ID 428171 - The Bump does not influence Specular when used with the Principal BRDF shader.

Problem summary
The Bump does not influence Specular when used with the Principal BRDF shader.

Customer reported version
mari.4.5v2

Customer reported platform

Steps to reproduce

1) In Mari, open the Example Head project.

2) Open the Lights panel and disable the Environment lighting. (Leave Light1 enabled)

2) Add a Cloud node to the Bump of the Principled BRDF shader.

3) Adjust settings for the Bump Weight value for 1.

4) Set the Specular Roughness value for .3 and view the model.

Expected behavior
The Specular input should be affected by the Bump.

Actual behavior
The Specular is not affected by the Bump when using the Principal BRDF shader.

Workaround
There is no available workaround at this time.

Reproduced by Support in

Mari 4.6v2 - Windows 10

Mari 4.6v1 - Windows 10

Mari 4.5v2 - Windows 10

Mari 4.5v1 - Windows 10

Earliest version tested
Mari 4.5v1 -This feature did not exist before this version