ID 474154 - The Falloff Curve node has no effect

Problem summary
The Falloff Curve node has no effect

Customer reported version
Mari 4.7v2

Customer reported platform
Windows 10

Steps to reproduce

1) Open an Example 'Head' Project

2) Create a Falloff Curve node and connect it to the Viewer

Expected behaviour
A falloff gradient effect should be visible on the Sphere.obj mesh

Actual behaviour

The Sphere.obj mesh has a constant white colour

NOTE: If the mesh normals are inverted, the Falloff Curve node produces the desired effect.
 

This can be reproduced with the attached 'ExampleHead_InvertedNormals.obj' mesh.

Workaround

 

2. Connect it to a Shuffle node. Set each of the RGB channels to 'b'

​

 

3. Invert the output of the Shuffle node with an Invert node

 

4. Connect a Brightness Lookup node for ramp control over the gradient

 

Reproduced by support

This bug has been reproduced in:
Mari 4.7v2 - Windows 10 - CentOS 7.7

Mari 4.7v1 - Windows 10 

Mari 4.6v4 - Windows 10 - CentOS 7.7 - regression

Unable to reproduce bug in: 

Mari 4.6v3 - Windows 10 - CentOS 7.7

Earliest version tested
Mari 4.6v3 - This issue doesn't appear in this version and has regressed