Unsupported feature render Grey in stead of black

[Sbrusse]

All in the title.

Would it be possible o have unsupported features rendering grey in stead of black.
When I tweak lighting, I have currently black mtl and it's really hard to asses how light behaves on black, so would be great if it could render out grey in stead, or at least put a checkbox to over ride unsupported features mtl to a specific one.

Thanks

[vlado]

Hm, maybe. What kind of feature is it in this particular instance?

Best regards,
Vlado

[Sbrusse]

The Viz Park CrossMap and Walls&Tiles.

Alternatively, I would love to have those supported, and in GPU would be even better