textures to the mask and displacement.

Is possible that displacement settings are not ideal to produce enough subdivisions on the surface, try to pre-subdivide the mesh in square of 10x10cm, maybe rise the edge length to 2 or 1 to get more detail.