Toon Shader Perspective Issue

[ack2v]

Hello all,

I want to create a mask from the outlines of my geometry for post-production. I attached a simplified scene - since I only want the outlines I didn't add any toon lights. When looking at the side perspective A everything looks as desired, but when moving the perspective to a top-down B the bottom part turns white. What am I missing, is this working as intended? If yes, what would would be the best way to achieve the look A from all perspectives.

I tried several setups with toon lights, different colors and material settings using latest octane version with C4D 2024.2.0

Thanks!