I have made this scalpel but it has no depth. The polygon is one sided therefore but with a 2 sided material of course.
The problem however is when I render the texture the orange parts are also grey and that's how it looks on the texture. But when I apply the texture on the model I see the oranges appear right there. After baking the oranges are just like a line with the outline you see on the model and from there are stretched towards inside until where you see above.
I'm trying to figure out how I can make the edge of the scalpel look like a proper blade. Any advice please?