Why do I need to click 'render as main texture' for the material to take effect?

[roland]

PG please.

OR:

Render as main texture with code

Hi My mesh is not ideal. But I do not need any smoothness on it or effects. But it renders with black artifacts. It goes away when I toggle in inspector Material > Textures > Albedo wrench icon “Render as main texture”, And I like that. How can I apply this on mesh load to my material??