Lighting proposal

[PAK9]

Proposing a change to lighting - because the lighting is parallel its rare for faces to be fully lit, the result is that the original colours are typically not preserved (the pallete is obviously very limited which doesn't help). This change overbrights the lighting calculation to mantain the original colours and clamps the minimum colour to avoid flat blacks

It's an aesthetic change but I think this is closer to the original picoCAD rendering