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It's impossible not to use 3d shader nowadays in games, especially if you use lighting in the game as in your case, amigo.Na unity is already connected if you want to check it, go to edit >> project settings.

Here's a story to better clarify for you what a shader is. Hope this helps. ^^

https://www.tecmundo.com.br/voxel/especiais/182970-shaders-o-que-sao-e-para-que-...