Vertex Normal Tool 1.0.5 For Cinema 4d ((install)) -

Precisely rotate or set the direction of normals to achieve specific shading effects or fix errors on complex geometries.

The tool can automatically add a new Normal Tag to an object while preserving existing bevels or edge breaks. Why Professionals Use VNT 1.0.5 Vertex Normal Tool 1.0.5 for Cinema 4D

You can "steal" or target the normals from another mesh, which is highly effective for removing lighting seams between separate objects. Precisely rotate or set the direction of normals